Nos Abonnements
Ressources Électroniques
|
[n° ou bulletin]
[n° ou bulletin]
Vol. 51 N° 9 - Mars 2012 [texte imprimé] . - 2012 . - p. 3525-3850 : ill. ; 28 cm. Chemical engineering Langues : Anglais (eng)
|
Exemplaires
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| aucun exemplaire | |||||
|
Dépouillements
Ajouter le résultat dans votre panierVariables affecting biodiesel production from zanthoxylum bungeanum seed oil with high free fatty acids / Junhua Zhang in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012)
Titre : Variables affecting biodiesel production from zanthoxylum bungeanum seed oil with high free fatty acids Type de document : texte imprimé Auteurs : Junhua Zhang, Auteur ; Lei Zhang, Auteur ; Lili Jia, Auteur Année de publication : 2012 Article en page(s) : pp. 3525-3530 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production Biodiesel Résumé : The Zanthoxylum bungeanum seed oil (ZSO) having high free fatty acids was successfully transformed into biodiesel by acid-catalyzed esterification and alkali-catalyzed transesterification and high conversion to biodiesel was obtained in a short time compared to acid-catalyzed transesterification. Methanol-to-oil molar ratio, catalyst amount, and reaction time were found to clearly affect the ferric sulfate-catalyzed esterification of ZSO. The acid value of ZSO was reduced to less than 2 mg of KOH/g with a methanol-to-oil molar ratio of 16:1, catalyst amount of 2%, and reaction time of 3 h, following transesterification using an alkaline catalyst. The conversion to biodiesel by potassium hydroxide-catalyzed transesterification was achieved above 98% under optimum conditions: a methanol-to-oil molar ratio of 6:1, catalyst amount of 1.5%, reaction time of 60 min, and reaction temperature of 60 °C. The biodiesel production process was also confirmed by 1H NMR and FTIR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200306w
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3525-3530[article] Variables affecting biodiesel production from zanthoxylum bungeanum seed oil with high free fatty acids [texte imprimé] / Junhua Zhang, Auteur ; Lei Zhang, Auteur ; Lili Jia, Auteur . - 2012 . - pp. 3525-3530.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3525-3530
Mots-clés : Production Biodiesel Résumé : The Zanthoxylum bungeanum seed oil (ZSO) having high free fatty acids was successfully transformed into biodiesel by acid-catalyzed esterification and alkali-catalyzed transesterification and high conversion to biodiesel was obtained in a short time compared to acid-catalyzed transesterification. Methanol-to-oil molar ratio, catalyst amount, and reaction time were found to clearly affect the ferric sulfate-catalyzed esterification of ZSO. The acid value of ZSO was reduced to less than 2 mg of KOH/g with a methanol-to-oil molar ratio of 16:1, catalyst amount of 2%, and reaction time of 3 h, following transesterification using an alkaline catalyst. The conversion to biodiesel by potassium hydroxide-catalyzed transesterification was achieved above 98% under optimum conditions: a methanol-to-oil molar ratio of 6:1, catalyst amount of 1.5%, reaction time of 60 min, and reaction temperature of 60 °C. The biodiesel production process was also confirmed by 1H NMR and FTIR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200306w Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Structure – thermomechanical property correlations of highly branched siloxane – urethane networks Type de document : texte imprimé Auteurs : Someshwarnath Pandey, Auteur ; Sangram K. Rath, Auteur ; Asit. B. Samui, Auteur Année de publication : 2012 Article en page(s) : pp. 3531-3540 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Correlation analysis Thermomechanical properties Résumé : A series of B3 core-terminated highly branched siloxane―urethane polymers was synthesized through the A2 + B3 route. Isophorone diisocyanate (IPDI)-terminated polydimethylsiloxane (PDMS) was used as the A2 unit and triethanol amine as the B3 core. Size exclusion chromatography (SEC) studies revealed decreasing number-average molecular weights for the branched polymers and increasing tendency toward lower molecular weight species formation with increased proportion of B3 core in the branched polymers. The degree of branching and fraction of dendritic units, evaluated from 1H NMR, increased monotonically with increasing B3 core in the branched polymers. Cross-linked networks of the highly branched polymers were prepared by reaction of the terminal hydroxyl groups with tetraethoxysilane (TEOS) at room temperature. The sol fractions obtained for the networks from solvent extraction studies were consistent with the non-network-forming low molecular weight fractions obtained from the deconvoluted SEC traces. The solubility parameter, Flory―Huggins interaction parameter, and cross-link density of the networks were evaluated from swelling studies. FTIR spectroscopy was used to evaluate the degree of hydrogen bonding of the branched networks. The thermomechanical properties of the networks were evaluated by stress-strain measurements and dynamic mechanical analysis, and the results were correlated with the structural parameters, such as degree of branching, extent of hydrogen bonding, and cross-link density. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595777
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3531-3540[article] Structure – thermomechanical property correlations of highly branched siloxane – urethane networks [texte imprimé] / Someshwarnath Pandey, Auteur ; Sangram K. Rath, Auteur ; Asit. B. Samui, Auteur . - 2012 . - pp. 3531-3540.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3531-3540
Mots-clés : Correlation analysis Thermomechanical properties Résumé : A series of B3 core-terminated highly branched siloxane―urethane polymers was synthesized through the A2 + B3 route. Isophorone diisocyanate (IPDI)-terminated polydimethylsiloxane (PDMS) was used as the A2 unit and triethanol amine as the B3 core. Size exclusion chromatography (SEC) studies revealed decreasing number-average molecular weights for the branched polymers and increasing tendency toward lower molecular weight species formation with increased proportion of B3 core in the branched polymers. The degree of branching and fraction of dendritic units, evaluated from 1H NMR, increased monotonically with increasing B3 core in the branched polymers. Cross-linked networks of the highly branched polymers were prepared by reaction of the terminal hydroxyl groups with tetraethoxysilane (TEOS) at room temperature. The sol fractions obtained for the networks from solvent extraction studies were consistent with the non-network-forming low molecular weight fractions obtained from the deconvoluted SEC traces. The solubility parameter, Flory―Huggins interaction parameter, and cross-link density of the networks were evaluated from swelling studies. FTIR spectroscopy was used to evaluate the degree of hydrogen bonding of the branched networks. The thermomechanical properties of the networks were evaluated by stress-strain measurements and dynamic mechanical analysis, and the results were correlated with the structural parameters, such as degree of branching, extent of hydrogen bonding, and cross-link density. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595777 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Isothermal thermogravimetric analysis of soybean oil oxidation correlated to thin film micro - oxidation test methods Type de document : texte imprimé Auteurs : Mert Arca, Auteur ; Brajendra K. Sharma, Auteur ; Joseph M. Perez, Auteur Année de publication : 2012 Article en page(s) : pp. 3550-3555 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Test method Thin film Oxidation Thermogravimetry Résumé : An isothermal thermogravimetric analysis (TGA) method was used to generate a model capable of predicting the results of the Thin Film Micro-Oxidation (TFMO) test in a soybean oil system. Utilizing a series of pseudorate constants and "activation energies", weight loss data from the TGA method can predict oxidation, polymerization, evaporation, and the formation of high molecular weight deposits, normally observed in the TFMO test. These parameters can be used in simple computer simulations which can calculate the weight of each component of a lubricant as it decomposes. This allows evaluation of lubricants without the difficult to obtain TFMO equipment, instead utilizing equipment available in most laboratories. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595779
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3550-3555[article] Isothermal thermogravimetric analysis of soybean oil oxidation correlated to thin film micro - oxidation test methods [texte imprimé] / Mert Arca, Auteur ; Brajendra K. Sharma, Auteur ; Joseph M. Perez, Auteur . - 2012 . - pp. 3550-3555.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3550-3555
Mots-clés : Test method Thin film Oxidation Thermogravimetry Résumé : An isothermal thermogravimetric analysis (TGA) method was used to generate a model capable of predicting the results of the Thin Film Micro-Oxidation (TFMO) test in a soybean oil system. Utilizing a series of pseudorate constants and "activation energies", weight loss data from the TGA method can predict oxidation, polymerization, evaporation, and the formation of high molecular weight deposits, normally observed in the TFMO test. These parameters can be used in simple computer simulations which can calculate the weight of each component of a lubricant as it decomposes. This allows evaluation of lubricants without the difficult to obtain TFMO equipment, instead utilizing equipment available in most laboratories. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595779 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Coimmobilization of detergent enzymes onto a plastic bucket and brush for their application in cloth washing Type de document : texte imprimé Auteurs : C. S. Pundir, Auteur ; Nidhi Chauhan, Auteur Année de publication : 2012 Article en page(s) : pp. 3556–3563 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Detergent enzymes Résumé : A mixture of detergent enzymes, α-amylase, cellulase, protease, and lipase has been coimmobilized covalently onto an inner wall of a plastic beaker and bristles of a plastic brush. The coimmobilized α-amylase, cellulase, protease, and lipase retained 66.7, 54.2, 44.64, and 62.8% on the beaker and 44.01, 66.23, 33.9, and 45.8% on the brush of their initial activity in free/native form. The conjugation yield of the enzymes/proteins onto beaker and brush was 0.02 mg/cm2 and 0.016 mg/cm2, respectively. The scanning electron micrographs (SEM) and Fourier transform infrared (FTIR) spectra of PVC sheet surfaces before and after coimmobilization of enzymes confirmed their coimmobilization. There were slight changes in optimal pH, incubation temperature and time for maximum activity and Km of enzymes after immobilization. The combination of any nonenzymic (cheaper) detergent and immobilized enzymes gave equal/better washing of cotton cloths than that by enzymic detergent (costly) in distilled water. Similar results were obtained with other types of water. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202053r
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3556–3563[article] Coimmobilization of detergent enzymes onto a plastic bucket and brush for their application in cloth washing [texte imprimé] / C. S. Pundir, Auteur ; Nidhi Chauhan, Auteur . - 2012 . - pp. 3556–3563.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3556–3563
Mots-clés : Detergent enzymes Résumé : A mixture of detergent enzymes, α-amylase, cellulase, protease, and lipase has been coimmobilized covalently onto an inner wall of a plastic beaker and bristles of a plastic brush. The coimmobilized α-amylase, cellulase, protease, and lipase retained 66.7, 54.2, 44.64, and 62.8% on the beaker and 44.01, 66.23, 33.9, and 45.8% on the brush of their initial activity in free/native form. The conjugation yield of the enzymes/proteins onto beaker and brush was 0.02 mg/cm2 and 0.016 mg/cm2, respectively. The scanning electron micrographs (SEM) and Fourier transform infrared (FTIR) spectra of PVC sheet surfaces before and after coimmobilization of enzymes confirmed their coimmobilization. There were slight changes in optimal pH, incubation temperature and time for maximum activity and Km of enzymes after immobilization. The combination of any nonenzymic (cheaper) detergent and immobilized enzymes gave equal/better washing of cotton cloths than that by enzymic detergent (costly) in distilled water. Similar results were obtained with other types of water. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202053r Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Synthesis of succinic acid alkyl half - ester derivatives with improved lubricity characteristics Type de document : texte imprimé Auteurs : Seung-Yeob Baek, Auteur ; Young-Wun Kim, Auteur ; Keunwoo Chung, Auteur Année de publication : 2012 Article en page(s) : pp. 3564–3568 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Succinic acid Lubricating properties Résumé : A series of succinic acid alkyl half-esters were synthesized with higher than 97% yields by a one-step reaction of succinic anhydride with various fatty alcohols. The synthesized esters were soluble in 100N base oil at 1 wt %, and the lubricating properties of the esters in ultralow-sulfur diesel fuel were measured using a high-frequency reciprocating test rig and a four-ball wear machine. Wear scar diameter results showed that lubricity depended on the presence of a carboxylic acid group and that enhancements to lubricity depended strongly on the chain lengths of the alkyl group. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202137r
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3564–3568[article] Synthesis of succinic acid alkyl half - ester derivatives with improved lubricity characteristics [texte imprimé] / Seung-Yeob Baek, Auteur ; Young-Wun Kim, Auteur ; Keunwoo Chung, Auteur . - 2012 . - pp. 3564–3568.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3564–3568
Mots-clés : Succinic acid Lubricating properties Résumé : A series of succinic acid alkyl half-esters were synthesized with higher than 97% yields by a one-step reaction of succinic anhydride with various fatty alcohols. The synthesized esters were soluble in 100N base oil at 1 wt %, and the lubricating properties of the esters in ultralow-sulfur diesel fuel were measured using a high-frequency reciprocating test rig and a four-ball wear machine. Wear scar diameter results showed that lubricity depended on the presence of a carboxylic acid group and that enhancements to lubricity depended strongly on the chain lengths of the alkyl group. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202137r Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Sol – gel synthesis of red - emitting phosphor Ca – Sr – Mo – W – O – (Eu 3 +, La3 +) powders and luminescence properties Type de document : texte imprimé Auteurs : Fa-Bin Cao, Auteur Année de publication : 2012 Article en page(s) : pp. 3569-3574 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Powder Résumé : The object of this study is to synthesize (Ca0.6,Sr0.16)(Mo0.4,W0.6):Eu3+0.08,La3+0.08 by sol―gel technology. The results show that the dominant emission peak of phosphor is 3D0 → 7F2 (616 nm). The International Commission on Illumination (CIE) chromaticity coordinates of the red-emitting phosphor are (0.67, 0.33), which is the NTSC system standard for red chromaticity. Because there are two regions in the excitation spectra of the phosphor, one is assigned from the charge transfer state (CTS) band at about 200―350 nm, and the other is from the intra-4f transitions from 350 to 600 nm. Hence, the phosphors could be strongly excited by near-UV and blue LEDs in solid state lighting technology. X-ray diffraction patterns indicated that red-phosphor powders present a tetragonal structure, I41/a[88](Z = 4) space group. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595782
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3569-3574[article] Sol – gel synthesis of red - emitting phosphor Ca – Sr – Mo – W – O – (Eu 3 +, La3 +) powders and luminescence properties [texte imprimé] / Fa-Bin Cao, Auteur . - 2012 . - pp. 3569-3574.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3569-3574
Mots-clés : Powder Résumé : The object of this study is to synthesize (Ca0.6,Sr0.16)(Mo0.4,W0.6):Eu3+0.08,La3+0.08 by sol―gel technology. The results show that the dominant emission peak of phosphor is 3D0 → 7F2 (616 nm). The International Commission on Illumination (CIE) chromaticity coordinates of the red-emitting phosphor are (0.67, 0.33), which is the NTSC system standard for red chromaticity. Because there are two regions in the excitation spectra of the phosphor, one is assigned from the charge transfer state (CTS) band at about 200―350 nm, and the other is from the intra-4f transitions from 350 to 600 nm. Hence, the phosphors could be strongly excited by near-UV and blue LEDs in solid state lighting technology. X-ray diffraction patterns indicated that red-phosphor powders present a tetragonal structure, I41/a[88](Z = 4) space group. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595782 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : The influence of technological parameters on dehydrochlorination of dichloropropanols Type de document : texte imprimé Auteurs : Eugeniusz Milchert, Auteur ; Anna Krzyzanowska, Auteur ; Agnieszka Wolosiak-Hnat, Auteur Année de publication : 2012 Article en page(s) : pp. 3575–3579 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dichloropropanols Hydroxide Résumé : The influence of technological parameters on dehydrochlorination of dichloropropanols to epichlorohydrin performed on a reaction-stripping column and a prereactor was studied. For a fixed flows of dichloropropanols solution, lime milk solution, and steam through the column, the conversion of dichloropropanols and the yield of epichlorohydrin were calculated. The influence of an excess of lime milk solution, recirculation of the water layer of the distillate from the column, the rate of steam flow through the column, and an excess of calcium hydroxide over dichloropropanols on the course of the process was studied. Moreover, the effects of the reaction time and temperature of the prereactor were tested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202630n
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3575–3579[article] The influence of technological parameters on dehydrochlorination of dichloropropanols [texte imprimé] / Eugeniusz Milchert, Auteur ; Anna Krzyzanowska, Auteur ; Agnieszka Wolosiak-Hnat, Auteur . - 2012 . - pp. 3575–3579.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3575–3579
Mots-clés : Dichloropropanols Hydroxide Résumé : The influence of technological parameters on dehydrochlorination of dichloropropanols to epichlorohydrin performed on a reaction-stripping column and a prereactor was studied. For a fixed flows of dichloropropanols solution, lime milk solution, and steam through the column, the conversion of dichloropropanols and the yield of epichlorohydrin were calculated. The influence of an excess of lime milk solution, recirculation of the water layer of the distillate from the column, the rate of steam flow through the column, and an excess of calcium hydroxide over dichloropropanols on the course of the process was studied. Moreover, the effects of the reaction time and temperature of the prereactor were tested. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202630n Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Kinetic and thermodynamic investigation of lipase - catalyzed hydrolysis of (R,S) - 3 - phenylbutyl azolides Type de document : texte imprimé Auteurs : Jin-Ru Chen, Auteur ; Chia-Ching Wu, Auteur ; Pei-Yun Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 3580-3586 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrolysis Enzymatic catalysis Kinetics Résumé : Water-saturated cydohexane at 25 °C is selected as the best reaction condition for Novozym 435-catalyzed hydrolytic resolution of (R,S)-3-phenylbutyl 4-methylpyazolide (1). The kinetic constants and enantiomeric ratio of 36 are then estimated from the kinetic analysis and successfully employed for simulating the time-course conversions of both enantiomers. A feed-batch operation with water added during the reaction is proposed for converting the fast-reacting enantiomer of high concentrations to the product. A linear enthalpy-entropy compensation relationship of ―ΔΔS = ―38.84 + 3.29(―ΔΔH) with R2 = 0.98 for the lipase-catalyzed hydrolysis or alcoholysis of several (R,S)-azolides in anhydrous or water-saturated solvents is addressed. The resolution platform is further extended to (R,S)-3-(Boc-amino)-3-phenylpropionyl 4-methylpyrazolide (10), leading to improved enzyme activity and enantioselectivity if anhydrous methyl tert-butyl ether or isopropanyl ether is selected as the reaction medium. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595784
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3580-3586[article] Kinetic and thermodynamic investigation of lipase - catalyzed hydrolysis of (R,S) - 3 - phenylbutyl azolides [texte imprimé] / Jin-Ru Chen, Auteur ; Chia-Ching Wu, Auteur ; Pei-Yun Wang, Auteur . - 2012 . - pp. 3580-3586.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3580-3586
Mots-clés : Hydrolysis Enzymatic catalysis Kinetics Résumé : Water-saturated cydohexane at 25 °C is selected as the best reaction condition for Novozym 435-catalyzed hydrolytic resolution of (R,S)-3-phenylbutyl 4-methylpyazolide (1). The kinetic constants and enantiomeric ratio of 36 are then estimated from the kinetic analysis and successfully employed for simulating the time-course conversions of both enantiomers. A feed-batch operation with water added during the reaction is proposed for converting the fast-reacting enantiomer of high concentrations to the product. A linear enthalpy-entropy compensation relationship of ―ΔΔS = ―38.84 + 3.29(―ΔΔH) with R2 = 0.98 for the lipase-catalyzed hydrolysis or alcoholysis of several (R,S)-azolides in anhydrous or water-saturated solvents is addressed. The resolution platform is further extended to (R,S)-3-(Boc-amino)-3-phenylpropionyl 4-methylpyrazolide (10), leading to improved enzyme activity and enantioselectivity if anhydrous methyl tert-butyl ether or isopropanyl ether is selected as the reaction medium. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595784 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Multiple controls on the chemical and physical structure of biochars Type de document : texte imprimé Auteurs : Hao Sun, Auteur ; William C Hockaday, Auteur ; Caroline A. Masiello, Auteur Année de publication : 2012 Article en page(s) : pp. 3587-3597 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biochars Résumé : Intentional amendment of soil with charcoal (called biochar) is a promising new approach to sequester atmospheric carbon dioxide and increase soil fertility. However, the environmental properties of biochars can vary with production conditions, making it challenging to engineer biochars that are simultaneously optimized for carbon sequestration, nutrient storage, and water-holding capacity. We report here the systematic characterization of biochars produced under a variety of highly controlled pyrolysis conditions from two biomass feedstocks (corn stover and apple wood). Our results suggest that the chemical composition and physical structure of biochars are determined not just by the maximum heat treatment temperature, but also by several other factors that include the pyrolysis heating rate, treatment time at the maximum temperature and particle size. We also test a new approach that combines reactivity measurements, diffusion-reaction theory and structural models to overcome some of the challenges encountered in characterizing the complicated pore structure of biochars. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201309r
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3587-3597[article] Multiple controls on the chemical and physical structure of biochars [texte imprimé] / Hao Sun, Auteur ; William C Hockaday, Auteur ; Caroline A. Masiello, Auteur . - 2012 . - pp. 3587-3597.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3587-3597
Mots-clés : Biochars Résumé : Intentional amendment of soil with charcoal (called biochar) is a promising new approach to sequester atmospheric carbon dioxide and increase soil fertility. However, the environmental properties of biochars can vary with production conditions, making it challenging to engineer biochars that are simultaneously optimized for carbon sequestration, nutrient storage, and water-holding capacity. We report here the systematic characterization of biochars produced under a variety of highly controlled pyrolysis conditions from two biomass feedstocks (corn stover and apple wood). Our results suggest that the chemical composition and physical structure of biochars are determined not just by the maximum heat treatment temperature, but also by several other factors that include the pyrolysis heating rate, treatment time at the maximum temperature and particle size. We also test a new approach that combines reactivity measurements, diffusion-reaction theory and structural models to overcome some of the challenges encountered in characterizing the complicated pore structure of biochars. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201309r Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Effect of adsorbed water and surface hydroxyls on the hydrolysis of VX, GD, and HD on titania materials : The development of self - decontaminating paints Type de document : texte imprimé Auteurs : George W. Wagner, Auteur ; Gregory W. Peterson, Auteur ; John J. Mahle, Auteur Année de publication : 2012 Article en page(s) : pp. 3598–3603 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorbed water Hydrolysis Résumé : Titania materials such as anatase (TiO2), nanotubular titania (NTT), and nanocrystalline titania (nTiO2) exhibit extremely short half-lives for VX, provided adequate surface-adsorbed water is present. The effect of coadsorbed water on the hydrolytic activity of these materials toward VX, GD, and HD was assessed to select the most promising candidate for study in self-decontaminating paints and coatings. The best candidate is nTiO2, primarily chosen for its extremely short VX half-life at quite high water-content. For the most part, imbedding nTiO2 into various coatings negatively impacts its reactivity. A notable exception is observed for the case of HD and nTiO2/Wax (a paint simulant), where a somewhat shorter half-life is observed compared to the nascent nTiO2 powder. However, encrusting a painted surface with nTiO2 powder, leaving it partly exposed rather than wholly imbedded, results in improved reactivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202063p
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3598–3603[article] Effect of adsorbed water and surface hydroxyls on the hydrolysis of VX, GD, and HD on titania materials : The development of self - decontaminating paints [texte imprimé] / George W. Wagner, Auteur ; Gregory W. Peterson, Auteur ; John J. Mahle, Auteur . - 2012 . - pp. 3598–3603.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3598–3603
Mots-clés : Adsorbed water Hydrolysis Résumé : Titania materials such as anatase (TiO2), nanotubular titania (NTT), and nanocrystalline titania (nTiO2) exhibit extremely short half-lives for VX, provided adequate surface-adsorbed water is present. The effect of coadsorbed water on the hydrolytic activity of these materials toward VX, GD, and HD was assessed to select the most promising candidate for study in self-decontaminating paints and coatings. The best candidate is nTiO2, primarily chosen for its extremely short VX half-life at quite high water-content. For the most part, imbedding nTiO2 into various coatings negatively impacts its reactivity. A notable exception is observed for the case of HD and nTiO2/Wax (a paint simulant), where a somewhat shorter half-life is observed compared to the nascent nTiO2 powder. However, encrusting a painted surface with nTiO2 powder, leaving it partly exposed rather than wholly imbedded, results in improved reactivity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202063p Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Nickel – silicon intermetallics with enhanced selectivity in hydrogenation reactions of cinnamaldehyde and phenylacetylene Type de document : texte imprimé Auteurs : Xiao Chen, Auteur ; Miao Li, Auteur ; Jingchao Guan, Auteur Année de publication : 2012 Article en page(s) : pp. 3604-3611 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrogenation Résumé : Nickel―silicon intermetallics have been prepared by a direct silicification method using SiH4 as the silicon source. The prepared nickel―silicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel―silicon intermetallics was investigated. Nickel―silicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel―silicon intermetallics and oxygen atoms in the C=O bond of cinnamaldehyde. In addition, nickel-silicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595787
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3604-3611[article] Nickel – silicon intermetallics with enhanced selectivity in hydrogenation reactions of cinnamaldehyde and phenylacetylene [texte imprimé] / Xiao Chen, Auteur ; Miao Li, Auteur ; Jingchao Guan, Auteur . - 2012 . - pp. 3604-3611.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3604-3611
Mots-clés : Hydrogenation Résumé : Nickel―silicon intermetallics have been prepared by a direct silicification method using SiH4 as the silicon source. The prepared nickel―silicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel―silicon intermetallics was investigated. Nickel―silicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel―silicon intermetallics and oxygen atoms in the C=O bond of cinnamaldehyde. In addition, nickel-silicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595787 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Boric acid extraction from calcined colemanite with ammonium carbonate solutions Type de document : texte imprimé Auteurs : Asim Kunkul, Auteur ; Nezahat Ezgi Aslan, Auteur ; Ahmet Ekmekyapar, Auteur Année de publication : 2012 Article en page(s) : pp. 3612–3618 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Boric acid Colemanite Résumé : Colemanite, a calcium-borate hydrate, is found in significant amounts in Turkey. Colemanite is used as a raw material in the production of boric acid. In this study, the leaching kinetics of calcined colemanite in ammonium carbonate solutions was investigated in a batch reactor. The effects of calcination temperature, solution concentration, solid-to-liquid ratio, stirring speed, and reaction temperature on the dissolution rate were determined and evaluated. It was found that the dissolution rate of calcined samples was higher than that of the uncalcined sample. It was observed that the leaching rate of calcined colemanite enhanced with increasing calcination temperature up to 450 °C, and did not change above this temperature. Thus, it was found that the applied calcination temperature had a significant effect on the leaching of colemanite. It was determined that the leaching rate raised with an increasing ammonium carbonate concentration, increasing reaction temperature, and decreasing solid/liquid ratio. It was detected that calcium carbonate was not formed on the particle surface. The dissolution kinetics of calcined colemanite was examined using both heterogeneous and homogeneous reaction models, and it was determined that the reaction rate can be described by a first-order pseudohomogeneous reaction model. The activation energy for this process was calculated to be 59.03 kJ/mol. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202388x
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3612–3618[article] Boric acid extraction from calcined colemanite with ammonium carbonate solutions [texte imprimé] / Asim Kunkul, Auteur ; Nezahat Ezgi Aslan, Auteur ; Ahmet Ekmekyapar, Auteur . - 2012 . - pp. 3612–3618.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3612–3618
Mots-clés : Boric acid Colemanite Résumé : Colemanite, a calcium-borate hydrate, is found in significant amounts in Turkey. Colemanite is used as a raw material in the production of boric acid. In this study, the leaching kinetics of calcined colemanite in ammonium carbonate solutions was investigated in a batch reactor. The effects of calcination temperature, solution concentration, solid-to-liquid ratio, stirring speed, and reaction temperature on the dissolution rate were determined and evaluated. It was found that the dissolution rate of calcined samples was higher than that of the uncalcined sample. It was observed that the leaching rate of calcined colemanite enhanced with increasing calcination temperature up to 450 °C, and did not change above this temperature. Thus, it was found that the applied calcination temperature had a significant effect on the leaching of colemanite. It was determined that the leaching rate raised with an increasing ammonium carbonate concentration, increasing reaction temperature, and decreasing solid/liquid ratio. It was detected that calcium carbonate was not formed on the particle surface. The dissolution kinetics of calcined colemanite was examined using both heterogeneous and homogeneous reaction models, and it was determined that the reaction rate can be described by a first-order pseudohomogeneous reaction model. The activation energy for this process was calculated to be 59.03 kJ/mol. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202388x Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Polysaccharide nanocomposites reinforced with graphene oxide and keratin - grafted graphene oxide Type de document : texte imprimé Auteurs : Claramaria Rodriguez-Gonzalez, Auteur ; Ana L. Martinez-Hernandez, Auteur ; Victor M. Castano, Auteur Année de publication : 2012 Article en page(s) : pp. 3619–3629 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanocomposites Graphene oxide Résumé : Nanocomposites of polysaccharide matrices, chitosan–starch, and carboxymethyl cellulose-starch reinforced with graphene oxide and graphene grafted with keratin were developed. Composites films had been prepared for the casting/solvent evaporation method. The interaction and distribution of graphene materials in the biopolymer matrices were analyzed by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM), and the thermomechanical properties were examined using dynamic mechanical analysis. The nanocomposites of the chitosan–starch matrix improved their mechanical properties substantially, with respect to the film without reinforcing, obtaining an increase of 929% in the storage modulus (E′, 35 °C) with only 0.5 wt % of graphene oxide and outstanding increments in E′ at 150 and 200 °C when keratin-grafted graphene oxide is incorporated (0.1 wt %). In contrast, the graphene oxide incorporated into the carboxymethyl cellulose–starch matrix tends to decrease the stiffness of the film, behaving in a manner opposite to that of nanocomposites of the chitosan–starch matrix. Similarly, the incorporation of graphene grafted with keratin shows a decrease in the rigidity of the resulting material. In this way, the importance of compatibility between the graphene and the host matrix to achieve a fine control of interface and manipulate the final properties of the material is demonstrated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200742x
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3619–3629[article] Polysaccharide nanocomposites reinforced with graphene oxide and keratin - grafted graphene oxide [texte imprimé] / Claramaria Rodriguez-Gonzalez, Auteur ; Ana L. Martinez-Hernandez, Auteur ; Victor M. Castano, Auteur . - 2012 . - pp. 3619–3629.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3619–3629
Mots-clés : Nanocomposites Graphene oxide Résumé : Nanocomposites of polysaccharide matrices, chitosan–starch, and carboxymethyl cellulose-starch reinforced with graphene oxide and graphene grafted with keratin were developed. Composites films had been prepared for the casting/solvent evaporation method. The interaction and distribution of graphene materials in the biopolymer matrices were analyzed by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM), and the thermomechanical properties were examined using dynamic mechanical analysis. The nanocomposites of the chitosan–starch matrix improved their mechanical properties substantially, with respect to the film without reinforcing, obtaining an increase of 929% in the storage modulus (E′, 35 °C) with only 0.5 wt % of graphene oxide and outstanding increments in E′ at 150 and 200 °C when keratin-grafted graphene oxide is incorporated (0.1 wt %). In contrast, the graphene oxide incorporated into the carboxymethyl cellulose–starch matrix tends to decrease the stiffness of the film, behaving in a manner opposite to that of nanocomposites of the chitosan–starch matrix. Similarly, the incorporation of graphene grafted with keratin shows a decrease in the rigidity of the resulting material. In this way, the importance of compatibility between the graphene and the host matrix to achieve a fine control of interface and manipulate the final properties of the material is demonstrated. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200742x Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Fabrication and performance of copper phthalocyanine/squaraine dye /perylene composite with bulk heterojunctions by the solution blending process Type de document : texte imprimé Auteurs : Chien-Hsun Chen, Auteur ; Wen-Tung Cheng, Auteur ; Ming-Liao Tsai, Auteur Année de publication : 2012 Article en page(s) : pp. 3630–3638 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Composite material Dyes Résumé : In this paper, copper tetra-(2, 4-dimethyl-3-pentoxy) phthalocyanine (CuPc-712), 2-[2-methylene-1,1,3-trimethyl-1H-benzo[e]inline]-4-[1-ethanol-2-methylquino]-cyclobutadienylium-1,3-diolate (SQ-700), and 3,4,9,10-tetra-(heptyl acetate)-perylene (Pery-C7), attached with functional groups by covalent bonds were synthesized. In addition, bulk heterojunction diodes made from ITO/PEDOT:PSS (CuPc-712+SQ-700+Pery-C7)/Al have been realized and studied by I–V characteristic measurements in the dark and under illumination (ITO is indium tin oxide; PEDOT:PSS is poly(3,4-ethylene dioxythiophene) oxidized (doped) with poly(4-styrene sulfonate)). Enhanced photosensitivity was observed in the photoreceptor made from the composite (CuPc-712+SQ-700+Pery-C7), which was interpreted in terms of the expansion of light absorption spectrum and to charge separation by the bulk heterojunctions. In addition, the presence of a thin PEDOT:PSS film at the ITO/(CuPc-712+SQ-700+Pery-C7) interface allows one to achieve a significant photovoltaic efficiency of 0.2%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595790
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3630–3638[article] Fabrication and performance of copper phthalocyanine/squaraine dye /perylene composite with bulk heterojunctions by the solution blending process [texte imprimé] / Chien-Hsun Chen, Auteur ; Wen-Tung Cheng, Auteur ; Ming-Liao Tsai, Auteur . - 2012 . - pp. 3630–3638.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3630–3638
Mots-clés : Composite material Dyes Résumé : In this paper, copper tetra-(2, 4-dimethyl-3-pentoxy) phthalocyanine (CuPc-712), 2-[2-methylene-1,1,3-trimethyl-1H-benzo[e]inline]-4-[1-ethanol-2-methylquino]-cyclobutadienylium-1,3-diolate (SQ-700), and 3,4,9,10-tetra-(heptyl acetate)-perylene (Pery-C7), attached with functional groups by covalent bonds were synthesized. In addition, bulk heterojunction diodes made from ITO/PEDOT:PSS (CuPc-712+SQ-700+Pery-C7)/Al have been realized and studied by I–V characteristic measurements in the dark and under illumination (ITO is indium tin oxide; PEDOT:PSS is poly(3,4-ethylene dioxythiophene) oxidized (doped) with poly(4-styrene sulfonate)). Enhanced photosensitivity was observed in the photoreceptor made from the composite (CuPc-712+SQ-700+Pery-C7), which was interpreted in terms of the expansion of light absorption spectrum and to charge separation by the bulk heterojunctions. In addition, the presence of a thin PEDOT:PSS film at the ITO/(CuPc-712+SQ-700+Pery-C7) interface allows one to achieve a significant photovoltaic efficiency of 0.2%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595790 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Sulfur distribution between liquid iron and magnesia - saturated slag in H2 / H2O atmosphere relevant to a novel green ironmaking technolog Type de document : texte imprimé Auteurs : M. Y. Mohassab-Ahmed, Auteur ; H. Y. Sohn, Auteur ; Hang Goo Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 3639–3645 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Slag Résumé : As an integral part of a research project which aimed to develop a novel green ironmaking process, an experimental determination of the sulfur distribution ratios, LS, between molten iron and CaO–MgO(saturated)–SiO2–Al2O3–FeO slag was carried out in the temperature range of 1550–1650 °C. Oxygen partial pressure was controlled by H2/H2O equilibrium in the range of 10–10–10–8 atm. Under these conditions applicable to the proposed process, LS was 34 times smaller than that under the conditions of the blast furnace. Considering the relative amounts of sulfur inputs in the two processes as well as other factors, however, the proposed process is expected to produce iron with a lower sulfur content, which will decrease the need for desulfurization in the steelmaking stage. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595791
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3639–3645[article] Sulfur distribution between liquid iron and magnesia - saturated slag in H2 / H2O atmosphere relevant to a novel green ironmaking technolog [texte imprimé] / M. Y. Mohassab-Ahmed, Auteur ; H. Y. Sohn, Auteur ; Hang Goo Kim, Auteur . - 2012 . - pp. 3639–3645.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3639–3645
Mots-clés : Slag Résumé : As an integral part of a research project which aimed to develop a novel green ironmaking process, an experimental determination of the sulfur distribution ratios, LS, between molten iron and CaO–MgO(saturated)–SiO2–Al2O3–FeO slag was carried out in the temperature range of 1550–1650 °C. Oxygen partial pressure was controlled by H2/H2O equilibrium in the range of 10–10–10–8 atm. Under these conditions applicable to the proposed process, LS was 34 times smaller than that under the conditions of the blast furnace. Considering the relative amounts of sulfur inputs in the two processes as well as other factors, however, the proposed process is expected to produce iron with a lower sulfur content, which will decrease the need for desulfurization in the steelmaking stage. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595791 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Corrosion - resistant zeolite silicalite - 1 Coatings synthesized by seeded growth Type de document : texte imprimé Auteurs : Yanjuan Dong, Auteur ; Yong Peng, Auteur ; Guolong Wang, Auteur Année de publication : 2012 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Corrosion Zeolite Résumé : It has been proved that zeolite MFI coatings synthesized by in situ hydrothermal synthesis is corrosion-resistant. Pure silica zeolite MFI (silicalite-1) coatings on aluminum alloy 1060 plates seeded by brush-coating a seed paste and leveling the seed layer with fingers have been synthesized by the seeded growth method in this study. The seed paste is composed of seeds, silica sol, and water. The effects of the seed/sol ratio and the seed crystal size on the properties of silicalite-1 coatings are investigated in detail. The corrosion protection performance of the silicalite-1 coatings on aluminum alloy plates is determined by a direct current polarization technique. The silicalite-1 coatings (3 μm thick) obtained by the seeded growth method at 150 °C for 3 h are found to be highly b-oriented and corrosion-resistant in severely corrosive acidic aqueous solution (0.5 M H2SO4) and sodium chloride aqueous solution (0.5 M) exposed to air at room temperature. The optimum seed/sol ratio and the seed crystal size in the seed paste are 6.0 and 500 nm, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202080a
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012)[article] Corrosion - resistant zeolite silicalite - 1 Coatings synthesized by seeded growth [texte imprimé] / Yanjuan Dong, Auteur ; Yong Peng, Auteur ; Guolong Wang, Auteur . - 2012.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012)
Mots-clés : Corrosion Zeolite Résumé : It has been proved that zeolite MFI coatings synthesized by in situ hydrothermal synthesis is corrosion-resistant. Pure silica zeolite MFI (silicalite-1) coatings on aluminum alloy 1060 plates seeded by brush-coating a seed paste and leveling the seed layer with fingers have been synthesized by the seeded growth method in this study. The seed paste is composed of seeds, silica sol, and water. The effects of the seed/sol ratio and the seed crystal size on the properties of silicalite-1 coatings are investigated in detail. The corrosion protection performance of the silicalite-1 coatings on aluminum alloy plates is determined by a direct current polarization technique. The silicalite-1 coatings (3 μm thick) obtained by the seeded growth method at 150 °C for 3 h are found to be highly b-oriented and corrosion-resistant in severely corrosive acidic aqueous solution (0.5 M H2SO4) and sodium chloride aqueous solution (0.5 M) exposed to air at room temperature. The optimum seed/sol ratio and the seed crystal size in the seed paste are 6.0 and 500 nm, respectively. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202080a Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Carbon dioxide capture by amine - impregnated mesocellular - foam - containing template Type de document : texte imprimé Auteurs : Yan, Wei, Auteur ; Jing Tang, Auteur ; Zijun Bian, Auteur Année de publication : 2012 Article en page(s) : pp. 3653–3662 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Silica mesocellular Dioxide Résumé : By impregnating polyethylenimine (PEI) into silica mesocellular foam with the template remaining (MCF(a)), a novel sorbent with both high CO2 adsorption capacity and high thermal stability was obtained. The remaining P123 template in the MCF played a great role in promoting the CO2 adsorption capacity, which could be 4.5 mmol·g–1 (adsorbent) when the amount of amine loading and the adsorption temperature were optimized as 60% and at 70 °C for the sample MCF(a)/PEI. Meanwhile, MCF(a)/PEI had a high thermal stability and selectivity, after 10 adsorption–desorption cycles, MCF(a)/PEI almost held a constant adsorption capacity; for different compositions of CO2 and N2 mixed gases, it always kept a high adsorption selectivity of CO2/N2. The mechanism of the template synergistic effect was elucidated by the result of a second-order rate law through CO2 adsorption kinetic studies. Moreover, as predicted by the Langmuir adsorption model with n = 2 (two active adsorption sites for one CO2 molecule), the adsorption enthalpy was calculated as about −85 kJ·mol–1, a value which belonged to typical chemical adsorption. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202093h
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3653–3662[article] Carbon dioxide capture by amine - impregnated mesocellular - foam - containing template [texte imprimé] / Yan, Wei, Auteur ; Jing Tang, Auteur ; Zijun Bian, Auteur . - 2012 . - pp. 3653–3662.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3653–3662
Mots-clés : Silica mesocellular Dioxide Résumé : By impregnating polyethylenimine (PEI) into silica mesocellular foam with the template remaining (MCF(a)), a novel sorbent with both high CO2 adsorption capacity and high thermal stability was obtained. The remaining P123 template in the MCF played a great role in promoting the CO2 adsorption capacity, which could be 4.5 mmol·g–1 (adsorbent) when the amount of amine loading and the adsorption temperature were optimized as 60% and at 70 °C for the sample MCF(a)/PEI. Meanwhile, MCF(a)/PEI had a high thermal stability and selectivity, after 10 adsorption–desorption cycles, MCF(a)/PEI almost held a constant adsorption capacity; for different compositions of CO2 and N2 mixed gases, it always kept a high adsorption selectivity of CO2/N2. The mechanism of the template synergistic effect was elucidated by the result of a second-order rate law through CO2 adsorption kinetic studies. Moreover, as predicted by the Langmuir adsorption model with n = 2 (two active adsorption sites for one CO2 molecule), the adsorption enthalpy was calculated as about −85 kJ·mol–1, a value which belonged to typical chemical adsorption. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202093h Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Thermal properties and combustion behaviors of chitosan based flame retardant combining phosphorus and nickel Type de document : texte imprimé Auteurs : Shuang Wu, Auteur ; Lei Song, Auteur ; Haifeng Pan, Auteur Année de publication : 2012 Article en page(s) : pp. 3663-3669 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flame retardant Combustion Thermal properties Résumé : A renewable carbonization agent based compound nickel chitosan phosphate (NiPCS) has been prepared, which was the combination of flame retardant and synergist. Its effect on thermal properties and flammability of poly(vinyl alcohol) (PVA) has been investigated. Microscale combustion calorimetry (MCC) test proved that NiPCS can decrease the intensities of heat release rate (PHRR) and total heat release rate (THR) greatly. Thermogravimetric analysis (TGA) results indicated that NiPCS possessed a high formation of char. With the increase of the flame retardant, the thermal stability of materials enhanced in high temperature. Real time Fourier transform infrared (RT-IR) data confirmed that the flame retardant can promote the dehydration effect as well as accelerate the char forming. The volatilized products and the synergistic effect of nickel on thermal properties were both investigated with thermogravimetric analysis/infrared spectrometry (TGA-IR) and laser Raman spectroscopy (LRS). The results revealed that nickel restrained the thermal degradation of materials as well as improved the structural organization level of char. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595794
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3663-3669[article] Thermal properties and combustion behaviors of chitosan based flame retardant combining phosphorus and nickel [texte imprimé] / Shuang Wu, Auteur ; Lei Song, Auteur ; Haifeng Pan, Auteur . - 2012 . - pp. 3663-3669.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3663-3669
Mots-clés : Flame retardant Combustion Thermal properties Résumé : A renewable carbonization agent based compound nickel chitosan phosphate (NiPCS) has been prepared, which was the combination of flame retardant and synergist. Its effect on thermal properties and flammability of poly(vinyl alcohol) (PVA) has been investigated. Microscale combustion calorimetry (MCC) test proved that NiPCS can decrease the intensities of heat release rate (PHRR) and total heat release rate (THR) greatly. Thermogravimetric analysis (TGA) results indicated that NiPCS possessed a high formation of char. With the increase of the flame retardant, the thermal stability of materials enhanced in high temperature. Real time Fourier transform infrared (RT-IR) data confirmed that the flame retardant can promote the dehydration effect as well as accelerate the char forming. The volatilized products and the synergistic effect of nickel on thermal properties were both investigated with thermogravimetric analysis/infrared spectrometry (TGA-IR) and laser Raman spectroscopy (LRS). The results revealed that nickel restrained the thermal degradation of materials as well as improved the structural organization level of char. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595794 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Interactions between sodium cholate or sodium deoxycholate and nonionic surfactant (Tween 20 or Tween 60) in aqueous solution Type de document : texte imprimé Auteurs : Dejan M. Cirin, Auteur ; Mihalj M. Posa, Auteur ; Veljko S. Krstonosic, Auteur Année de publication : 2012 Article en page(s) : pp. 3670-3676 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous solution Non ionic surfactant Résumé : Knowledge of physicochemical parameters of mixed micelles is important in order to develop drug delivery systems with required characteristics. Investigated bile salts and Tweens are relatively nontoxic surfactants, extensively studied as biocompatible colloidal drug carriers. The micellization behavior of binary anionic-nonionic surfactant mixtures built of sodium cholate or sodium deoxycholate and one of two Tweens (Tween 20 or Tween 60) was investigated by conductivity and surface tension measurements. The results of the study have been analyzed using Clint's, Rubingh's, and Motomura's theories for mixed binary systems. The determined physicochemical properties, particularly the negative values of the interaction parameter, indicate synergism between the individual surfactants in the mixed micelles. It was noticed that Tween with a longer hydrophobic tail shows stronger interactions with selected bile salts. However, it was found that the more hydrophilic bile salt (sodium cholate) generates the stronger synergism with investigated Tweens. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595795
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3670-3676[article] Interactions between sodium cholate or sodium deoxycholate and nonionic surfactant (Tween 20 or Tween 60) in aqueous solution [texte imprimé] / Dejan M. Cirin, Auteur ; Mihalj M. Posa, Auteur ; Veljko S. Krstonosic, Auteur . - 2012 . - pp. 3670-3676.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3670-3676
Mots-clés : Aqueous solution Non ionic surfactant Résumé : Knowledge of physicochemical parameters of mixed micelles is important in order to develop drug delivery systems with required characteristics. Investigated bile salts and Tweens are relatively nontoxic surfactants, extensively studied as biocompatible colloidal drug carriers. The micellization behavior of binary anionic-nonionic surfactant mixtures built of sodium cholate or sodium deoxycholate and one of two Tweens (Tween 20 or Tween 60) was investigated by conductivity and surface tension measurements. The results of the study have been analyzed using Clint's, Rubingh's, and Motomura's theories for mixed binary systems. The determined physicochemical properties, particularly the negative values of the interaction parameter, indicate synergism between the individual surfactants in the mixed micelles. It was noticed that Tween with a longer hydrophobic tail shows stronger interactions with selected bile salts. However, it was found that the more hydrophilic bile salt (sodium cholate) generates the stronger synergism with investigated Tweens. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595795 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Hydrogen - plasma - assisted growth of anatase TiO2 nanoneedles on Ti plates Type de document : texte imprimé Auteurs : Ruey-Chi Wang, Auteur ; Chia-Chi Hsu, Auteur ; Shu-Jen Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 3677–3681 Note générale : Chimie industriell Langues : Anglais (eng) Mots-clés : Hydrogen plasma treatments Résumé : Pure anatase TiO2 nanoneedles are prepared on substrates via a dry process that involves hydrogen plasma treatments followed by the oxidation of Ti plates at a low temperature of 500 °C. Scanning electron microscopy and high-resolution transmission electron microscopy images show that the nanoneedles have diameters and lengths in ranges of 20–50 nm and 100–200 nm, respectively, and are single-crystalline anatase structures that grow along the [11̅6] direction. The TiO2 nanoneedles nucleate on microgrooves that result from the oxidation of microcracks induced by the hydrogen plasma. The diameters, lengths, and area densities of the TiO2 nanoneedles can be varied by adjusting the power of the hydrogen plasma. A stress-assisted vapor–solid mechanism for the formation of the nanoneedles is proposed. The room-temperature photoluminescence spectrum of the TiO2 nanoneedles exhibits a relatively strong ultraviolet emission centered at 375 nm and broad visible emission at around 640 nm. This study proposes a route for growing anatase-phase TiO2 one-dimensional nanostructues on substrates that have potential use in photocatalytic, photoelectrochemical, and sensing applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202558s
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3677–3681[article] Hydrogen - plasma - assisted growth of anatase TiO2 nanoneedles on Ti plates [texte imprimé] / Ruey-Chi Wang, Auteur ; Chia-Chi Hsu, Auteur ; Shu-Jen Chen, Auteur . - 2012 . - pp. 3677–3681.
Chimie industriell
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3677–3681
Mots-clés : Hydrogen plasma treatments Résumé : Pure anatase TiO2 nanoneedles are prepared on substrates via a dry process that involves hydrogen plasma treatments followed by the oxidation of Ti plates at a low temperature of 500 °C. Scanning electron microscopy and high-resolution transmission electron microscopy images show that the nanoneedles have diameters and lengths in ranges of 20–50 nm and 100–200 nm, respectively, and are single-crystalline anatase structures that grow along the [11̅6] direction. The TiO2 nanoneedles nucleate on microgrooves that result from the oxidation of microcracks induced by the hydrogen plasma. The diameters, lengths, and area densities of the TiO2 nanoneedles can be varied by adjusting the power of the hydrogen plasma. A stress-assisted vapor–solid mechanism for the formation of the nanoneedles is proposed. The room-temperature photoluminescence spectrum of the TiO2 nanoneedles exhibits a relatively strong ultraviolet emission centered at 375 nm and broad visible emission at around 640 nm. This study proposes a route for growing anatase-phase TiO2 one-dimensional nanostructues on substrates that have potential use in photocatalytic, photoelectrochemical, and sensing applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202558s Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Fabrication of polylactide / poly (ε - caprolactone) blend fibers by electrospinning : Morphology and orientation Type de document : texte imprimé Auteurs : Liangliang Lu, Auteur ; Defeng Wu, Auteur ; Ming Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 3682–3691 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fiber Polylactide Résumé : Randomly oriented fiber mats and well-aligned fiber bundles of the biodegradable polylactide (PLA)/poly(ε-caprolactone) (PCL) blends were successfully produced by electrospinning in the present study. For the reticulate fibers, the effects of the blending ratio of two polymers and compositions of mixed solvents on fiber morphology were investigated. The results reveal that the fibers with lower PCL mass fraction show better morphology with larger average fiber diameter than those of the fibers with higher PCL mass fraction. Besides, a small addition of dimethylformamide (DMF) as the assistant solvent favors further improvement of fiber morphology because of the synergistic effects by improved conductivity and altered viscosity of the electrospun solutions. Although the as-obtained blend fibers show smooth surface structure, the phase separation between PCL and PLA occurs inside the fibers because the two components are thermodynamically immiscible, and the discrete phase shows an elongated morphology along with the fiber axis, instead of the droplet structure. For the aligned fiber bundles collected on a rotating disk, the degree of order increases with increase of the tangential velocity, accompanied by reduced average fiber diameter. Hierarchical orientations including the macroscopic fiber alignment, the elongation of discrete PCL phase, and the molecular orientation of both the PLA and PCL can be observed within the aligned blend fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028969
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3682–3691[article] Fabrication of polylactide / poly (ε - caprolactone) blend fibers by electrospinning : Morphology and orientation [texte imprimé] / Liangliang Lu, Auteur ; Defeng Wu, Auteur ; Ming Zhang, Auteur . - 2012 . - pp. 3682–3691.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3682–3691
Mots-clés : Fiber Polylactide Résumé : Randomly oriented fiber mats and well-aligned fiber bundles of the biodegradable polylactide (PLA)/poly(ε-caprolactone) (PCL) blends were successfully produced by electrospinning in the present study. For the reticulate fibers, the effects of the blending ratio of two polymers and compositions of mixed solvents on fiber morphology were investigated. The results reveal that the fibers with lower PCL mass fraction show better morphology with larger average fiber diameter than those of the fibers with higher PCL mass fraction. Besides, a small addition of dimethylformamide (DMF) as the assistant solvent favors further improvement of fiber morphology because of the synergistic effects by improved conductivity and altered viscosity of the electrospun solutions. Although the as-obtained blend fibers show smooth surface structure, the phase separation between PCL and PLA occurs inside the fibers because the two components are thermodynamically immiscible, and the discrete phase shows an elongated morphology along with the fiber axis, instead of the droplet structure. For the aligned fiber bundles collected on a rotating disk, the degree of order increases with increase of the tangential velocity, accompanied by reduced average fiber diameter. Hierarchical orientations including the macroscopic fiber alignment, the elongation of discrete PCL phase, and the molecular orientation of both the PLA and PCL can be observed within the aligned blend fibers. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028969 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Influences of pressure on the operation of reactive distillation columns involving kinetically controlled exothermic reactions Type de document : texte imprimé Auteurs : Chao Wang, Auteur ; Liang Zhang, Auteur ; Kejin Huang, Auteur Année de publication : 2012 Article en page(s) : pp. 3692-3708 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Exothermic reaction Distillation column with Résumé : For the reactive distillation column involving a kinetically controlled exothermic reaction, operating pressure can present nonmonotonic influences on process dynamics and operation. While the enhancement of operating pressure benefits process dynamics and controllability in the lower part of its feasible region (which is confined by the temperature levels of the available cold and hot utilities), it turns to deteriorate process dynamics and controllability in the higher part of its feasible region. Three reactive distillation systems, including an ideal reactive distillation column performing a hypothetical exothermic reaction, A + Bkf⇄ kb C + D, and two real ones producing, respectively, methyl acetate from acetic acid and methanol and methyl tertiary butyl ether (MTBE) from isobutylene and methanol, are thoroughly studied in this work, and the results confirm the existence of this unique phenomenon. The intricate behavior of such kind of reactive distillation columns is essentially governed by the conflicting effects of operating pressure on reaction rate and chemical equilibrium constant and determines actually a favorable region of operating pressure for process dynamics and operation. Because the region may or may not coincide with the one in terms of process synthesis and design, operating pressure can therefore serve as an important decision variable to trade-off process design and operation, rendering the resultant process design with balanced steady-state performance and process dynamics and controllability. ISSN : 0888 -5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595798
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3692-3708[article] Influences of pressure on the operation of reactive distillation columns involving kinetically controlled exothermic reactions [texte imprimé] / Chao Wang, Auteur ; Liang Zhang, Auteur ; Kejin Huang, Auteur . - 2012 . - pp. 3692-3708.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3692-3708
Mots-clés : Exothermic reaction Distillation column with Résumé : For the reactive distillation column involving a kinetically controlled exothermic reaction, operating pressure can present nonmonotonic influences on process dynamics and operation. While the enhancement of operating pressure benefits process dynamics and controllability in the lower part of its feasible region (which is confined by the temperature levels of the available cold and hot utilities), it turns to deteriorate process dynamics and controllability in the higher part of its feasible region. Three reactive distillation systems, including an ideal reactive distillation column performing a hypothetical exothermic reaction, A + Bkf⇄ kb C + D, and two real ones producing, respectively, methyl acetate from acetic acid and methanol and methyl tertiary butyl ether (MTBE) from isobutylene and methanol, are thoroughly studied in this work, and the results confirm the existence of this unique phenomenon. The intricate behavior of such kind of reactive distillation columns is essentially governed by the conflicting effects of operating pressure on reaction rate and chemical equilibrium constant and determines actually a favorable region of operating pressure for process dynamics and operation. Because the region may or may not coincide with the one in terms of process synthesis and design, operating pressure can therefore serve as an important decision variable to trade-off process design and operation, rendering the resultant process design with balanced steady-state performance and process dynamics and controllability. ISSN : 0888 -5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595798 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Effects of gas type and hopper pressure on the discharge of pulverized coal Type de document : texte imprimé Auteurs : Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xin Gong, Auteur Année de publication : 2012 Article en page(s) : pp. 3709-3714 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Coal Bin Résumé : The influence of gas type (air and CO2) and hopper pressure (0―400 kPa) on the discharge of the pulverized coal was investigated. For aerated discharge, fluidization in the hopper is the initial state of the discharge process; the state of gas-solid fluidization affects the subsequent hopper discharging significantly. Compared to air, CO2 showed a weaker ability to fluidize the pulverized coal, and thus it was more difficult to improve the hopper discharge at atmospheric pressure. On the other hand, increasing the hopper pressure did not affect the basic discharge law but increased the discharge rate to a certain degree. In addition, with the increase of the hopper pressure, the discharge differences between the air and CO2 aeration series reduced, because the discharge rate had a larger promotion from atmospheric pressure to 400 kPa for the CO2 case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595799
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3709-3714[article] Effects of gas type and hopper pressure on the discharge of pulverized coal [texte imprimé] / Haifeng Lu, Auteur ; Xiaolei Guo, Auteur ; Xin Gong, Auteur . - 2012 . - pp. 3709-3714.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3709-3714
Mots-clés : Coal Bin Résumé : The influence of gas type (air and CO2) and hopper pressure (0―400 kPa) on the discharge of the pulverized coal was investigated. For aerated discharge, fluidization in the hopper is the initial state of the discharge process; the state of gas-solid fluidization affects the subsequent hopper discharging significantly. Compared to air, CO2 showed a weaker ability to fluidize the pulverized coal, and thus it was more difficult to improve the hopper discharge at atmospheric pressure. On the other hand, increasing the hopper pressure did not affect the basic discharge law but increased the discharge rate to a certain degree. In addition, with the increase of the hopper pressure, the discharge differences between the air and CO2 aeration series reduced, because the discharge rate had a larger promotion from atmospheric pressure to 400 kPa for the CO2 case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595799 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Novel process for 1 , 3 - dihydroxyacetone production from glycerol. 1. : Technological feasibility study and process design Type de document : texte imprimé Auteurs : Zhi Zheng, Auteur ; Min Luo, Auteur ; Jianer Yu, Auteur Année de publication : 2012 Article en page(s) : pp. 3715-3721 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Design Production Résumé : A novel and efficient conversion process of glycerol to 1,3-dihydroxyacetone (DHA) via indirect oxidation was developed. The idea is to oxidize the middle hydroxyl group of glycerol to a carbonyl group with the help of a group protection technique, and then the protection reagent is removed by hydrolysis. With this new process, the conversion is conducted in three steps, namely, acetalization, oxidation, and hydrolysis. The oxidation step is the focus of this conversion process. In our work, three oxidant systems (CrO3 anion resin oxidant system, TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)/NaBr/NaClO system, and TEMPO/NaBr/Air system) were experimentally examined to verify the feasibility of this new process. The process of this conversion is also preliminarily designed on the basis of the laboratory procedure described in the experimental section, which offers a potential foundation for the large-scale production of DHA from glycerol. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595800
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3715-3721[article] Novel process for 1 , 3 - dihydroxyacetone production from glycerol. 1. : Technological feasibility study and process design [texte imprimé] / Zhi Zheng, Auteur ; Min Luo, Auteur ; Jianer Yu, Auteur . - 2012 . - pp. 3715-3721.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3715-3721
Mots-clés : Design Production Résumé : A novel and efficient conversion process of glycerol to 1,3-dihydroxyacetone (DHA) via indirect oxidation was developed. The idea is to oxidize the middle hydroxyl group of glycerol to a carbonyl group with the help of a group protection technique, and then the protection reagent is removed by hydrolysis. With this new process, the conversion is conducted in three steps, namely, acetalization, oxidation, and hydrolysis. The oxidation step is the focus of this conversion process. In our work, three oxidant systems (CrO3 anion resin oxidant system, TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)/NaBr/NaClO system, and TEMPO/NaBr/Air system) were experimentally examined to verify the feasibility of this new process. The process of this conversion is also preliminarily designed on the basis of the laboratory procedure described in the experimental section, which offers a potential foundation for the large-scale production of DHA from glycerol. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595800 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Multimodel control of nonlinear systems : An integrated design procedure based on gap metric and H∞ loop shaping Type de document : texte imprimé Auteurs : Jingjing Du, Auteur ; Chunyue Song, Auteur ; Li Ping, Auteur Année de publication : 2012 Article en page(s) : pp. 3722-3731 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Integrated design Non linear system Résumé : An integrated multimodel control design procedure with its supporting gap metric based dividing algorithm is proposed, which integrates the multimodel decomposition and the local controller design of a nonlinear system through an improved gap metric based dividing algorithm and the H∞ loop-shaping technique. In this design procedure, desired local stability, static performance, and dynamic performance are incorporated into the system decomposition and local model set determination. Hence the closed-loop performance and stability are improved. Moreover, the right local model set for multimodel controller design is obtained, which avoids local model redundancy and simplifies the multimodel controller structure. Two nonlinear chemical systems are studied to illustrate the effectiveness of the proposed procedure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595801
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3722-3731[article] Multimodel control of nonlinear systems : An integrated design procedure based on gap metric and H∞ loop shaping [texte imprimé] / Jingjing Du, Auteur ; Chunyue Song, Auteur ; Li Ping, Auteur . - 2012 . - pp. 3722-3731.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3722-3731
Mots-clés : Integrated design Non linear system Résumé : An integrated multimodel control design procedure with its supporting gap metric based dividing algorithm is proposed, which integrates the multimodel decomposition and the local controller design of a nonlinear system through an improved gap metric based dividing algorithm and the H∞ loop-shaping technique. In this design procedure, desired local stability, static performance, and dynamic performance are incorporated into the system decomposition and local model set determination. Hence the closed-loop performance and stability are improved. Moreover, the right local model set for multimodel controller design is obtained, which avoids local model redundancy and simplifies the multimodel controller structure. Two nonlinear chemical systems are studied to illustrate the effectiveness of the proposed procedure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595801 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Optimization of Multitrain Brackish Water Reverse Osmosis (BWRO) Desalination Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 3732–3739 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization Optimal operation water Résumé : This work focuses on optimal operation of brackish water reverse osmosis (BWRO) plants employing multitrains which have different service times and membrane permeability parameters. A nonlinear optimization problem, based on a previously developed comprehensive RO model that accounts for characteristic curves of booster pumps driving the RO trains and pressure drop along each RO train, is formulated and solved to minimize the overall specific energy consumption (SEC) while maintaining the same overall water production. A 16–17% reduction in SEC is possible by optimizing production allocations among all trains as well as operating conditions within the normal pump operating range in each train. It is shown that optimizing each train individually (without optimizing production allocations) could yield a higher SEC. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202796u
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3732–3739[article] Optimization of Multitrain Brackish Water Reverse Osmosis (BWRO) Desalination [texte imprimé] . - 2012 . - pp. 3732–3739.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3732–3739
Mots-clés : Optimization Optimal operation water Résumé : This work focuses on optimal operation of brackish water reverse osmosis (BWRO) plants employing multitrains which have different service times and membrane permeability parameters. A nonlinear optimization problem, based on a previously developed comprehensive RO model that accounts for characteristic curves of booster pumps driving the RO trains and pressure drop along each RO train, is formulated and solved to minimize the overall specific energy consumption (SEC) while maintaining the same overall water production. A 16–17% reduction in SEC is possible by optimizing production allocations among all trains as well as operating conditions within the normal pump operating range in each train. It is shown that optimizing each train individually (without optimizing production allocations) could yield a higher SEC. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202796u Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Hexavalent chromium bioremoval through adaptation and consortia development from sukinda chromite mine isolates Type de document : texte imprimé Auteurs : Jastin Samuel, Auteur ; Madona L Paul, Auteur ; Mrudula Pulimi, Auteur Année de publication : 2012 Article en page(s) : pp. 3740-3749 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chromite mine isolates Résumé : Indigenous isolates from the waters of chromite mining sites at Sukinda Valley, Orissa, India, showed a considerable enhancement in Cr (VI) bioreduction rate through adaptation and consortia development. On the basis of 16S-rRNA sequencing, these isolates were identified as Bacillus subtilis VTTSUKMW1, Acinetobacter junii VITSUKMW2, and Escherichia coli VITSUKMW3. The native isolates showed a high tolerance at 500-1000 mg L―1 of Cr (VI). An increase in the reduction rate from 0.199-0.477 mg L―1 h―1 to 0.5-1.16 mg L―1 h―1 at 5-20 mg L―1 of initial Cr (VI) concentration was achieved by the adapted isolates. An increase in the growth rate and Cr (VI) reduction rate [0.86―2.6813 mg L―1 h―1 at 5―100 mg L―1 of initial Cr (VI) concentration] was observed in the ternary consortium of adapted isolates. The FT-IR spectra revealed the active participation of the bacterial surface groups in the reduction. The development of sequential processes (native → adapted → consortia) employing Cr (VI) tolerant isolates, proves to be a potential bioremediation strategy for specific chromite mine sites. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201796s
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3740-3749[article] Hexavalent chromium bioremoval through adaptation and consortia development from sukinda chromite mine isolates [texte imprimé] / Jastin Samuel, Auteur ; Madona L Paul, Auteur ; Mrudula Pulimi, Auteur . - 2012 . - pp. 3740-3749.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3740-3749
Mots-clés : Chromite mine isolates Résumé : Indigenous isolates from the waters of chromite mining sites at Sukinda Valley, Orissa, India, showed a considerable enhancement in Cr (VI) bioreduction rate through adaptation and consortia development. On the basis of 16S-rRNA sequencing, these isolates were identified as Bacillus subtilis VTTSUKMW1, Acinetobacter junii VITSUKMW2, and Escherichia coli VITSUKMW3. The native isolates showed a high tolerance at 500-1000 mg L―1 of Cr (VI). An increase in the reduction rate from 0.199-0.477 mg L―1 h―1 to 0.5-1.16 mg L―1 h―1 at 5-20 mg L―1 of initial Cr (VI) concentration was achieved by the adapted isolates. An increase in the growth rate and Cr (VI) reduction rate [0.86―2.6813 mg L―1 h―1 at 5―100 mg L―1 of initial Cr (VI) concentration] was observed in the ternary consortium of adapted isolates. The FT-IR spectra revealed the active participation of the bacterial surface groups in the reduction. The development of sequential processes (native → adapted → consortia) employing Cr (VI) tolerant isolates, proves to be a potential bioremediation strategy for specific chromite mine sites. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201796s Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Hydrotropic extraction of citral from cymbopogon flexuosus (Steud.) wats. Type de document : texte imprimé Auteurs : Meghal A. Desai, Auteur ; Jigisha Parikh, Auteur Année de publication : 2012 Article en page(s) : pp. 3750–3757 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrotropes Citral Résumé : A novel technique for the extraction of citral from the leaves of Cymbopogon flexuosus (Steud.) Wats. using hydrotropic solutions (sodium salicylate and sodium cumene sulfonate) was investigated. The yield of citral was dependent on the concentration of hydrotrope, solid loading, temperature, and size of the plant material. Using the Taguchi method, the extraction was optimized, and both the hydrotropes gave the highest yield of citral at a concentration of 1.75 M, 5% solid loading, a temperature of 30 °C, and a size of 0.25 mm of the plant material. Sodium salicylate gave a better extraction yield of citral than sodium cumene sulfonate. The microscopic analysis of plant leaves provided insight into the extraction mechanism. A kinetic study was carried out to check the extraction efficiency for both the hydrotropes. The hydrotropic solution was successfully recycled. Using hydrotropic extraction, citral could be extracted under normal operating conditions, and the use of traditional organic solvents could be eliminated. As a simple and environmentally friendly technique, hydrotropic extraction could be utilized for the extraction of bioactive compounds from plants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202025b
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3750–3757[article] Hydrotropic extraction of citral from cymbopogon flexuosus (Steud.) wats. [texte imprimé] / Meghal A. Desai, Auteur ; Jigisha Parikh, Auteur . - 2012 . - pp. 3750–3757.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3750–3757
Mots-clés : Hydrotropes Citral Résumé : A novel technique for the extraction of citral from the leaves of Cymbopogon flexuosus (Steud.) Wats. using hydrotropic solutions (sodium salicylate and sodium cumene sulfonate) was investigated. The yield of citral was dependent on the concentration of hydrotrope, solid loading, temperature, and size of the plant material. Using the Taguchi method, the extraction was optimized, and both the hydrotropes gave the highest yield of citral at a concentration of 1.75 M, 5% solid loading, a temperature of 30 °C, and a size of 0.25 mm of the plant material. Sodium salicylate gave a better extraction yield of citral than sodium cumene sulfonate. The microscopic analysis of plant leaves provided insight into the extraction mechanism. A kinetic study was carried out to check the extraction efficiency for both the hydrotropes. The hydrotropic solution was successfully recycled. Using hydrotropic extraction, citral could be extracted under normal operating conditions, and the use of traditional organic solvents could be eliminated. As a simple and environmentally friendly technique, hydrotropic extraction could be utilized for the extraction of bioactive compounds from plants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202025b Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Crystallization of RDX by drowning - out combined with fines dissolution and cooling process Type de document : texte imprimé Auteurs : Jun-Woo Kim, Auteur ; Dhan Bee Park, Auteur ; Hong-Min Shim, Auteur Année de publication : 2012 Article en page(s) : pp. 3758–3765 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallization Résumé : A new process of drowning-out combined with fines dissolution and cooling crystallization (the DFC process) was proposed to recover 1,3,5-trinitro-1,3,5-triazinane (RDX) from RDX/γ-butyrolactone solution with relatively large crystal size and high yield. In this process, fine crystals induced by drowning-out are dissolved into the solution by heating so that the dissolved solute can contribute to grow seed crystals by cooling. The DFC process is repeated to reach the desired yield. Estimation of the amount of antisolvent for drowning-out is made by a simple mass balance model in which the mass of fine particles produced by drowning-out equals to that dissolved. Considering dissolution of seeds at the fines dissolution stage, an empirical parameter α which is smaller than 1 was employed for the estimation of the optimum amount of antisolvent added. α = 1 indicates that effect of dissolution of seeds is negligible. In the present work, initial seeds were prepared by rapid injection of 15 g of water into a saturated RDX/γ-butyrolactone solution of 30 °C. Heating temperature for fines dissolution and cooling temperature for further crystal growth were 40 and 20 °C, respectively. In those operating conditions with α = 0.8, the average crystal size of RDX with the yield of 90% was 67.6 μm, which was a remarkably improved result when compared with that of 40.4 μm by drowning-out only. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202562u
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3758–3765[article] Crystallization of RDX by drowning - out combined with fines dissolution and cooling process [texte imprimé] / Jun-Woo Kim, Auteur ; Dhan Bee Park, Auteur ; Hong-Min Shim, Auteur . - 2012 . - pp. 3758–3765.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3758–3765
Mots-clés : Crystallization Résumé : A new process of drowning-out combined with fines dissolution and cooling crystallization (the DFC process) was proposed to recover 1,3,5-trinitro-1,3,5-triazinane (RDX) from RDX/γ-butyrolactone solution with relatively large crystal size and high yield. In this process, fine crystals induced by drowning-out are dissolved into the solution by heating so that the dissolved solute can contribute to grow seed crystals by cooling. The DFC process is repeated to reach the desired yield. Estimation of the amount of antisolvent for drowning-out is made by a simple mass balance model in which the mass of fine particles produced by drowning-out equals to that dissolved. Considering dissolution of seeds at the fines dissolution stage, an empirical parameter α which is smaller than 1 was employed for the estimation of the optimum amount of antisolvent added. α = 1 indicates that effect of dissolution of seeds is negligible. In the present work, initial seeds were prepared by rapid injection of 15 g of water into a saturated RDX/γ-butyrolactone solution of 30 °C. Heating temperature for fines dissolution and cooling temperature for further crystal growth were 40 and 20 °C, respectively. In those operating conditions with α = 0.8, the average crystal size of RDX with the yield of 90% was 67.6 μm, which was a remarkably improved result when compared with that of 40.4 μm by drowning-out only. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202562u Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Phase segregation and gas separation properties of thermally treated copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines Type de document : texte imprimé Auteurs : Alberto Tena, Auteur ; Angel Marcos-Fernandez, Auteur ; Laura Palacio, Auteur Année de publication : 2012 Article en page(s) : pp. 3766–3775 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas Phase segregation processes Résumé : Copoly(ether-imide)s formed by the reaction of an aromatic dianhydride (BPDA), an aromatic diamine (ODA), and various aliphatic diamines (PEO-2000, PPO-2000, RT-1000, pTHF-1700, and pTHF-350) have been obtained. These copolymers underwent phase segregation processes, as confirmed by small-angle X-ray scattering (SAXS), when they were thermally treated. Gas permeabilities of these materials depended on the phase separation. Thus, a linear relationship between gas permeability and increasing percentage and size of the domains of the segregated phase has been obtained. The differences in the degree of segregation have been examined for the different aliphatic diamines used in the synthesis of the copolymers. The effect of polarity, length, and structure of the chain were examined in terms of permeability for the gases O2, N2, CO2, and CH4. It has been shown that long aliphatic chains with adequate polarity and the ability to interact with and enhance the condensation of a certain gas give better materials. Improved selectivities, approaching the Robeson limit, were seen as a consequence of the thermal treatment. Also, an interesting reverse selectivity has been observed for the mixture CH4/N2, probably due to a combined effect of a specific interaction and an increase in solubility of CH4 in the soft segregated portions of the copolymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028443
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3766–3775[article] Phase segregation and gas separation properties of thermally treated copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines [texte imprimé] / Alberto Tena, Auteur ; Angel Marcos-Fernandez, Auteur ; Laura Palacio, Auteur . - 2012 . - pp. 3766–3775.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3766–3775
Mots-clés : Gas Phase segregation processes Résumé : Copoly(ether-imide)s formed by the reaction of an aromatic dianhydride (BPDA), an aromatic diamine (ODA), and various aliphatic diamines (PEO-2000, PPO-2000, RT-1000, pTHF-1700, and pTHF-350) have been obtained. These copolymers underwent phase segregation processes, as confirmed by small-angle X-ray scattering (SAXS), when they were thermally treated. Gas permeabilities of these materials depended on the phase separation. Thus, a linear relationship between gas permeability and increasing percentage and size of the domains of the segregated phase has been obtained. The differences in the degree of segregation have been examined for the different aliphatic diamines used in the synthesis of the copolymers. The effect of polarity, length, and structure of the chain were examined in terms of permeability for the gases O2, N2, CO2, and CH4. It has been shown that long aliphatic chains with adequate polarity and the ability to interact with and enhance the condensation of a certain gas give better materials. Improved selectivities, approaching the Robeson limit, were seen as a consequence of the thermal treatment. Also, an interesting reverse selectivity has been observed for the mixture CH4/N2, probably due to a combined effect of a specific interaction and an increase in solubility of CH4 in the soft segregated portions of the copolymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2028443 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Application of iron - containing magnetic ionic liquids in extraction process of coal direct liquefaction residues Type de document : texte imprimé Auteurs : Jieli Wang, Auteur ; Hongwei Yao, Auteur ; Yi Nie, Auteur Année de publication : 2012 Article en page(s) : pp. 3776-3782 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquefaction Coal Extraction process Ionic liquid Résumé : Three kinds of iron-containing magnetic ionic liquids (ILs), including imidazole-based, pyridine-based, and pyrrolidine-based ILs, were synthesized respectively, and were used to dissolve coal direct liquefaction residues (CDLR) to obtain asphaltene fractions under the conditions of given time, temperature, and mass ratio of ILs to CDLR. The extracts from CDLR were characterized by ultimate analysis, proximate analysis, FT-IR, and I3C NMR. The results show that physicochemical properties of the extracts obtained with different magnetic ILs consisting of different cationic rings are different, and pyridine-based magnetic IL is an effective extractant to extract asphaltenes from CDLR among the three magnetic IIs. The extracts might be good precursors for preparing high-value-added carbon materials because of their higher carbon content, lower H/C, and ash content. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595807
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3776-3782[article] Application of iron - containing magnetic ionic liquids in extraction process of coal direct liquefaction residues [texte imprimé] / Jieli Wang, Auteur ; Hongwei Yao, Auteur ; Yi Nie, Auteur . - 2012 . - pp. 3776-3782.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3776-3782
Mots-clés : Liquefaction Coal Extraction process Ionic liquid Résumé : Three kinds of iron-containing magnetic ionic liquids (ILs), including imidazole-based, pyridine-based, and pyrrolidine-based ILs, were synthesized respectively, and were used to dissolve coal direct liquefaction residues (CDLR) to obtain asphaltene fractions under the conditions of given time, temperature, and mass ratio of ILs to CDLR. The extracts from CDLR were characterized by ultimate analysis, proximate analysis, FT-IR, and I3C NMR. The results show that physicochemical properties of the extracts obtained with different magnetic ILs consisting of different cationic rings are different, and pyridine-based magnetic IL is an effective extractant to extract asphaltenes from CDLR among the three magnetic IIs. The extracts might be good precursors for preparing high-value-added carbon materials because of their higher carbon content, lower H/C, and ash content. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595807 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Solubility and self - consistent modeling of aniline hydrochloride in H – Mg – Na – Ca – Al – Cl – H2O system at the temperature range of 288 – 348 K Type de document : texte imprimé Auteurs : Shunping Sun, Auteur ; Junfeng Wang, Auteur ; Zhibao Li, Auteur Année de publication : 2012 Article en page(s) : pp. 3783–3790 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrochloric acid Résumé : Previous work has proved that the preparation method of anhydrous magnesium chloride by using the thermal decomposition of the complex [HAE]Cl·MgCl2·6H2O is a potential process for commercial application. Normally, the complex [HAE]Cl·MgCl2·6H2O is synthesized by reaction crystallization of aniline hydrochloride (C6H5NH2·HCl, [HAE]Cl) and bischofite (MgCl2·6H2O). The study on the solubility of [HAE]Cl in hydrochloric acid and various chloride salt solutions plays a significant role in the development, analysis, and engineering design for this new process. This work is a continuation of our systematic study of the solubility of [HAE]Cl in different chloride media. The solubility of [HAE]Cl in different concentrations of HCl (1.19–6.98 mol·kg–1), NaCl (0.5–3.8 mol·kg–1), CaCl2 (0.5–4.5 mol·kg–1), AlCl3 (0.5–2.8 mol·kg–1), and their mixed solutions was determined using a dynamic method in the temperature range from 288 to 348 K. With the purpose of improving AspenPlus’s prediction capability, in regard to [HAE]Cl solubility data in the H–Mg–Na–Ca–Al–Cl–H2O systems at various temperatures, new model parameters were obtained via the regression of the experimental solubility of [HAE]Cl in single electrolyte solutions, such as HCl, NaCl, CaCl2, and AlCl3, under atmospheric pressure. With the newly obtained electrolyte NRTL (ENRTL) interaction parameters for [HAE]Cl–NaCl, [HAE]Cl–CaCl2, [HAE]Cl–AlCl3, and AlCl3–H2O, and default parameters for NaCl–H2O and CaCl2–H2O in AspenPlus, a self-consistent model for the system [HAE]–H–Mg–Na–Ca–Al–Cl–H2O was established with the maximum relative deviation of 4.3% between experimental and predicted solubility values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013949
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3783–3790[article] Solubility and self - consistent modeling of aniline hydrochloride in H – Mg – Na – Ca – Al – Cl – H2O system at the temperature range of 288 – 348 K [texte imprimé] / Shunping Sun, Auteur ; Junfeng Wang, Auteur ; Zhibao Li, Auteur . - 2012 . - pp. 3783–3790.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3783–3790
Mots-clés : Hydrochloric acid Résumé : Previous work has proved that the preparation method of anhydrous magnesium chloride by using the thermal decomposition of the complex [HAE]Cl·MgCl2·6H2O is a potential process for commercial application. Normally, the complex [HAE]Cl·MgCl2·6H2O is synthesized by reaction crystallization of aniline hydrochloride (C6H5NH2·HCl, [HAE]Cl) and bischofite (MgCl2·6H2O). The study on the solubility of [HAE]Cl in hydrochloric acid and various chloride salt solutions plays a significant role in the development, analysis, and engineering design for this new process. This work is a continuation of our systematic study of the solubility of [HAE]Cl in different chloride media. The solubility of [HAE]Cl in different concentrations of HCl (1.19–6.98 mol·kg–1), NaCl (0.5–3.8 mol·kg–1), CaCl2 (0.5–4.5 mol·kg–1), AlCl3 (0.5–2.8 mol·kg–1), and their mixed solutions was determined using a dynamic method in the temperature range from 288 to 348 K. With the purpose of improving AspenPlus’s prediction capability, in regard to [HAE]Cl solubility data in the H–Mg–Na–Ca–Al–Cl–H2O systems at various temperatures, new model parameters were obtained via the regression of the experimental solubility of [HAE]Cl in single electrolyte solutions, such as HCl, NaCl, CaCl2, and AlCl3, under atmospheric pressure. With the newly obtained electrolyte NRTL (ENRTL) interaction parameters for [HAE]Cl–NaCl, [HAE]Cl–CaCl2, [HAE]Cl–AlCl3, and AlCl3–H2O, and default parameters for NaCl–H2O and CaCl2–H2O in AspenPlus, a self-consistent model for the system [HAE]–H–Mg–Na–Ca–Al–Cl–H2O was established with the maximum relative deviation of 4.3% between experimental and predicted solubility values. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013949 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Inlet cone effect on particulate matter deposition and regeneration temperature in a diesel particulate filter Type de document : texte imprimé Auteurs : Mengting Yu, Auteur ; Dan Luss, Auteur Année de publication : 2012 Article en page(s) : pp. 3791-3800 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Diesel particulate Résumé : A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the effluent of a diesel engine. A major technological challenge in the operation of the ceramic cordierite filter is to prevent formation of local high temperatures that can melt the DPF or generate a thermal stress that may cause cracking. Most previous studies of the temperature rise during the DPF periodic regeneration (combustion of the deposited PM) considered cases in which the inlet velocity to all the parallel channels was uniform. A wide-angled cone (diffuser) is sometimes used to connect the diesel engine exhaust pipe to the DPF leading to a nonuniform velocity to the inlet channels, with the highest attained at the DPF center. We used a PM deposition and regeneration computational model to investigate the impact of the inlet cone on the DPF behavior under stationary feed conditions. The cone led to mal-distribution of the deposited PM, with the highest thickness in the DPF center. The highest regeneration temperature when using an inlet cone may be quite higher than when it is absent. Moreover, the inlet cone can generate higher temperature gradients and the resulting thermal stresses may crack the ceramic support. The largest radial thermal gradients are encountered dose to the wall in the downstream section of DPF, shortly after the temperature inside the filter reaches its peak. The cone leads to a slightly faster regeneration than when it is not used. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202226r
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3791-3800[article] Inlet cone effect on particulate matter deposition and regeneration temperature in a diesel particulate filter [texte imprimé] / Mengting Yu, Auteur ; Dan Luss, Auteur . - 2012 . - pp. 3791-3800.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3791-3800
Mots-clés : Diesel particulate Résumé : A diesel particulate filter (DPF) is used to remove particulate matter (PM) from the effluent of a diesel engine. A major technological challenge in the operation of the ceramic cordierite filter is to prevent formation of local high temperatures that can melt the DPF or generate a thermal stress that may cause cracking. Most previous studies of the temperature rise during the DPF periodic regeneration (combustion of the deposited PM) considered cases in which the inlet velocity to all the parallel channels was uniform. A wide-angled cone (diffuser) is sometimes used to connect the diesel engine exhaust pipe to the DPF leading to a nonuniform velocity to the inlet channels, with the highest attained at the DPF center. We used a PM deposition and regeneration computational model to investigate the impact of the inlet cone on the DPF behavior under stationary feed conditions. The cone led to mal-distribution of the deposited PM, with the highest thickness in the DPF center. The highest regeneration temperature when using an inlet cone may be quite higher than when it is absent. Moreover, the inlet cone can generate higher temperature gradients and the resulting thermal stresses may crack the ceramic support. The largest radial thermal gradients are encountered dose to the wall in the downstream section of DPF, shortly after the temperature inside the filter reaches its peak. The cone leads to a slightly faster regeneration than when it is not used. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202226r Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Disturbances in the hydrodynamic behavior of a spouted bed caused by an optical fiber probe : Experimental and CFD study Type de document : texte imprimé Auteurs : Dyrney A. Santos, Auteur ; Gustavo C. Alves, Auteur ; Claudio R. Duarte, Auteur Année de publication : 2012 Article en page(s) : pp. 3801-3810 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Computational fluid dynamics Fiber optic sensors Fluidization Spouted bed Hydrodynamics Résumé : In this work the disturbances in the hydrodynamic behavior caused by the use of an optical fiber probe in a conical-cylindrical spouted bed have been analyzed based on experimental results and CFD simulations using an Eulerian-Eulerian multiphase model. The insertion of the probe inside the spouted bed caused a decrease in the fountain height and in the particle velocity for the spout region. The CFD simulations using the Representative Unit Cell model (RUC) drag model and considering the presence of the probe predicted better the experimental data of the particle velocity distribution than the other simulations performed in this work with other drag models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595810
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3801-3810[article] Disturbances in the hydrodynamic behavior of a spouted bed caused by an optical fiber probe : Experimental and CFD study [texte imprimé] / Dyrney A. Santos, Auteur ; Gustavo C. Alves, Auteur ; Claudio R. Duarte, Auteur . - 2012 . - pp. 3801-3810.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3801-3810
Mots-clés : Computational fluid dynamics Fiber optic sensors Fluidization Spouted bed Hydrodynamics Résumé : In this work the disturbances in the hydrodynamic behavior caused by the use of an optical fiber probe in a conical-cylindrical spouted bed have been analyzed based on experimental results and CFD simulations using an Eulerian-Eulerian multiphase model. The insertion of the probe inside the spouted bed caused a decrease in the fountain height and in the particle velocity for the spout region. The CFD simulations using the Representative Unit Cell model (RUC) drag model and considering the presence of the probe predicted better the experimental data of the particle velocity distribution than the other simulations performed in this work with other drag models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595810 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Preparation of Polyaniline/Multiwalled Carbon Nanotubes Nanocomposites by High Gravity Chemical Oxidative Polymerization Type de document : texte imprimé Auteurs : Yi-bo Zhao, Auteur ; Wei, Wu, Auteur ; Jian-feng Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 3801-3810 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Computational fluid dynamics Fiber optic sensors FluidizationSpouted bed Hydrodynamics Résumé : In this work the disturbances in the hydrodynamic behavior caused by the use of an optical fiber probe in a conical-cylindrical spouted bed have been analyzed based on experimental results and CFD simulations using an Eulerian-Eulerian multiphase model. The insertion of the probe inside the spouted bed caused a decrease in the fountain height and in the particle velocity for the spout region. The CFD simulations using the Representative Unit Cell model (RUC) drag model and considering the presence of the probe predicted better the experimental data of the particle velocity distribution than the other simulations performed in this work with other drag models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595810
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3801-3810[article] Preparation of Polyaniline/Multiwalled Carbon Nanotubes Nanocomposites by High Gravity Chemical Oxidative Polymerization [texte imprimé] / Yi-bo Zhao, Auteur ; Wei, Wu, Auteur ; Jian-feng Chen, Auteur . - 2012 . - pp. 3801-3810.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3801-3810
Mots-clés : Computational fluid dynamics Fiber optic sensors FluidizationSpouted bed Hydrodynamics Résumé : In this work the disturbances in the hydrodynamic behavior caused by the use of an optical fiber probe in a conical-cylindrical spouted bed have been analyzed based on experimental results and CFD simulations using an Eulerian-Eulerian multiphase model. The insertion of the probe inside the spouted bed caused a decrease in the fountain height and in the particle velocity for the spout region. The CFD simulations using the Representative Unit Cell model (RUC) drag model and considering the presence of the probe predicted better the experimental data of the particle velocity distribution than the other simulations performed in this work with other drag models. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595810 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Experimental data assessment test for composition of vapor phase in equilibrium with gas hydrate and liquid water for carbon dioxide + methane or nitrogen + water system Type de document : texte imprimé Auteurs : Ali Eslamimanesh, Auteur ; Saeedeh Babaee, Auteur ; Amir H. Mohammadi, Auteur Année de publication : 2012 Article en page(s) : pp. 3819-3825 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon dioxide Gas hydrates Résumé : Accurate knowledge of the compositions of the equilibrium phases in the systems containing gas hydrates is essential for many hydrate-based separation processes. Unfortunately, there are limited sets of such experimental data available in the literature partly due to the difficulties in measurements of the compositions of the phases in equilibrium with gas hydrate. Consequently, satisfactory accuracy of the measurements may not be obvious. Therefore, reliability of the corresponding data should be checked prior to their further applications. In this article, we present a thermodynamic assessment test (consistency test) based on the area test approach for the experimental compositional data of vapor phase in equilibrium with gas hydrate + liquid water for the carbon dioxide + methane or nitrogen + water system. The van der Waals and Platteeuw (vdW-P) solid solution theory is used to model the hydrate phase, and the Valderrama―Patel―Teja equation of state (VPT-EoS) along with the nondensity dependent (NDD) mixing rule is applied to deal with the fluid phases. The results show that only one of the studied experimental data sets seems to be thermodynamically consistent, and the rest of the data seem to be either not fully consistent or inconsistent. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595812
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3819-3825[article] Experimental data assessment test for composition of vapor phase in equilibrium with gas hydrate and liquid water for carbon dioxide + methane or nitrogen + water system [texte imprimé] / Ali Eslamimanesh, Auteur ; Saeedeh Babaee, Auteur ; Amir H. Mohammadi, Auteur . - 2012 . - pp. 3819-3825.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3819-3825
Mots-clés : Carbon dioxide Gas hydrates Résumé : Accurate knowledge of the compositions of the equilibrium phases in the systems containing gas hydrates is essential for many hydrate-based separation processes. Unfortunately, there are limited sets of such experimental data available in the literature partly due to the difficulties in measurements of the compositions of the phases in equilibrium with gas hydrate. Consequently, satisfactory accuracy of the measurements may not be obvious. Therefore, reliability of the corresponding data should be checked prior to their further applications. In this article, we present a thermodynamic assessment test (consistency test) based on the area test approach for the experimental compositional data of vapor phase in equilibrium with gas hydrate + liquid water for the carbon dioxide + methane or nitrogen + water system. The van der Waals and Platteeuw (vdW-P) solid solution theory is used to model the hydrate phase, and the Valderrama―Patel―Teja equation of state (VPT-EoS) along with the nondensity dependent (NDD) mixing rule is applied to deal with the fluid phases. The results show that only one of the studied experimental data sets seems to be thermodynamically consistent, and the rest of the data seem to be either not fully consistent or inconsistent. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595812 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Corresponding states method for evaluation of the solubility parameters of chemical compounds Type de document : texte imprimé Auteurs : Farhad Gharagheizi, Auteur ; Ali Eslamimanesh, Auteur ; Sattari, Mehdi, Auteur Année de publication : 2012 Article en page(s) : pp. 3826-3831 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chemical compound Solubility Résumé : In this study, our objective is to apply the gene expression programming mathematical algorithm to propose a correlation based on the corresponding states method to determine the solubility parameters of 1641 pure compounds (mostly organic ones) at 298.15 K and atmospheric pressure. The studied compounds are from the 80 chemical families. The parameters of the method include the critical temperature, critical pressure, molecular weight, and acentric factor. Around 1477 solubility parameter data are randomly selected for developing (training + optimization) the correlation, and about 164 data are used for checking its prediction capability. The obtained statistical parameters, including average absolute relative deviation of the results from the applied data (about 6%), show the accuracy of the proposed method along with its simplicity and wide range of applicability. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595813
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3826-3831[article] Corresponding states method for evaluation of the solubility parameters of chemical compounds [texte imprimé] / Farhad Gharagheizi, Auteur ; Ali Eslamimanesh, Auteur ; Sattari, Mehdi, Auteur . - 2012 . - pp. 3826-3831.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3826-3831
Mots-clés : Chemical compound Solubility Résumé : In this study, our objective is to apply the gene expression programming mathematical algorithm to propose a correlation based on the corresponding states method to determine the solubility parameters of 1641 pure compounds (mostly organic ones) at 298.15 K and atmospheric pressure. The studied compounds are from the 80 chemical families. The parameters of the method include the critical temperature, critical pressure, molecular weight, and acentric factor. Around 1477 solubility parameter data are randomly selected for developing (training + optimization) the correlation, and about 164 data are used for checking its prediction capability. The obtained statistical parameters, including average absolute relative deviation of the results from the applied data (about 6%), show the accuracy of the proposed method along with its simplicity and wide range of applicability. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595813 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Density - functional theory for polymer – carbon dioxide mixtures Type de document : texte imprimé Auteurs : Xiaofei Xu, Auteur ; Diego E. Cristancho, Auteur ; Stéphane Costeux, Auteur Année de publication : 2012 Article en page(s) : pp. 3832–3840 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer Carbon Dioxide Résumé : We propose a new density-functional theory (DFT) describing inhomogeneous polymer–carbon dioxide (CO2) mixtures. The theory is constructed by combining the bulk Peng–Robinson equation of state (PR-EOS) with the statistical associating fluid theory (SAFT) and the fundamental measure theory (FMT). The weight density functions from FMT are used to extend the bulk excess Helmholtz free energy of PR-EOS to the inhomogeneous case, while the SAFT is used to describe correlations due to polymer chain connectivity and short-range forces due to weakly polar or association interactions. The additional long-range dispersion contributions are included using a mean-field approach. We apply our DFT to the interfacial properties of polystyrene–CO2 and poly(methyl methacrylate)–CO2 systems. The calculated interfacial tension values are in good agreement with experimental data at low to intermediate pressures. The inclusion of association energy for CO2 is shown to have a significant effect. We also point out the limitation of the PR-EOS for describing polymer–CO2 mixtures at high pressures (P > 35 MPa). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2029267
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3832–3840[article] Density - functional theory for polymer – carbon dioxide mixtures [texte imprimé] / Xiaofei Xu, Auteur ; Diego E. Cristancho, Auteur ; Stéphane Costeux, Auteur . - 2012 . - pp. 3832–3840.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3832–3840
Mots-clés : Polymer Carbon Dioxide Résumé : We propose a new density-functional theory (DFT) describing inhomogeneous polymer–carbon dioxide (CO2) mixtures. The theory is constructed by combining the bulk Peng–Robinson equation of state (PR-EOS) with the statistical associating fluid theory (SAFT) and the fundamental measure theory (FMT). The weight density functions from FMT are used to extend the bulk excess Helmholtz free energy of PR-EOS to the inhomogeneous case, while the SAFT is used to describe correlations due to polymer chain connectivity and short-range forces due to weakly polar or association interactions. The additional long-range dispersion contributions are included using a mean-field approach. We apply our DFT to the interfacial properties of polystyrene–CO2 and poly(methyl methacrylate)–CO2 systems. The calculated interfacial tension values are in good agreement with experimental data at low to intermediate pressures. The inclusion of association energy for CO2 is shown to have a significant effect. We also point out the limitation of the PR-EOS for describing polymer–CO2 mixtures at high pressures (P > 35 MPa). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2029267 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Phase equilibria of clathrate hydrates of methane + n - propyl mercaptan or n - butyl mercaptan + water system Type de document : texte imprimé Auteurs : Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur Année de publication : 2012 Article en page(s) : pp. 3841-3843 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Clathrate Phase equilibrium Résumé : In this work, we report dissociation pressures for clathrate hydrates of the methane + n-propyl mercaptan + water and methane + n-butyl mercaptan + water systems in the temperature ranges of 282.3-289.9 K and 279.4―287.4 K, respectively. The experimental data were measured using an isochoric pressure search method. The hydrate dissociation data for both measured systems are compared with some selected literature data for the dissociation conditions of methane clathrate hydrates. It is shown that n-propyl mercaptan has a thermodynamic promotion effect on methane clathrate hydrates while n-butyl mercaptan has a negligible effect. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595815
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3841-3843[article] Phase equilibria of clathrate hydrates of methane + n - propyl mercaptan or n - butyl mercaptan + water system [texte imprimé] / Amir H. Mohammadi, Auteur ; Dominique Richon, Auteur . - 2012 . - pp. 3841-3843.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3841-3843
Mots-clés : Clathrate Phase equilibrium Résumé : In this work, we report dissociation pressures for clathrate hydrates of the methane + n-propyl mercaptan + water and methane + n-butyl mercaptan + water systems in the temperature ranges of 282.3-289.9 K and 279.4―287.4 K, respectively. The experimental data were measured using an isochoric pressure search method. The hydrate dissociation data for both measured systems are compared with some selected literature data for the dissociation conditions of methane clathrate hydrates. It is shown that n-propyl mercaptan has a thermodynamic promotion effect on methane clathrate hydrates while n-butyl mercaptan has a negligible effect. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595815 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
Titre : Evaluation of thermal conductivity of gases at atmospheric pressure through a corresponding states method Type de document : texte imprimé Auteurs : Farhad Gharagheizi, Auteur ; Ali Eslamimanesh, Auteur ; Sattari, Mehdi, Auteur Année de publication : 2012 Article en page(s) : pp. 3844-3849 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Atmospheric pressure Thermal conductivity Résumé : In the present communication, we propose a corresponding states method for calculation/estimation of the vapor thermal conductivity of chemical compounds (mostly organic), applying the gene expression programming (GEP) algorithm. Around 16000 thermal conductivity data of gases at various temperatures from 100 to 1500 K and atmospheric pressure related to about 1600 chemical compounds (mostly organic) are used for development and validation of the method. The quantities used in the corresponding states correlation include temperature, critical pressure, molecular weight, acentric factor, and normal boiling point. More than 14000 thermal conductivity data are randomly selected for developing (training + optimizing) the correlation, and about 1600 data are used for checking its prediction capability. The obtained statistical parameters including average absolute relative deviation of the results from the applied data (about 8%) show acceptable accuracy of the presented method. The most important features of the developed model are its simplicity, its wide range of applicability, and its validity based on the Leverage value test. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595816
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3844-3849[article] Evaluation of thermal conductivity of gases at atmospheric pressure through a corresponding states method [texte imprimé] / Farhad Gharagheizi, Auteur ; Ali Eslamimanesh, Auteur ; Sattari, Mehdi, Auteur . - 2012 . - pp. 3844-3849.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3844-3849
Mots-clés : Atmospheric pressure Thermal conductivity Résumé : In the present communication, we propose a corresponding states method for calculation/estimation of the vapor thermal conductivity of chemical compounds (mostly organic), applying the gene expression programming (GEP) algorithm. Around 16000 thermal conductivity data of gases at various temperatures from 100 to 1500 K and atmospheric pressure related to about 1600 chemical compounds (mostly organic) are used for development and validation of the method. The quantities used in the corresponding states correlation include temperature, critical pressure, molecular weight, acentric factor, and normal boiling point. More than 14000 thermal conductivity data are randomly selected for developing (training + optimizing) the correlation, and about 1600 data are used for checking its prediction capability. The obtained statistical parameters including average absolute relative deviation of the results from the applied data (about 8%) show acceptable accuracy of the presented method. The most important features of the developed model are its simplicity, its wide range of applicability, and its validity based on the Leverage value test. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25595816 Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire
