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Vol. 51 N° 47 - Novembre 2012 [texte imprimé] . - 2013 . - p. 15299-15536 : ill. ; 28 cm. Chemical engineering Langues : Anglais (eng)
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Ajouter le résultat dans votre panierApplication of coal fly ash in air quality management / M. Ahmaruzzaman in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012)
Titre : Application of coal fly ash in air quality management Type de document : texte imprimé Auteurs : M. Ahmaruzzaman, Auteur ; V.K Gupta, Auteur Année de publication : 2013 Article en page(s) : pp. 15299-15314 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Air quality Fly ash Coal Résumé : Although, coal fly ash is recognized as an environmental pollutant, it can be used for the removal of various gaseous pollutants under controlled conditions. A lot of work has been conducted worldwide for the utilization of fly ash for various applications. It has been found from the literature that fly ash possesses potential application in the management of air quality. The literature data revealed that fly ash can be utilized for the removal of NOx, SOx, mercury, and other gaseous pollutants from air and other sources. Fly ash can be used as a promising sorbent for the removal of various types of air pollutants; however, further research need to be taken in the laboratory and pilot plant scale. It is also indicated that fly ash contained approximately 10―12% of unburned component and these unburned components may have an important role in their removal capacity. In this article, the application of fly ash in the removal of SOx, NOx, mercury, gaseous organics, and other impurities have been discussed and some guidelines have been highlighted for their potential application. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679651
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15299-15314[article] Application of coal fly ash in air quality management [texte imprimé] / M. Ahmaruzzaman, Auteur ; V.K Gupta, Auteur . - 2013 . - pp. 15299-15314.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15299-15314
Mots-clés : Air quality Fly ash Coal Résumé : Although, coal fly ash is recognized as an environmental pollutant, it can be used for the removal of various gaseous pollutants under controlled conditions. A lot of work has been conducted worldwide for the utilization of fly ash for various applications. It has been found from the literature that fly ash possesses potential application in the management of air quality. The literature data revealed that fly ash can be utilized for the removal of NOx, SOx, mercury, and other gaseous pollutants from air and other sources. Fly ash can be used as a promising sorbent for the removal of various types of air pollutants; however, further research need to be taken in the laboratory and pilot plant scale. It is also indicated that fly ash contained approximately 10―12% of unburned component and these unburned components may have an important role in their removal capacity. In this article, the application of fly ash in the removal of SOx, NOx, mercury, gaseous organics, and other impurities have been discussed and some guidelines have been highlighted for their potential application. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679651 Exemplaires
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Titre : Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper Type de document : texte imprimé Auteurs : Mohammad Outokesh, Auteur ; Arezoo Saket, Auteur ; Seyed Javad Ahmadi, Auteur Année de publication : 2013 Article en page(s) : pp. 15315-15323 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanoparticle Adsorption Comparative study Résumé : The current study is aimed at comparison of adsorption behaviors of silica-supported Cu nanopartides (Si―N― Cu) and micrometric copper powder (Mi-Cu) for uptake of iodine vapor. The Si-N-Cu was synthesized by the decomposition of aqueous Cu(NO3)2 solution at supercritical condition, followed by reduction of the sample by H2―N2 mixture. The Si-N-Cu sample with 29.4 nm Cu particles adsorbed 95% of I2 at partial pressure 10―5 bar in 1 h, while the 1 μm Mi-Cu adsorbed 51% of iodine in 6 h, indicating higher yield and faster kinetics of the nanometric sample. Theoretical analysis revealed the existence of a strong thermodynamic size effect in the Cu―I2 reaction system, so that molar |ΔG| for 2 nm Cu particles was 2.5 times larger than |ΔG| for 1 μm particles. For the Mi-Cu, kinetics obeyed a three-dimensional diffusion model, while in the case of Si―N―Cu, diffusion did not play any role in the kinetics. Apparently, no passivation mechanism was operative in the iodination. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679652
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15315-15323[article] Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper [texte imprimé] / Mohammad Outokesh, Auteur ; Arezoo Saket, Auteur ; Seyed Javad Ahmadi, Auteur . - 2013 . - pp. 15315-15323.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15315-15323
Mots-clés : Nanoparticle Adsorption Comparative study Résumé : The current study is aimed at comparison of adsorption behaviors of silica-supported Cu nanopartides (Si―N― Cu) and micrometric copper powder (Mi-Cu) for uptake of iodine vapor. The Si-N-Cu was synthesized by the decomposition of aqueous Cu(NO3)2 solution at supercritical condition, followed by reduction of the sample by H2―N2 mixture. The Si-N-Cu sample with 29.4 nm Cu particles adsorbed 95% of I2 at partial pressure 10―5 bar in 1 h, while the 1 μm Mi-Cu adsorbed 51% of iodine in 6 h, indicating higher yield and faster kinetics of the nanometric sample. Theoretical analysis revealed the existence of a strong thermodynamic size effect in the Cu―I2 reaction system, so that molar |ΔG| for 2 nm Cu particles was 2.5 times larger than |ΔG| for 1 μm particles. For the Mi-Cu, kinetics obeyed a three-dimensional diffusion model, while in the case of Si―N―Cu, diffusion did not play any role in the kinetics. Apparently, no passivation mechanism was operative in the iodination. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679652 Exemplaires
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Titre : Enhancement of Removal rate of an organic pollutant in the presence of immobilized TiO2 nanoparticles with inorganic anions combination : Optimization using taguchi approach Type de document : texte imprimé Auteurs : Mohammad A. Behnajady, Auteur ; Mahsa Hajiahmadi, Auteur ; Nasser Modirshahla, Auteur Année de publication : 2013 Article en page(s) : pp. 15324–15330 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Organic pollutant Nanoparticles Optimization Résumé : In this paper, the effect of various inorganic anions, NO3–, HCO3–, SO42–, Cl–, and H2PO4–, in the removal of C.I. Acid Red 17 (AR17), as a model dye pollutant, was investigated in the presence of TiO2 nanoparticles immobilized on a glass plate and optimized using the Taguchi method. Sixteen experiments were required to study the effects of anions in different concentrations. It was found that the nature and concentration of inorganic anions significantly affected the removal rate of AR17 in the presence of immobilized TiO2. The results indicated that high concentrations of NO3– and HCO3– especially in combined mode can improve the AR17 removal rate in the presence of supported TiO2. For the first time, we reported 22 times increase in the AR17 removal rate in the presence of immobilized TiO2 with combined inorganic anions. Among the mentioned anions, NO3– ions had the most contribution in increasing the removal rate and H2PO4– ions had the highest role in decreasing it. Results indicated that this method can be a useful, promising, and cost-effective method for increasing removal rate of organic pollutants in the fixed-bed system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301521z
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15324–15330[article] Enhancement of Removal rate of an organic pollutant in the presence of immobilized TiO2 nanoparticles with inorganic anions combination : Optimization using taguchi approach [texte imprimé] / Mohammad A. Behnajady, Auteur ; Mahsa Hajiahmadi, Auteur ; Nasser Modirshahla, Auteur . - 2013 . - pp. 15324–15330.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15324–15330
Mots-clés : Organic pollutant Nanoparticles Optimization Résumé : In this paper, the effect of various inorganic anions, NO3–, HCO3–, SO42–, Cl–, and H2PO4–, in the removal of C.I. Acid Red 17 (AR17), as a model dye pollutant, was investigated in the presence of TiO2 nanoparticles immobilized on a glass plate and optimized using the Taguchi method. Sixteen experiments were required to study the effects of anions in different concentrations. It was found that the nature and concentration of inorganic anions significantly affected the removal rate of AR17 in the presence of immobilized TiO2. The results indicated that high concentrations of NO3– and HCO3– especially in combined mode can improve the AR17 removal rate in the presence of supported TiO2. For the first time, we reported 22 times increase in the AR17 removal rate in the presence of immobilized TiO2 with combined inorganic anions. Among the mentioned anions, NO3– ions had the most contribution in increasing the removal rate and H2PO4– ions had the highest role in decreasing it. Results indicated that this method can be a useful, promising, and cost-effective method for increasing removal rate of organic pollutants in the fixed-bed system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301521z Exemplaires
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Titre : Efficient one-pot synthesis of 5-(Ethoxymethyl)furfural from fructose catalyzed by a novel solid catalyst Type de document : texte imprimé Auteurs : Liu Bing, Auteur ; Zehui Zhang, Auteur ; Kejian Deng, Auteur Année de publication : 2013 Article en page(s) : pp. 15331–15336 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Résumé : A novel method has been developed for the direct conversion of fructose into 5-(ethoxymethyl)furfural (EMF) catalyzed by an organic–inorganic hybrid solid catalyst [MIMBS]3PW12O40. First, etherification of 5-(hydroxymethyl)furfural (HMF) by ethanol was studied over a series of catalysts, and [MIMBS]3PW12O40 showed the best catalytic activity with an EMF yield of 90.7% at 70 °C. Then the one-pot dehydrative etherification of fructose into EMF was studied. It indicated that a low temperature (70 °C) was not favored for the dehydrative etherification process, and a high temperature (110 °C) was favored to promote side reactions. A high EMF yield of 90.5% was obtained from fructose at 90 °C with 5 mol % catalyst for 24 h. The recycling test demonstrated that [MIMBS]3PW12O40 could be reused several times without losing catalytic activity, with an average EMF yield of approximate 90%. This work provides a meaningful method for the conversion of carbohydrates into fine chemicals and biofuel additives. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3020445
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15331–15336[article] Efficient one-pot synthesis of 5-(Ethoxymethyl)furfural from fructose catalyzed by a novel solid catalyst [texte imprimé] / Liu Bing, Auteur ; Zehui Zhang, Auteur ; Kejian Deng, Auteur . - 2013 . - pp. 15331–15336.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15331–15336
Mots-clés : Catalyst Résumé : A novel method has been developed for the direct conversion of fructose into 5-(ethoxymethyl)furfural (EMF) catalyzed by an organic–inorganic hybrid solid catalyst [MIMBS]3PW12O40. First, etherification of 5-(hydroxymethyl)furfural (HMF) by ethanol was studied over a series of catalysts, and [MIMBS]3PW12O40 showed the best catalytic activity with an EMF yield of 90.7% at 70 °C. Then the one-pot dehydrative etherification of fructose into EMF was studied. It indicated that a low temperature (70 °C) was not favored for the dehydrative etherification process, and a high temperature (110 °C) was favored to promote side reactions. A high EMF yield of 90.5% was obtained from fructose at 90 °C with 5 mol % catalyst for 24 h. The recycling test demonstrated that [MIMBS]3PW12O40 could be reused several times without losing catalytic activity, with an average EMF yield of approximate 90%. This work provides a meaningful method for the conversion of carbohydrates into fine chemicals and biofuel additives. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3020445 Exemplaires
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Titre : Modeling coke distribution above the freeboard of a FLUID COKING reactor Type de document : texte imprimé Auteurs : Christopher B. Solnordal, Auteur ; Kevin J. Reid, Auteur ; Larry P. Hackman, Auteur Année de publication : 2013 Article en page(s) : pp. 15337–15350 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid coking Résumé : In a FLUID COKING unit, reactor cyclone fouling by coke deposits can set the run length of the unit. Over time the coke deposits can grow and obstruct the cyclone which will limit throughput and lead to a shutdown. For this reason, producing a more uniform coke distribution pattern within the reactor horn chamber may lead to an increased interval between turnarounds. An existing pilot-scale experimental model of the coker reactor freeboard, horn chamber, and exit cyclones allows determination of coke distribution to the cyclones, but provides limited understanding of the underlying fluid dynamics within the system. In this work a two-phase computational fluid dynamics (CFD) model of this experimental rig was developed. Coke was modeled as an Eulerian stream of solid particles with monodisperse particle diameter. It was found that predicted coke distributions were sensitive to the choice of coke diameter, but a suitable choice gave good agreement with experimental observations. In the current work this value was 167 μm which was substantially higher than the value of the Sauter mean diameter of 139 μm. It was found that the CFD model could quantitatively predict coke distributions in the freeboard region of a FLUID COKING reactor experimental rig, while providing insight into the flow dynamics. When modeling the particle size distribution with a monodisperse particle diameter, comparison with experimental results is necessary to identify the coke particle diameter that leads to optimal model performance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3010176
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15337–15350[article] Modeling coke distribution above the freeboard of a FLUID COKING reactor [texte imprimé] / Christopher B. Solnordal, Auteur ; Kevin J. Reid, Auteur ; Larry P. Hackman, Auteur . - 2013 . - pp. 15337–15350.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15337–15350
Mots-clés : Fluid coking Résumé : In a FLUID COKING unit, reactor cyclone fouling by coke deposits can set the run length of the unit. Over time the coke deposits can grow and obstruct the cyclone which will limit throughput and lead to a shutdown. For this reason, producing a more uniform coke distribution pattern within the reactor horn chamber may lead to an increased interval between turnarounds. An existing pilot-scale experimental model of the coker reactor freeboard, horn chamber, and exit cyclones allows determination of coke distribution to the cyclones, but provides limited understanding of the underlying fluid dynamics within the system. In this work a two-phase computational fluid dynamics (CFD) model of this experimental rig was developed. Coke was modeled as an Eulerian stream of solid particles with monodisperse particle diameter. It was found that predicted coke distributions were sensitive to the choice of coke diameter, but a suitable choice gave good agreement with experimental observations. In the current work this value was 167 μm which was substantially higher than the value of the Sauter mean diameter of 139 μm. It was found that the CFD model could quantitatively predict coke distributions in the freeboard region of a FLUID COKING reactor experimental rig, while providing insight into the flow dynamics. When modeling the particle size distribution with a monodisperse particle diameter, comparison with experimental results is necessary to identify the coke particle diameter that leads to optimal model performance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3010176 Exemplaires
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Titre : Heterogeneous catalytic oxidation of aqueous phenol on red mud-supported cobalt catalysts Type de document : texte imprimé Auteurs : Syaifullah Muhammad, Auteur ; Edy Saputra, Auteur ; Hongqi Sun, Auteur Année de publication : 2013 Article en page(s) : pp. 15351-15359 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Oxidation Catalytic reaction Résumé : Red mud (RM), an industrial waste from the alumina refinery industry, was used as a support for preparation of Co-oxide-based catalysts (Co/RM). The samples were characterized by N2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and UV―vis diffusive reflectance spectroscopy. The heterogeneous catalytic activity was evaluated in aqueous phenol degradation using peroxymonosulphate (PMS) as an oxidizing agent. It was found that Co3O4 particles were highly dispersed on the RM surface and that pretreatment of the red mud (RM-T) would significantly influence catalytic activity. Co/RM-T catalysts exhibited high effectiveness in heterogeneous activation of PMS to produce sulfate radicals for phenol degradation compared with Co/RM-NT. Phenol degradation followed first-order kinetics, and activation energies on Co/RM-T and Co/RM-NT are 46.2 and 47.0 kJ/mol, respectively. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679656
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15351-15359[article] Heterogeneous catalytic oxidation of aqueous phenol on red mud-supported cobalt catalysts [texte imprimé] / Syaifullah Muhammad, Auteur ; Edy Saputra, Auteur ; Hongqi Sun, Auteur . - 2013 . - pp. 15351-15359.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15351-15359
Mots-clés : Catalyst Oxidation Catalytic reaction Résumé : Red mud (RM), an industrial waste from the alumina refinery industry, was used as a support for preparation of Co-oxide-based catalysts (Co/RM). The samples were characterized by N2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and UV―vis diffusive reflectance spectroscopy. The heterogeneous catalytic activity was evaluated in aqueous phenol degradation using peroxymonosulphate (PMS) as an oxidizing agent. It was found that Co3O4 particles were highly dispersed on the RM surface and that pretreatment of the red mud (RM-T) would significantly influence catalytic activity. Co/RM-T catalysts exhibited high effectiveness in heterogeneous activation of PMS to produce sulfate radicals for phenol degradation compared with Co/RM-NT. Phenol degradation followed first-order kinetics, and activation energies on Co/RM-T and Co/RM-NT are 46.2 and 47.0 kJ/mol, respectively. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679656 Exemplaires
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Titre : Adsorption and photocatalytic oxidation of methanol–benzene binary mixture in an annular fluidized bed photocatalytic reactor Type de document : texte imprimé Auteurs : Geng Qijin, Auteur ; Wang Qingming, Auteur ; Zhang Bin, Auteur Année de publication : 2013 Article en page(s) : pp. 15360–15373 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photocatalytic Oxidation Résumé : Adsorption and photocatalytic degradation kinetics of a gaseous benzene–methanol binary mixture in an annular fluidized bed photocatalytic reactor (AFBPR) were investigated. On the basis of a series of adsorption and photocatalytic degradation kinetic equations developed, the influences of molar ratios of benzene–methanol and relative humidity (RH) on adsorption efficiency, degradation efficiency, and half-life were explored. The results indicated that the molar ratio of benzene–methanol and RH has obviously influenced the adsorption/photocatalytic degradation and corresponding kinetic parameters. In the adsorption process, the coadsorption mechanism of methanol–benzene not only was related to competition adsorption but also involved penetrating the multi- or mono-water layer formed on the surface of catalyst particles as well. On the basis of the photocatalytic degradation kinetics of the benzene–methanol binary component, a new mechanism occurred in the photocatalytic oxidation of the methanol–benzene binary mixture due to competitive adsorption of them and some new radicals produced on the same photocatalyst surface was deduced. The special complex relationship between the photocatalytic degradation efficiency and the molar ratio of benzene–methanol with various RH demonstrated that there was an obvious synergy effect between benzene, methanol, and water molecule in photocatalytic degradation processes. This investigation highlights the importance of controlling RH and molar ratio in binary mixture in order to obtain the desired synergy effect in PCO processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302207p
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15360–15373[article] Adsorption and photocatalytic oxidation of methanol–benzene binary mixture in an annular fluidized bed photocatalytic reactor [texte imprimé] / Geng Qijin, Auteur ; Wang Qingming, Auteur ; Zhang Bin, Auteur . - 2013 . - pp. 15360–15373.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15360–15373
Mots-clés : Photocatalytic Oxidation Résumé : Adsorption and photocatalytic degradation kinetics of a gaseous benzene–methanol binary mixture in an annular fluidized bed photocatalytic reactor (AFBPR) were investigated. On the basis of a series of adsorption and photocatalytic degradation kinetic equations developed, the influences of molar ratios of benzene–methanol and relative humidity (RH) on adsorption efficiency, degradation efficiency, and half-life were explored. The results indicated that the molar ratio of benzene–methanol and RH has obviously influenced the adsorption/photocatalytic degradation and corresponding kinetic parameters. In the adsorption process, the coadsorption mechanism of methanol–benzene not only was related to competition adsorption but also involved penetrating the multi- or mono-water layer formed on the surface of catalyst particles as well. On the basis of the photocatalytic degradation kinetics of the benzene–methanol binary component, a new mechanism occurred in the photocatalytic oxidation of the methanol–benzene binary mixture due to competitive adsorption of them and some new radicals produced on the same photocatalyst surface was deduced. The special complex relationship between the photocatalytic degradation efficiency and the molar ratio of benzene–methanol with various RH demonstrated that there was an obvious synergy effect between benzene, methanol, and water molecule in photocatalytic degradation processes. This investigation highlights the importance of controlling RH and molar ratio in binary mixture in order to obtain the desired synergy effect in PCO processes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302207p Exemplaires
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Titre : Low molecular weight organogels and their application in the synthesis of CdS nanoparticles Type de document : texte imprimé Auteurs : Pradipta Kumar, Auteur ; Mahesh M. Kadam, Auteur ; Vilas G. Gaikar, Auteur Année de publication : 2013 Article en page(s) : pp. 15374-15385 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanoparticle Résumé : Two new fatty acid based derivatives containing carboxylate and amide functions with different alkyl chain lengths were synthesized, and their properties as low molecular weight (LMW) gelators for organic solvents such as nitrobenzene, chlorobenzene, dichlorobenzene, and dioxane are evaluated. The xerogels under Scanning Electron Microscope (SEM) show self-assembled fibrillar and flowerlike structures. Rheological properties of the gelator forming an extended fibrillar network were studied to verify the solidlike behavior of the gel. The role of intermolecular hydrogen bonding in the formation of the supramolecular structures was confirmed through FTIR spectroscopy. The nitrobenzene based organogel superstructure was used as a template for synthesis of CdS nanoparticles. The nanoparticles were characterized through UV-vis spectroscopy and Transmission Electron Microscopy (TEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679658
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15374-15385[article] Low molecular weight organogels and their application in the synthesis of CdS nanoparticles [texte imprimé] / Pradipta Kumar, Auteur ; Mahesh M. Kadam, Auteur ; Vilas G. Gaikar, Auteur . - 2013 . - pp. 15374-15385.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15374-15385
Mots-clés : Nanoparticle Résumé : Two new fatty acid based derivatives containing carboxylate and amide functions with different alkyl chain lengths were synthesized, and their properties as low molecular weight (LMW) gelators for organic solvents such as nitrobenzene, chlorobenzene, dichlorobenzene, and dioxane are evaluated. The xerogels under Scanning Electron Microscope (SEM) show self-assembled fibrillar and flowerlike structures. Rheological properties of the gelator forming an extended fibrillar network were studied to verify the solidlike behavior of the gel. The role of intermolecular hydrogen bonding in the formation of the supramolecular structures was confirmed through FTIR spectroscopy. The nitrobenzene based organogel superstructure was used as a template for synthesis of CdS nanoparticles. The nanoparticles were characterized through UV-vis spectroscopy and Transmission Electron Microscopy (TEM). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679658 Exemplaires
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Titre : Preparation of high pore volume pseudoboehmite doped with transition metal ions through direct precipitation method Type de document : texte imprimé Auteurs : Fan Yang, Auteur ; Qiang Wang, Auteur ; Jinglong Yan, Auteur Année de publication : 2013 Article en page(s) : pp. 15386–15392 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Metal ion Preparation Résumé : Mesoporous pseudoboehmite with novel pore properties was prepared via the direct precipitation method using aluminum nitrate nonahydrate as the inorganic alumina precursor and different surfactants containing bis (2-ethylhexyl) sulfosuccinate sodium salt (AOT), cetyltrimethylammonium bromide (CTAB), and tert-octylphenoxypolyethoxyethanol (Triton X-100) as the structure-directing agents. The as-synthesized mesoporous products were characterized by wide-angle X-ray diffraction (XRD) and transmission electron microscope (TEM) imaging. Pure pseudoboehmite could be obtained when the final pH was between 8 and 10.5, and the presence of different surfactant micelles played an important role in the morphology and growth of pseudoboehmite. In addition, the pore properties could be enhanced significantly by the presence of transition metal ions. Particularly, when nickel nitrate was added to the aluminum nitrate solution at the molar ratio of 0.0040, the specific surface area, the pore volume, and the average pore diameter of pseudoboehmite reached significantly large values of 381 m2/g, 1.18 cm3/g, and 9 nm, respectively. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679659
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15386–15392[article] Preparation of high pore volume pseudoboehmite doped with transition metal ions through direct precipitation method [texte imprimé] / Fan Yang, Auteur ; Qiang Wang, Auteur ; Jinglong Yan, Auteur . - 2013 . - pp. 15386–15392.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15386–15392
Mots-clés : Metal ion Preparation Résumé : Mesoporous pseudoboehmite with novel pore properties was prepared via the direct precipitation method using aluminum nitrate nonahydrate as the inorganic alumina precursor and different surfactants containing bis (2-ethylhexyl) sulfosuccinate sodium salt (AOT), cetyltrimethylammonium bromide (CTAB), and tert-octylphenoxypolyethoxyethanol (Triton X-100) as the structure-directing agents. The as-synthesized mesoporous products were characterized by wide-angle X-ray diffraction (XRD) and transmission electron microscope (TEM) imaging. Pure pseudoboehmite could be obtained when the final pH was between 8 and 10.5, and the presence of different surfactant micelles played an important role in the morphology and growth of pseudoboehmite. In addition, the pore properties could be enhanced significantly by the presence of transition metal ions. Particularly, when nickel nitrate was added to the aluminum nitrate solution at the molar ratio of 0.0040, the specific surface area, the pore volume, and the average pore diameter of pseudoboehmite reached significantly large values of 381 m2/g, 1.18 cm3/g, and 9 nm, respectively. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679659 Exemplaires
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Titre : A plant-wide dynamic model of a continuous pharmaceutical process Type de document : texte imprimé Auteurs : Brahim Benyahia, Auteur ; Richard Lakerveld, Auteur ; Paul I. Barton, Auteur Année de publication : 2013 Article en page(s) : pp 15393–15412 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Pharmaceutical industry Résumé : The pharmaceutical industry has historically benefited from high profit margins for their products, and over the years limited efforts have been made to change the main manufacturing concept from batch into continuous. However, over the past decade, as a result of an increased demand for more efficient and cost-effective processes, interest has grown in the application of continuous manufacturing to address economical and technical issues in the pharmaceutical field. This option is becoming more viable, particularly with the implementation of new process analytical technology (PAT). In this paper, we present a plant-wide mathematical model inspired by a recently developed continuous pharmaceutical pilot plant. This model is first used to simulate a base case that shows typical limitations in achieving simultaneously high productivity and quality. The main critical quality attribute considered is the purity of the final product. To alleviate the base case limitations and improve the pilot plant performance, the effects of several design parameters are investigated and the most critical are identified. In addition, alternative start-up scenarios are considered to improve the transient performance of the pilot plant, particularly time to steady state. The environmental footprint of the pilot plant is evaluated and shown to be low. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3006319
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp 15393–15412[article] A plant-wide dynamic model of a continuous pharmaceutical process [texte imprimé] / Brahim Benyahia, Auteur ; Richard Lakerveld, Auteur ; Paul I. Barton, Auteur . - 2013 . - pp 15393–15412.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp 15393–15412
Mots-clés : Pharmaceutical industry Résumé : The pharmaceutical industry has historically benefited from high profit margins for their products, and over the years limited efforts have been made to change the main manufacturing concept from batch into continuous. However, over the past decade, as a result of an increased demand for more efficient and cost-effective processes, interest has grown in the application of continuous manufacturing to address economical and technical issues in the pharmaceutical field. This option is becoming more viable, particularly with the implementation of new process analytical technology (PAT). In this paper, we present a plant-wide mathematical model inspired by a recently developed continuous pharmaceutical pilot plant. This model is first used to simulate a base case that shows typical limitations in achieving simultaneously high productivity and quality. The main critical quality attribute considered is the purity of the final product. To alleviate the base case limitations and improve the pilot plant performance, the effects of several design parameters are investigated and the most critical are identified. In addition, alternative start-up scenarios are considered to improve the transient performance of the pilot plant, particularly time to steady state. The environmental footprint of the pilot plant is evaluated and shown to be low. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3006319 Exemplaires
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Titre : Improving energy efficiency and cost-effectiveness of batch distillation for separating wide boiling constituents. 1. : Vapor Recompression Column Type de document : texte imprimé Auteurs : Md. Malik Nawaz Khan, Auteur ; G. Uday Bhaskar Babu, Auteur ; Amiya K. Jana, Auteur Année de publication : 2013 Article en page(s) : pp. 15413–15422 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Boiling Distillation Batchwise Energetic efficiency Résumé : Although the direct vapor recompression column (VRC) has been known for its application in continuous distillation since the 1960s, the research on vapor recompressed batch distillation (VRBD) started a couple of years ago. In this contribution, a batch splitter assisted by a heat pump of the vapor recompression type is investigated by rigorous method. When the VRC system is employed in batch processing, a variable manipulation procedure has to be adopted, leading to the adjustment of either the vapor inflow rate to the compressor by splitting the overhead vapor or the external heat input to the reboiler. The present work aims at exploring the operational and economical feasibility of the VRBD column for the fractionation of a mixture consisting of wide boiling components. By separating this binary mixture, it is quantitatively shown how closely the reversible batch operation can be approximated by using the direct compression of overhead vapor. To further strengthen the advantages of the VRC scheme over its conventional counterpart, a variable speed VRBD structure is proposed by introducing a variable speed compressor in the VRBD configuration aiming to run the column at a controlled compression ratio. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679661
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15413–15422[article] Improving energy efficiency and cost-effectiveness of batch distillation for separating wide boiling constituents. 1. : Vapor Recompression Column [texte imprimé] / Md. Malik Nawaz Khan, Auteur ; G. Uday Bhaskar Babu, Auteur ; Amiya K. Jana, Auteur . - 2013 . - pp. 15413–15422.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15413–15422
Mots-clés : Boiling Distillation Batchwise Energetic efficiency Résumé : Although the direct vapor recompression column (VRC) has been known for its application in continuous distillation since the 1960s, the research on vapor recompressed batch distillation (VRBD) started a couple of years ago. In this contribution, a batch splitter assisted by a heat pump of the vapor recompression type is investigated by rigorous method. When the VRC system is employed in batch processing, a variable manipulation procedure has to be adopted, leading to the adjustment of either the vapor inflow rate to the compressor by splitting the overhead vapor or the external heat input to the reboiler. The present work aims at exploring the operational and economical feasibility of the VRBD column for the fractionation of a mixture consisting of wide boiling components. By separating this binary mixture, it is quantitatively shown how closely the reversible batch operation can be approximated by using the direct compression of overhead vapor. To further strengthen the advantages of the VRC scheme over its conventional counterpart, a variable speed VRBD structure is proposed by introducing a variable speed compressor in the VRBD configuration aiming to run the column at a controlled compression ratio. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679661 Exemplaires
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Titre : Two-stage start-up to achieve the stable via-nitrite pathway in a demonstration SBR for anaerobic codigestate treatment Type de document : texte imprimé Auteurs : Nicola Frison, Auteur ; Silvia Lampis, Auteur ; David Bolzonella, Auteur Année de publication : 2013 Article en page(s) : pp. 15423-15430 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Anaerobe Résumé : The supernatant effluent from full scale anaerobic codigestion of waste-activated sludge and the organic fraction of municipal solid waste was treated by a demonstration sequencing batch reactor for short-cut nitrogen removal. After inoculation with conventional municipal activated sludge, the strategy of two-stage start-up allowed us the fast speciation of ammonia oxidizing bacteria (achieved within 20 days), then the achievement of the maximal treatment potential (0.8 kgN m―3 d―1) for nitritation-denitritation. By automatic indirect control of the free ammonia and the free nitrous acid concentrations, the via-nitrite pathway was fully and stably achieved under aerobic conditions (DO of 1.5 mg L―1) and T of 15 °C. Under ordinary operation, the specific nitritation rates were 15―20 mgN gMLVSS―1h―1, while the denitritation rate was 45―50 mgN gMLVSS―1h―1. In-situ and ex-situ respirometry and gene-based molecular techniques demonstrated the stable presence of a dominant, restricted ammonia oxidizing bacterial population after the first-stage aerobic start-up. We therefore demonstrated that codigestion and advanced nitrogen removal from anaerobic supernatant may optimize the performances of an integrated municipal treatment plant. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679662
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15423-15430[article] Two-stage start-up to achieve the stable via-nitrite pathway in a demonstration SBR for anaerobic codigestate treatment [texte imprimé] / Nicola Frison, Auteur ; Silvia Lampis, Auteur ; David Bolzonella, Auteur . - 2013 . - pp. 15423-15430.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15423-15430
Mots-clés : Anaerobe Résumé : The supernatant effluent from full scale anaerobic codigestion of waste-activated sludge and the organic fraction of municipal solid waste was treated by a demonstration sequencing batch reactor for short-cut nitrogen removal. After inoculation with conventional municipal activated sludge, the strategy of two-stage start-up allowed us the fast speciation of ammonia oxidizing bacteria (achieved within 20 days), then the achievement of the maximal treatment potential (0.8 kgN m―3 d―1) for nitritation-denitritation. By automatic indirect control of the free ammonia and the free nitrous acid concentrations, the via-nitrite pathway was fully and stably achieved under aerobic conditions (DO of 1.5 mg L―1) and T of 15 °C. Under ordinary operation, the specific nitritation rates were 15―20 mgN gMLVSS―1h―1, while the denitritation rate was 45―50 mgN gMLVSS―1h―1. In-situ and ex-situ respirometry and gene-based molecular techniques demonstrated the stable presence of a dominant, restricted ammonia oxidizing bacterial population after the first-stage aerobic start-up. We therefore demonstrated that codigestion and advanced nitrogen removal from anaerobic supernatant may optimize the performances of an integrated municipal treatment plant. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679662 Exemplaires
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Titre : Process configurations and simulations for a novel single-column cryogenic air separation process Type de document : texte imprimé Auteurs : Hua Zhou, Auteur ; Yunan Cai, Auteur ; Yao Xiao, Auteur Année de publication : 2013 Article en page(s) : pp. 15431-15439 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Separation process Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439[article] Process configurations and simulations for a novel single-column cryogenic air separation process [texte imprimé] / Hua Zhou, Auteur ; Yunan Cai, Auteur ; Yao Xiao, Auteur . - 2013 . - pp. 15431-15439.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439
Mots-clés : Separation process Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663 Exemplaires
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Titre : Numerical Simulation of the Flue Gas and Process Side of Coking Furnaces Type de document : texte imprimé Auteurs : Junwei Yang, Auteur ; Ningning Tai, Auteur ; Lanjuan Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 15431-15439 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Separation process Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439[article] Numerical Simulation of the Flue Gas and Process Side of Coking Furnaces [texte imprimé] / Junwei Yang, Auteur ; Ningning Tai, Auteur ; Lanjuan Wang, Auteur . - 2013 . - pp. 15431-15439.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439
Mots-clés : Separation process Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663 Exemplaires
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Titre : Incorporating pinch distillation boundaries into the conceptual modeling of batch distillations : Ternary mixtures Type de document : texte imprimé Auteurs : Karina Andrea Torres, Auteur ; Jose Espinosa, Auteur Année de publication : 2013 Article en page(s) : pp. 15448-15455 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ternary mixture Batchwise Modeling Distillation Résumé : This contribution explores the influence of curved unstable distillation boundaries on the performance of batch distillations in ternary mixtures and its incorporation into a conceptual modeling framework under the assumption of a batch rectifier with an infinite number of stages. First, the concept of preferred separation in batch distillation is presented. Calculation of "pitchfork" distillation boundaries is then determined using a robust predictor-corrector algorithm based on improved memory method with the purpose of estimating the maximum feasible distillate composition in the preferred separation line. Four highly nonideal systems are studied. Finally, the model is extended to allow simulation of the operation at different reflux policies. Results of a complete simulation performed with the enhanced conceptual model are shown for the system octane/2-ethoxyethanol/ ethylbenzene. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679665
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15448-15455[article] Incorporating pinch distillation boundaries into the conceptual modeling of batch distillations : Ternary mixtures [texte imprimé] / Karina Andrea Torres, Auteur ; Jose Espinosa, Auteur . - 2013 . - pp. 15448-15455.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15448-15455
Mots-clés : Ternary mixture Batchwise Modeling Distillation Résumé : This contribution explores the influence of curved unstable distillation boundaries on the performance of batch distillations in ternary mixtures and its incorporation into a conceptual modeling framework under the assumption of a batch rectifier with an infinite number of stages. First, the concept of preferred separation in batch distillation is presented. Calculation of "pitchfork" distillation boundaries is then determined using a robust predictor-corrector algorithm based on improved memory method with the purpose of estimating the maximum feasible distillate composition in the preferred separation line. Four highly nonideal systems are studied. Finally, the model is extended to allow simulation of the operation at different reflux policies. Results of a complete simulation performed with the enhanced conceptual model are shown for the system octane/2-ethoxyethanol/ ethylbenzene. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679665 Exemplaires
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Titre : A Combined coagulation/flocculation and membrane filtration process for the treatment of paint industry wastewaters Type de document : texte imprimé Auteurs : Dimitris P. Zagklis, Auteur ; Petros G. Koutsoukos, Auteur ; Christakis A. Paraskeva, Auteur Année de publication : 2013 Article en page(s) : pp. 15456-15462 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane separation Industrial waste water Paint filtration Flocculation Coagulation Résumé : Coagulation/flocculation process is considered as a nonexpensive and effective method to reduce organic and inorganic content of industrial wastewaters. In the present study series of polyelectrolytes were tested to optimize the existing procedure with new chemical reagents that resulted in removal percentages up to 93%. Organic load expressed in terms of chemical oxygen demand, particle size distribution, pH, and ζ potential of suspended particles were among the parameters that were investigated for the best coagulation/flocculation of particles suspended in paint industrial wastewaters. The target was to find the optimum concentration values of polyelectrolytes that neutralize the ζ potential and shrink the particle size distribution. The remaining organic compounds were further treated with a combined ultrafiltration/reverse osmosis system that almost eliminated the organic content, and the final permeate stream is suitable for reuse in the premises of the industry. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679666
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15456-15462[article] A Combined coagulation/flocculation and membrane filtration process for the treatment of paint industry wastewaters [texte imprimé] / Dimitris P. Zagklis, Auteur ; Petros G. Koutsoukos, Auteur ; Christakis A. Paraskeva, Auteur . - 2013 . - pp. 15456-15462.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15456-15462
Mots-clés : Membrane separation Industrial waste water Paint filtration Flocculation Coagulation Résumé : Coagulation/flocculation process is considered as a nonexpensive and effective method to reduce organic and inorganic content of industrial wastewaters. In the present study series of polyelectrolytes were tested to optimize the existing procedure with new chemical reagents that resulted in removal percentages up to 93%. Organic load expressed in terms of chemical oxygen demand, particle size distribution, pH, and ζ potential of suspended particles were among the parameters that were investigated for the best coagulation/flocculation of particles suspended in paint industrial wastewaters. The target was to find the optimum concentration values of polyelectrolytes that neutralize the ζ potential and shrink the particle size distribution. The remaining organic compounds were further treated with a combined ultrafiltration/reverse osmosis system that almost eliminated the organic content, and the final permeate stream is suitable for reuse in the premises of the industry. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679666 Exemplaires
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Titre : Surface-dissociated nanoparticle draw solutions in forward osmosis and the regeneration in an integrated electric field and nanofiltration system Type de document : texte imprimé Auteurs : Ming Ming Ling, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2013 Article en page(s) : pp. 15463-15471 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane separation Nanofiltration Electric field Osmosis Nanoparticle Résumé : Draw solutions of surface-dissociated nanoparticles in forward osmosis (FO) processes and their regeneration through an integrated electric field-nanofiltration system for water reclamation were explored for the first time. Nanoparticles of 20 nm in diameter were functionalized with different surface chemistries to systematically investigate the effects on the FO performance. Experimental results showed that the draw solutions of surface-dissociated nanoparticle prepared with alkalis exhibited higher osmotic driving forces. Compared to salt base draw solutes, the advantage of surface-dissociated nanoparticle draw solutes exhibits no reverse flux across the FO membrane. The diluted draw solution of surface-dissociated nanoparticles can be readily recovered via an integrated electric field and nanofiltration system with sustainable regeneration efficiency. Our preliminary results suggest the potential of surface-dissociated nanoparticles as draw solutes in FO for water reuse. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679667
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15463-15471[article] Surface-dissociated nanoparticle draw solutions in forward osmosis and the regeneration in an integrated electric field and nanofiltration system [texte imprimé] / Ming Ming Ling, Auteur ; Tai-Shung Chung, Auteur . - 2013 . - pp. 15463-15471.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15463-15471
Mots-clés : Membrane separation Nanofiltration Electric field Osmosis Nanoparticle Résumé : Draw solutions of surface-dissociated nanoparticles in forward osmosis (FO) processes and their regeneration through an integrated electric field-nanofiltration system for water reclamation were explored for the first time. Nanoparticles of 20 nm in diameter were functionalized with different surface chemistries to systematically investigate the effects on the FO performance. Experimental results showed that the draw solutions of surface-dissociated nanoparticle prepared with alkalis exhibited higher osmotic driving forces. Compared to salt base draw solutes, the advantage of surface-dissociated nanoparticle draw solutes exhibits no reverse flux across the FO membrane. The diluted draw solution of surface-dissociated nanoparticles can be readily recovered via an integrated electric field and nanofiltration system with sustainable regeneration efficiency. Our preliminary results suggest the potential of surface-dissociated nanoparticles as draw solutes in FO for water reuse. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679667 Exemplaires
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Titre : A Model for direct estimation of wetting phase relative permeabilities using a multistep drainage process Type de document : texte imprimé Auteurs : Shengdong Wang, Auteur ; Mingzhe Dong, Auteur ; Jun Yao, Auteur Année de publication : 2013 Article en page(s) : pp. 15472-15483 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Permeability Wetting Modeling Résumé : A new analytical model has been developed for determining the wetting phase relative permeabilities in a multiple gas―liquid drainage process. The multistep drainage process consists of a series of drainage processes with a tiered pressure-difference profile. With this model, the wetting phase relative permeabilities can be readily obtained through regression of the wetting phase recovery history. The assumptions used in deriving the analytical model are examined by numerical simulations. The agreement between the analytical and the numerical results indicates that these assumptions are reasonable and valid. Numerical simulations and laboratory results demonstrate that this model is effective for direct estimation of the wetting phase relative permeabilities in the multistep drainage process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679668
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15472-15483[article] A Model for direct estimation of wetting phase relative permeabilities using a multistep drainage process [texte imprimé] / Shengdong Wang, Auteur ; Mingzhe Dong, Auteur ; Jun Yao, Auteur . - 2013 . - pp. 15472-15483.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15472-15483
Mots-clés : Permeability Wetting Modeling Résumé : A new analytical model has been developed for determining the wetting phase relative permeabilities in a multiple gas―liquid drainage process. The multistep drainage process consists of a series of drainage processes with a tiered pressure-difference profile. With this model, the wetting phase relative permeabilities can be readily obtained through regression of the wetting phase recovery history. The assumptions used in deriving the analytical model are examined by numerical simulations. The agreement between the analytical and the numerical results indicates that these assumptions are reasonable and valid. Numerical simulations and laboratory results demonstrate that this model is effective for direct estimation of the wetting phase relative permeabilities in the multistep drainage process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679668 Exemplaires
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Titre : Fast compartmental monte carlo simulation of population balance models : Application to Nanoparticle formation in nonhomogeneous conditions Type de document : texte imprimé Auteurs : Roberto Irizarry, Auteur Année de publication : 2013 Article en page(s) : pp. 15484–15496 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanoparticle Résumé : A new compartmental Monte Carlo (CMC) algorithm is introduced for the stochastic simulation of population balance models in spatially heterogeneous systems. The heterogeneities are modeled using a network of compartments. The algorithm is based on a new stochastic procedure called particle bundle flow (PBF) to model the stochastic transfer of particles between compartments in a given time interval (a time-driven algorithm). Different from other time-driven methods, the accuracy of the PBF is independent of the particle concentration. The validity of the PBF method is demonstrated by construction and confirmed with numerical experiments. A new strategy for time step control is developed to set bounds on the calculation of the time steps during the simulation. The CMC algorithm, based on the combination of the PBF algorithm with the τ point ensemble Monte Carlo algorithm, is a general-purpose methodology that can be applied to any network of compartments. The computational speed and the low computational load of this algorithm allow the solution of problems that may be intractable otherwise. A new hybrid strategy for the solution of problems with stochastic fluctuations and disparate time scales is also developed in this work. The CMC is applied to study the formation of nanoparticles in a large reactor utilizing a two-compartment model. The Monte Carlo ability to track single events is utilized to study the impact of turbulence and the stability factor on the generation of large particles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3011116
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15484–15496[article] Fast compartmental monte carlo simulation of population balance models : Application to Nanoparticle formation in nonhomogeneous conditions [texte imprimé] / Roberto Irizarry, Auteur . - 2013 . - pp. 15484–15496.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15484–15496
Mots-clés : Nanoparticle Résumé : A new compartmental Monte Carlo (CMC) algorithm is introduced for the stochastic simulation of population balance models in spatially heterogeneous systems. The heterogeneities are modeled using a network of compartments. The algorithm is based on a new stochastic procedure called particle bundle flow (PBF) to model the stochastic transfer of particles between compartments in a given time interval (a time-driven algorithm). Different from other time-driven methods, the accuracy of the PBF is independent of the particle concentration. The validity of the PBF method is demonstrated by construction and confirmed with numerical experiments. A new strategy for time step control is developed to set bounds on the calculation of the time steps during the simulation. The CMC algorithm, based on the combination of the PBF algorithm with the τ point ensemble Monte Carlo algorithm, is a general-purpose methodology that can be applied to any network of compartments. The computational speed and the low computational load of this algorithm allow the solution of problems that may be intractable otherwise. A new hybrid strategy for the solution of problems with stochastic fluctuations and disparate time scales is also developed in this work. The CMC is applied to study the formation of nanoparticles in a large reactor utilizing a two-compartment model. The Monte Carlo ability to track single events is utilized to study the impact of turbulence and the stability factor on the generation of large particles. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3011116 Exemplaires
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Titre : Local composition for a binary mixture of particles on a three-dimensional ising lattice Type de document : texte imprimé Auteurs : Jean-Pierre Simonin, Auteur ; Virginie Marry, Auteur Année de publication : 2013 Article en page(s) : pp. 15497-15502 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Binary mixture Résumé : Results from Monte Carlo (MC) simulations are reported for a binary mixture of particles A and B placed at the nodes of a three-dimensional cubic Ising lattice, with pairwise nearest neighbor interactions between species i and j, Eij. The local composition is studied as a function of composition and of the value of the interchange energy (δ = 2EAB ― EAA ― EBB). The MC results are used to assess the accuracy of analytical theories proposed in the literature as a function of the interchange energy. The local composition is shown to obey an exact limiting law at high dilution of one component, thus providing a simple expression for the limiting activity coefficient. The activity coefficients of the species and the entropy per particle are computed from the MC data. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679670
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15497-15502[article] Local composition for a binary mixture of particles on a three-dimensional ising lattice [texte imprimé] / Jean-Pierre Simonin, Auteur ; Virginie Marry, Auteur . - 2013 . - pp. 15497-15502.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15497-15502
Mots-clés : Binary mixture Résumé : Results from Monte Carlo (MC) simulations are reported for a binary mixture of particles A and B placed at the nodes of a three-dimensional cubic Ising lattice, with pairwise nearest neighbor interactions between species i and j, Eij. The local composition is studied as a function of composition and of the value of the interchange energy (δ = 2EAB ― EAA ― EBB). The MC results are used to assess the accuracy of analytical theories proposed in the literature as a function of the interchange energy. The local composition is shown to obey an exact limiting law at high dilution of one component, thus providing a simple expression for the limiting activity coefficient. The activity coefficients of the species and the entropy per particle are computed from the MC data. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679670 Exemplaires
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Titre : Efficient conversion of cellulose to glucose, levulinic acid, and other products in hot water using SO2 as a recoverable catalyst Type de document : texte imprimé Auteurs : Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur Année de publication : 2013 Article en page(s) : pp. 15503-15508 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Hot water Résumé : Cellulose is the most widely distributed source of biomass, and its efficient conversion to a variety of chemicals is important for a sustainable future. In this work, sulfur dioxide (SO2) dissolved in hot water has been demonstrated to be an efficient catalyst for the selective conversion of cellulose to chemicals such as glucose and levulinic acid. The selectivity of products can be tuned by the SO2 concentration, temperature, and reaction time. SO2 acts both as a supply of H+ ions through ionization of H2SO3 when dissolved in water and as a Lewis acid catalyst that breaks the hydrogen bonds in cellulose. Importantly, SO2 in the reaction mixture can be recovered completely by stream stripping, thus avoiding the formation of acidic wastewater. This work provides a new, efficient, and environmentally benign way to convert cellulose to chemicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679671
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15503-15508[article] Efficient conversion of cellulose to glucose, levulinic acid, and other products in hot water using SO2 as a recoverable catalyst [texte imprimé] / Weina Liu, Auteur ; Yucui Hou, Auteur ; Weize Wu, Auteur . - 2013 . - pp. 15503-15508.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15503-15508
Mots-clés : Catalyst Hot water Résumé : Cellulose is the most widely distributed source of biomass, and its efficient conversion to a variety of chemicals is important for a sustainable future. In this work, sulfur dioxide (SO2) dissolved in hot water has been demonstrated to be an efficient catalyst for the selective conversion of cellulose to chemicals such as glucose and levulinic acid. The selectivity of products can be tuned by the SO2 concentration, temperature, and reaction time. SO2 acts both as a supply of H+ ions through ionization of H2SO3 when dissolved in water and as a Lewis acid catalyst that breaks the hydrogen bonds in cellulose. Importantly, SO2 in the reaction mixture can be recovered completely by stream stripping, thus avoiding the formation of acidic wastewater. This work provides a new, efficient, and environmentally benign way to convert cellulose to chemicals. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679671 Exemplaires
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Titre : Polysulfone/Vanillin Microcapsules Production Based on Vapor-Induced Phase Inversion Precipitation Type de document : texte imprimé Auteurs : Cinta Panisello, Auteur ; Ricard Garcia-Valls, Auteur Année de publication : 2013 Article en page(s) : pp. 15509–15516 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microcapsules Résumé : Polysulfone microcapsules containing vanillin were previously prepared by using a method based on phase inversion by immersion precipitation. Liquid water was used as the nonsolvent. Characteristics of that product were promising but further research was required. This work aims to prepare similar capsules by using vapor water as nonsolvent (vapor-induced phase inversion precipitation). The precipitation technique effect on capsules morphology and performance was studied. The products were morphologically characterized and significant differences were found only in the cross-section structure: if liquid water was used, macrovoids appeared in the wall; whereas by using water vapor, sponge-like structures were obtained. Finally, vanillin release was characterized, and release trends were the same for both preparations. Thus, the proposed process allowed the obtainment of capsules with similar performance. In addition, the use of water vapor showed a reduction of water consumption during the preparation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302051a
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15509–15516[article] Polysulfone/Vanillin Microcapsules Production Based on Vapor-Induced Phase Inversion Precipitation [texte imprimé] / Cinta Panisello, Auteur ; Ricard Garcia-Valls, Auteur . - 2013 . - pp. 15509–15516.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15509–15516
Mots-clés : Microcapsules Résumé : Polysulfone microcapsules containing vanillin were previously prepared by using a method based on phase inversion by immersion precipitation. Liquid water was used as the nonsolvent. Characteristics of that product were promising but further research was required. This work aims to prepare similar capsules by using vapor water as nonsolvent (vapor-induced phase inversion precipitation). The precipitation technique effect on capsules morphology and performance was studied. The products were morphologically characterized and significant differences were found only in the cross-section structure: if liquid water was used, macrovoids appeared in the wall; whereas by using water vapor, sponge-like structures were obtained. Finally, vanillin release was characterized, and release trends were the same for both preparations. Thus, the proposed process allowed the obtainment of capsules with similar performance. In addition, the use of water vapor showed a reduction of water consumption during the preparation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302051a Exemplaires
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Titre : Building blocks for ionic liquids : Vapor pressures and vaporization enthalpies of alkoxy derivatives of imidazole and benzimidazole Type de document : texte imprimé Auteurs : Inna V. Garist, Auteur ; Sergey P. Verevkin, Auteur ; Artemiy A. Samarov, Auteur Année de publication : 2013 Article en page(s) : pp. 15517-15524 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermodynamic properties Enthalpy Vaporization Vapor pressureIonic liquid Buildings Résumé : The design of physical solvents for applications such as CO2 capture has been an important research area as great emphasis is being placed on reducing greenhouse gas emissions. In gas treating with physical solvents, one of the most important solvent properties needed for efficient process operation is a low vapor pressure (≪100 Pa) at ambient temperature. We have identified alkoxy-functionalized imidazoles and benzimidazoles as candidates that can meet this criterion. Vapor pressures of alkoxy derivates of imidazole and benzimidazole have been determined as a function of temperature by the transpiration method. From these data, the molar enthalpies of vaporization (ΔgiHm) were calculated. The measured data sets were successfully checked for internal consistency by comparison with vaporization enthalpies of the parent species-dimethyl ethers of ethylene glycol, diethylene glycol, and triethylene glycol. We observe that for species with the same number of atoms in the side chain [e.g., 1-butylimidazole and 1-(2-methoxyethyl)-imidazole], replacing every third methylene group with an ether oxygen reduces vapor pressure by 50-75%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679673
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15517-15524[article] Building blocks for ionic liquids : Vapor pressures and vaporization enthalpies of alkoxy derivatives of imidazole and benzimidazole [texte imprimé] / Inna V. Garist, Auteur ; Sergey P. Verevkin, Auteur ; Artemiy A. Samarov, Auteur . - 2013 . - pp. 15517-15524.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15517-15524
Mots-clés : Thermodynamic properties Enthalpy Vaporization Vapor pressureIonic liquid Buildings Résumé : The design of physical solvents for applications such as CO2 capture has been an important research area as great emphasis is being placed on reducing greenhouse gas emissions. In gas treating with physical solvents, one of the most important solvent properties needed for efficient process operation is a low vapor pressure (≪100 Pa) at ambient temperature. We have identified alkoxy-functionalized imidazoles and benzimidazoles as candidates that can meet this criterion. Vapor pressures of alkoxy derivates of imidazole and benzimidazole have been determined as a function of temperature by the transpiration method. From these data, the molar enthalpies of vaporization (ΔgiHm) were calculated. The measured data sets were successfully checked for internal consistency by comparison with vaporization enthalpies of the parent species-dimethyl ethers of ethylene glycol, diethylene glycol, and triethylene glycol. We observe that for species with the same number of atoms in the side chain [e.g., 1-butylimidazole and 1-(2-methoxyethyl)-imidazole], replacing every third methylene group with an ether oxygen reduces vapor pressure by 50-75%. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679673 Exemplaires
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Titre : Synthesis, characterization, and sorption behavior of a novel composite cation exchange adsorbent Type de document : texte imprimé Auteurs : Mohammad Shahadat, Auteur ; A. H. Shalla, Auteur ; A. S. Raeissi, Auteur Année de publication : 2013 Article en page(s) : pp 15525–15529 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Sorption Adsorbent Résumé : A novel composite ion exchange adsorbent has been synthesized and characterized by using sophisticated techniques. The physicochemical parameters were also established to determine preliminary ion uptake properties of the exchanger. The material synthesized at pH 0.7, demonstrates promising ion exchange capacity (1.56 meq g–1 for Ba2+) together with chemical and thermal stability. It retains 76.4% ion exchange capacity up to 500 °C and shows higher uptake capacity than stannic selenite, stannic tungestoaresenate, and stannic molybdoaresenate. X-ray and SEM analyses show the amorphous nature of the material. On the basis of chemical composition and FTIR analysis a tentative formula has been assigned as (SnO2)(HMoO4)2(CH2CHCONH2) nH2O. The distribution coefficients behavior of material toward diverse metal ions was studied by varying the concentration of acid solvents. The practical usefulness of the material has been demonstrated by separating Cd2+ ions quantitatively from a synthetic mixture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014555
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp 15525–15529[article] Synthesis, characterization, and sorption behavior of a novel composite cation exchange adsorbent [texte imprimé] / Mohammad Shahadat, Auteur ; A. H. Shalla, Auteur ; A. S. Raeissi, Auteur . - 2013 . - pp 15525–15529.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp 15525–15529
Mots-clés : Sorption Adsorbent Résumé : A novel composite ion exchange adsorbent has been synthesized and characterized by using sophisticated techniques. The physicochemical parameters were also established to determine preliminary ion uptake properties of the exchanger. The material synthesized at pH 0.7, demonstrates promising ion exchange capacity (1.56 meq g–1 for Ba2+) together with chemical and thermal stability. It retains 76.4% ion exchange capacity up to 500 °C and shows higher uptake capacity than stannic selenite, stannic tungestoaresenate, and stannic molybdoaresenate. X-ray and SEM analyses show the amorphous nature of the material. On the basis of chemical composition and FTIR analysis a tentative formula has been assigned as (SnO2)(HMoO4)2(CH2CHCONH2) nH2O. The distribution coefficients behavior of material toward diverse metal ions was studied by varying the concentration of acid solvents. The practical usefulness of the material has been demonstrated by separating Cd2+ ions quantitatively from a synthetic mixture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014555 Exemplaires
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Titre : Styrene–butadiene–styrene triblock copolymer latex via reversible addition–fragmentation chain transfer miniemulsion polymerization Type de document : texte imprimé Auteurs : Renzhong Wei, Auteur ; Yingwu Luo, Auteur ; Wang Zeng, Auteur Année de publication : 2013 Article en page(s) : pp. 15530-15535 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Polymerization Fragmentation Résumé : It was demonstrated that gel-free styrene–butadiene–styrene triblock copolymer (SBS) latex with a molecular weight about 90 kg/mol and styrene composition about 34% could be synthesized by reversible addition–fragmentation chain transfer miniemulsion polymerization. The resulted SBS might be an excellent thermoplastic elastomer as indicated by its mechanical properties with ultimate tensile strength of 16 MPa and about 800% elongation at break. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679675
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15530-15535[article] Styrene–butadiene–styrene triblock copolymer latex via reversible addition–fragmentation chain transfer miniemulsion polymerization [texte imprimé] / Renzhong Wei, Auteur ; Yingwu Luo, Auteur ; Wang Zeng, Auteur . - 2013 . - pp. 15530-15535.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15530-15535
Mots-clés : Polymerization Fragmentation Résumé : It was demonstrated that gel-free styrene–butadiene–styrene triblock copolymer (SBS) latex with a molecular weight about 90 kg/mol and styrene composition about 34% could be synthesized by reversible addition–fragmentation chain transfer miniemulsion polymerization. The resulted SBS might be an excellent thermoplastic elastomer as indicated by its mechanical properties with ultimate tensile strength of 16 MPa and about 800% elongation at break. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679675 Exemplaires
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