Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
| Retourner au premier écran avec les recherches... |
Chemical engineering journal |
Dépouillements
Ajouter le résultat dans votre panierInsights into the modeling of adsorption isotherm systems / K.Y. Foo in Chemical engineering journal, Vol. 156 N° 1 (Janvier 2010)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 2-10
Titre : Insights into the modeling of adsorption isotherm systems Type de document : texte imprimé Auteurs : K.Y. Foo, Auteur ; B.H. Hameed, Auteur Année de publication : 2010 Article en page(s) : pp. 2-10 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Adsorption Isotherm Linear Nonlinear Error function Index. décimale : 660 Résumé : Concern about environmental protection has increased over the years from a global viewpoint. To date, the prevalence of adsorption separation in the environmental chemistry remains an aesthetic attention and consideration abroad the nations, owning to its low initial cost, simplicity of design, ease of operation, insensitivity to toxic substances and complete removal of pollutants even from dilute solutions. With the renaissance of isotherms modeling, there has been a steadily growing interest in this research field. Confirming the assertion, this paper presents a state of art review of adsorption isotherms modeling, its fundamental characteristics and mathematical derivations. Moreover, the key advance of the error functions, its utilization principles together with the comparisons of linearized and non-linearized isotherm models have been highlighted and discussed. Conclusively, the expanding of the nonlinear isotherms represents a potentially viable and powerful tool, leading to the superior improvement in the area of adsorption science.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235228%23 [...] [article] Insights into the modeling of adsorption isotherm systems [texte imprimé] / K.Y. Foo, Auteur ; B.H. Hameed, Auteur . - 2010 . - pp. 2-10.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 2-10
Mots-clés : Adsorption Isotherm Linear Nonlinear Error function Index. décimale : 660 Résumé : Concern about environmental protection has increased over the years from a global viewpoint. To date, the prevalence of adsorption separation in the environmental chemistry remains an aesthetic attention and consideration abroad the nations, owning to its low initial cost, simplicity of design, ease of operation, insensitivity to toxic substances and complete removal of pollutants even from dilute solutions. With the renaissance of isotherms modeling, there has been a steadily growing interest in this research field. Confirming the assertion, this paper presents a state of art review of adsorption isotherms modeling, its fundamental characteristics and mathematical derivations. Moreover, the key advance of the error functions, its utilization principles together with the comparisons of linearized and non-linearized isotherm models have been highlighted and discussed. Conclusively, the expanding of the nonlinear isotherms represents a potentially viable and powerful tool, leading to the superior improvement in the area of adsorption science.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235228%23 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 11-24
Titre : Natural zeolites as effective adsorbents in water and wastewater treatment Type de document : texte imprimé Auteurs : Shaobin Wang, Auteur ; Yuelian Peng, Auteur Année de publication : 2010 Article en page(s) : pp. 11-24 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Natural zeolite Adsorption Inorganic ions Organics Water treatment Index. décimale : 660 Résumé : Natural zeolites are abundant and low cost resources, which are crystalline hydrated aluminosilicates with a framework structure containing pores occupied by water, alkali and alkaline earth cations. Due to their high cation-exchange ability as well as to the molecular sieve properties, natural zeolites have been widely used as adsorbents in separation and purification processes in the past decades. In this paper, we review the recent development of natural zeolites as adsorbents in water and wastewater treatment. The properties and modification of natural zeolite are discussed. Various natural zeolites around the world have shown varying ion-exchange capacity for cations such as ammonium and heavy metal ions. Some zeolites also show adsorption of anions and organics from aqueous solution. Modification of natural zeolites can be done in several methods such as acid treatment, ion exchange, and surfactant functionalisation, making the modified zeolites achieving higher adsorption capacity for organics and anions.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XH0MVY-8&_user=6 [...] [article] Natural zeolites as effective adsorbents in water and wastewater treatment [texte imprimé] / Shaobin Wang, Auteur ; Yuelian Peng, Auteur . - 2010 . - pp. 11-24.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 11-24
Mots-clés : Natural zeolite Adsorption Inorganic ions Organics Water treatment Index. décimale : 660 Résumé : Natural zeolites are abundant and low cost resources, which are crystalline hydrated aluminosilicates with a framework structure containing pores occupied by water, alkali and alkaline earth cations. Due to their high cation-exchange ability as well as to the molecular sieve properties, natural zeolites have been widely used as adsorbents in separation and purification processes in the past decades. In this paper, we review the recent development of natural zeolites as adsorbents in water and wastewater treatment. The properties and modification of natural zeolite are discussed. Various natural zeolites around the world have shown varying ion-exchange capacity for cations such as ammonium and heavy metal ions. Some zeolites also show adsorption of anions and organics from aqueous solution. Modification of natural zeolites can be done in several methods such as acid treatment, ion exchange, and surfactant functionalisation, making the modified zeolites achieving higher adsorption capacity for organics and anions.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XH0MVY-8&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 25-32
Titre : Removal of fine particles in wet flue gas desulfurization system by heterogeneous condensation Type de document : texte imprimé Auteurs : Linjun Yang, Auteur ; Jingjing Bao, Auteur ; Jinpei Yan, Auteur Année de publication : 2010 Article en page(s) : pp. 25-32 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Wet flue gas desulfurization Heterogeneous condensation Fine particles Removal Index. décimale : 660 Résumé : A novel process to remove fine particles with high efficiency by heterogeneous condensation in a wet flue gas desulfurization (WFGD) system is presented. A supersaturated vapor phase, necessary for condensational growth of fine particles, was achieved in the SO2 absorption zone and at the top of the wet FGD scrubber by adding steam in the gas inlet and above the scrubbing liquid inlet of the scrubber, respectively. The condensational grown droplets were then removed by the scrubbing liquid and a high-efficiency demister. The results show that the effectiveness of the WFGD system for removal of fine particles is related to the SO2 absorbent employed. When using CaCO3 and NH3·H2O to remove SO2 from flue gas, the fine particle removal efficiencies are lower than those for Na2CO3 and water, and the morphology and elemental composition of fine particles are changed. This effect can be attributed to the formation of aerosol particles in the limestone and ammonia-based FGD processes. The performance of the WFGD system for removal of fine particles can be significantly improved for both steam addition cases, for which the removal efficiency increases with increasing amount of added steam. A high liquid to gas ratio is beneficial for efficient removal of fine particles by heterogeneous condensation of water vapor.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-1&_user=6 [...] [article] Removal of fine particles in wet flue gas desulfurization system by heterogeneous condensation [texte imprimé] / Linjun Yang, Auteur ; Jingjing Bao, Auteur ; Jinpei Yan, Auteur . - 2010 . - pp. 25-32.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 25-32
Mots-clés : Wet flue gas desulfurization Heterogeneous condensation Fine particles Removal Index. décimale : 660 Résumé : A novel process to remove fine particles with high efficiency by heterogeneous condensation in a wet flue gas desulfurization (WFGD) system is presented. A supersaturated vapor phase, necessary for condensational growth of fine particles, was achieved in the SO2 absorption zone and at the top of the wet FGD scrubber by adding steam in the gas inlet and above the scrubbing liquid inlet of the scrubber, respectively. The condensational grown droplets were then removed by the scrubbing liquid and a high-efficiency demister. The results show that the effectiveness of the WFGD system for removal of fine particles is related to the SO2 absorbent employed. When using CaCO3 and NH3·H2O to remove SO2 from flue gas, the fine particle removal efficiencies are lower than those for Na2CO3 and water, and the morphology and elemental composition of fine particles are changed. This effect can be attributed to the formation of aerosol particles in the limestone and ammonia-based FGD processes. The performance of the WFGD system for removal of fine particles can be significantly improved for both steam addition cases, for which the removal efficiency increases with increasing amount of added steam. A high liquid to gas ratio is beneficial for efficient removal of fine particles by heterogeneous condensation of water vapor.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-1&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 33-39
Titre : A study of gas transport through interfacially formed poly (N,N-dimethylaminoethyl methacrylate) membranes Type de document : texte imprimé Auteurs : Jennifer R. Du, Auteur ; Li Liu, Auteur ; Amit Chakma, Auteur Année de publication : 2010 Article en page(s) : pp. 33-39 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Gas separation Carbon dioxide Coupling effect Poly(N,N-dimethylaminoethyl methacrylate) Index. décimale : 660 Résumé : Gas transport through interfacially formed poly(N,N-dimethylaminoethyl methacrylate) membranes was investigated. The membrane performance for the separation of binary CO2/N2, CO2/CH4 and CO2/H2 mixtures was studied, and the coupling effects between the permeating species were evaluated by comparing the permeance of individual components in the mixture with their pure gas permeance. For the permeation of these binary gas mixtures, the presence of CO2 was shown to influence the permeation of the other components (i.e., N2, H2 and CH4), whereas the permeation of CO2 was not affected by these components. In consideration that water vapor is often encountered in applications involving CO2 separation, the presence of water vapor on the membrane permselectivity was also studied. When hydrated, the membrane was shown to be more permeable to CO2, while the membrane selectivity did not change significantly. Unlike membranes based on size-sieving of penetrant molecules, the present membranes exploit the favorable interactions between the hydrophilic quaternary amines in the membrane and CO2, especially in the presence of water vapor in the feed.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-1&_user=6 [...] [article] A study of gas transport through interfacially formed poly (N,N-dimethylaminoethyl methacrylate) membranes [texte imprimé] / Jennifer R. Du, Auteur ; Li Liu, Auteur ; Amit Chakma, Auteur . - 2010 . - pp. 33-39.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 33-39
Mots-clés : Gas separation Carbon dioxide Coupling effect Poly(N,N-dimethylaminoethyl methacrylate) Index. décimale : 660 Résumé : Gas transport through interfacially formed poly(N,N-dimethylaminoethyl methacrylate) membranes was investigated. The membrane performance for the separation of binary CO2/N2, CO2/CH4 and CO2/H2 mixtures was studied, and the coupling effects between the permeating species were evaluated by comparing the permeance of individual components in the mixture with their pure gas permeance. For the permeation of these binary gas mixtures, the presence of CO2 was shown to influence the permeation of the other components (i.e., N2, H2 and CH4), whereas the permeation of CO2 was not affected by these components. In consideration that water vapor is often encountered in applications involving CO2 separation, the presence of water vapor on the membrane permselectivity was also studied. When hydrated, the membrane was shown to be more permeable to CO2, while the membrane selectivity did not change significantly. Unlike membranes based on size-sieving of penetrant molecules, the present membranes exploit the favorable interactions between the hydrophilic quaternary amines in the membrane and CO2, especially in the presence of water vapor in the feed.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-1&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 40-48
Titre : Effect of increasing anode surface area on the performance of a single chamber microbial fuel cell Type de document : texte imprimé Auteurs : Mirella di Lorenzo, Auteur ; Keith Scott, Auteur ; Tom P. Curtis, Auteur Année de publication : 2010 Article en page(s) : pp. 40-48 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Microbial fuel cell Wastewater Tubular reactor Bio-anode Air cathode Graphite granules Index. décimale : 660 Résumé : The anode material and its configuration represent an important parameter in a microbial fuel cell (MFC), as it influences the development of the microbial community involved in the electrochemical bio-reactions.
The aim of this work was to evaluate single chamber microbial fuel cells (SCMFCs) with high anode surface area, achieved by using packed beds of irregular graphite granules. The performance of the SCMFC with the packed bed anode configuration was studied using a mixed microorganism culture from real wastewaters in batch and continuous mode operation.
The current output was found to increase with the increase in thickness of the anode bed and with the approximate anode area. The best performance was obtained with the 3 cm anode bed depth SCMFC. When the latter was operated in batch mode, Coulombic efficiencies varied from 30% to 74%, depending upon feed COD. In continuous mode operation, the COD removal was 89% and Coulombic efficiency 68% with a feed COD of 50 ppm, and at a flow rate of 0.0028 cm3 min−1. Power performance was also reasonable with a volumetric power density of 1.3 W m−3, with respect to the net anodic volume (12.5 cm3). Comparable performance was achieved with real wastewater. Over the duration of tests current output was stable. The investigation performed in this study represent a step forward for implementing real applications of MFC technology. A model of the current distribution in the packed bed electrode was applied, which correlates the effective utilization of the electrode to its specific area, solution conductivity and slope of the polarization curve. This model could function as a starting point in designing appropriate electrode geometries.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-2&_user=6 [...] [article] Effect of increasing anode surface area on the performance of a single chamber microbial fuel cell [texte imprimé] / Mirella di Lorenzo, Auteur ; Keith Scott, Auteur ; Tom P. Curtis, Auteur . - 2010 . - pp. 40-48.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 40-48
Mots-clés : Microbial fuel cell Wastewater Tubular reactor Bio-anode Air cathode Graphite granules Index. décimale : 660 Résumé : The anode material and its configuration represent an important parameter in a microbial fuel cell (MFC), as it influences the development of the microbial community involved in the electrochemical bio-reactions.
The aim of this work was to evaluate single chamber microbial fuel cells (SCMFCs) with high anode surface area, achieved by using packed beds of irregular graphite granules. The performance of the SCMFC with the packed bed anode configuration was studied using a mixed microorganism culture from real wastewaters in batch and continuous mode operation.
The current output was found to increase with the increase in thickness of the anode bed and with the approximate anode area. The best performance was obtained with the 3 cm anode bed depth SCMFC. When the latter was operated in batch mode, Coulombic efficiencies varied from 30% to 74%, depending upon feed COD. In continuous mode operation, the COD removal was 89% and Coulombic efficiency 68% with a feed COD of 50 ppm, and at a flow rate of 0.0028 cm3 min−1. Power performance was also reasonable with a volumetric power density of 1.3 W m−3, with respect to the net anodic volume (12.5 cm3). Comparable performance was achieved with real wastewater. Over the duration of tests current output was stable. The investigation performed in this study represent a step forward for implementing real applications of MFC technology. A model of the current distribution in the packed bed electrode was applied, which correlates the effective utilization of the electrode to its specific area, solution conductivity and slope of the polarization curve. This model could function as a starting point in designing appropriate electrode geometries.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-2&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 49-55
Titre : Miscanthus sinensis fractionation by different reagents Type de document : texte imprimé Auteurs : L. Serrano, Auteur ; I. Egues, Auteur ; M. González Alriols, Auteur Année de publication : 2010 Article en page(s) : pp. 49-55 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Miscanthus sinensis Soda Organosolv Cellulose Lignin Index. décimale : 660 Résumé : Miscanthus sinensis L. was fractionated by different reagents (ethanol, soda and soda–ethanol) in order to obtain cellulose, hemicelluloses and lignin. Characterization of original M. sinensis fibres (66.6% holocellulose, 36.1% α-cellulose, and 15.5% lignin) was done and compared with other biomass species chemical composition (alternative raw materials, agriculture residues, coniferous and leafy plants). Obtained solid fractions were chemically characterized and compared with solid fractions from other biomass products (palm oil empty fruit bunches (EFB) and rice straw) generated by similar fractionation processes (soda and organosolv). Soda process produced the solid fraction with the highest content in α-cellulose and lowest content in lignin revealing a strong fractionation effect. On the contrary, soda–ethanol process was found to present low fractionation capability. Obtained cellulose samples were characterized by FTIR to complete the chemical structure analysis. Lignin samples isolated from the liquid fractions were submitted to FTIR, 1H NMR, GPC, DSC and TGA in order to suggest suitable applications for the products based on their properties.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-8&_user=6 [...] [article] Miscanthus sinensis fractionation by different reagents [texte imprimé] / L. Serrano, Auteur ; I. Egues, Auteur ; M. González Alriols, Auteur . - 2010 . - pp. 49-55.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 49-55
Mots-clés : Miscanthus sinensis Soda Organosolv Cellulose Lignin Index. décimale : 660 Résumé : Miscanthus sinensis L. was fractionated by different reagents (ethanol, soda and soda–ethanol) in order to obtain cellulose, hemicelluloses and lignin. Characterization of original M. sinensis fibres (66.6% holocellulose, 36.1% α-cellulose, and 15.5% lignin) was done and compared with other biomass species chemical composition (alternative raw materials, agriculture residues, coniferous and leafy plants). Obtained solid fractions were chemically characterized and compared with solid fractions from other biomass products (palm oil empty fruit bunches (EFB) and rice straw) generated by similar fractionation processes (soda and organosolv). Soda process produced the solid fraction with the highest content in α-cellulose and lowest content in lignin revealing a strong fractionation effect. On the contrary, soda–ethanol process was found to present low fractionation capability. Obtained cellulose samples were characterized by FTIR to complete the chemical structure analysis. Lignin samples isolated from the liquid fractions were submitted to FTIR, 1H NMR, GPC, DSC and TGA in order to suggest suitable applications for the products based on their properties.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-8&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 56-63
Titre : Removal of perchlorate from aqueous solution using protonated cross-linked chitosan Type de document : texte imprimé Auteurs : Yanhua Xie, Auteur ; Shiyu Li, Auteur ; Wang, Fei, Auteur Année de publication : 2010 Article en page(s) : pp. 56-63 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Protonated cross-linked chitosan Perchlorate Adsorption Regeneration Index. décimale : 660 Résumé : Protonated cross-linked chitosan was used to remove perchlorate from aqueous solution. Adsorption isotherms, the effects of pH and co-existing anions on the adsorption process, proper actual contact time in the adsorption column and the regeneration ability of the adsorbent were investigated. The equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the maximum monolayer adsorption capacity was 45.455 mg g−1. To balance the protonated degree of the amino groups and the effect of the ion competing on adsorption capacity, the optimal pH value was determined to be about 4.0. Column adsorption results indicated that the proper actual contact time was 8.1 min and the effluent perchlorate could be steadily kept below 24.5 μg L−1 up to about 95 bed volumes with the influent perchlorate of 10 mg L−1. The presence of other anions weakened the perchlorate adsorption, especially the high valence anion such as sulfate. The adsorbents could be well regenerated by sodium hydroxide solution with pH 12 and reused at least for 15 cycles. Electrostatic attraction as well as physical force was the main driving force for perchlorate adsorption.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-9&_user=6 [...] [article] Removal of perchlorate from aqueous solution using protonated cross-linked chitosan [texte imprimé] / Yanhua Xie, Auteur ; Shiyu Li, Auteur ; Wang, Fei, Auteur . - 2010 . - pp. 56-63.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 56-63
Mots-clés : Protonated cross-linked chitosan Perchlorate Adsorption Regeneration Index. décimale : 660 Résumé : Protonated cross-linked chitosan was used to remove perchlorate from aqueous solution. Adsorption isotherms, the effects of pH and co-existing anions on the adsorption process, proper actual contact time in the adsorption column and the regeneration ability of the adsorbent were investigated. The equilibrium data fitted well with Langmuir and Freundlich isotherm models, and the maximum monolayer adsorption capacity was 45.455 mg g−1. To balance the protonated degree of the amino groups and the effect of the ion competing on adsorption capacity, the optimal pH value was determined to be about 4.0. Column adsorption results indicated that the proper actual contact time was 8.1 min and the effluent perchlorate could be steadily kept below 24.5 μg L−1 up to about 95 bed volumes with the influent perchlorate of 10 mg L−1. The presence of other anions weakened the perchlorate adsorption, especially the high valence anion such as sulfate. The adsorbents could be well regenerated by sodium hydroxide solution with pH 12 and reused at least for 15 cycles. Electrostatic attraction as well as physical force was the main driving force for perchlorate adsorption.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-9&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 64-69
Titre : Preparation and performance of a high purity poly-aluminum chloride Type de document : texte imprimé Auteurs : Fengting Li, Auteur ; Jia-Qian Jiang, Auteur ; Shengju Wu, Auteur Année de publication : 2010 Article en page(s) : pp. 64-69 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Aluminate Basicity Bauxite Coagulation Poly-aluminum chloride (PACl) Water treatment Index. décimale : 660 Résumé : Poly-aluminum chloride (PACl) is one of the common coagulants for water and wastewater treatment. A new Chinese national standard of PACl has been implemented, where the concentration of insoluble substances, iron and heavy metals is to be controlled strictly, then researches on the preparation of high-purity PACl are needed. This paper presents a novel method to prepare high-purity PACl which contains high aluminum oxide content (>10%), high basicity (>90%), and low insoluble substance (<0.04%), iron (<300 mg L−1) and heavy metals. Samples taken from the Huangpu River were used to evaluate the coagulation performance of high-purity PACl in comparison with conventional PACl. The results demonstrate that for the whole dose range studied, high-purity PACls removed more turbidity than conventional PACl. On the other hand, when the dose was greater than 4 mg L−1 as Al, the high-purity PACl showed great UV254-absorbance removal capacity; which was even much greater at high does (e.g., 10 mg L−1). This could be partly attributed to the charge effect where a relative high zeta potential in the test water was achieved by dosing high-purity PACl.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-B&_user=6 [...] [article] Preparation and performance of a high purity poly-aluminum chloride [texte imprimé] / Fengting Li, Auteur ; Jia-Qian Jiang, Auteur ; Shengju Wu, Auteur . - 2010 . - pp. 64-69.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 64-69
Mots-clés : Aluminate Basicity Bauxite Coagulation Poly-aluminum chloride (PACl) Water treatment Index. décimale : 660 Résumé : Poly-aluminum chloride (PACl) is one of the common coagulants for water and wastewater treatment. A new Chinese national standard of PACl has been implemented, where the concentration of insoluble substances, iron and heavy metals is to be controlled strictly, then researches on the preparation of high-purity PACl are needed. This paper presents a novel method to prepare high-purity PACl which contains high aluminum oxide content (>10%), high basicity (>90%), and low insoluble substance (<0.04%), iron (<300 mg L−1) and heavy metals. Samples taken from the Huangpu River were used to evaluate the coagulation performance of high-purity PACl in comparison with conventional PACl. The results demonstrate that for the whole dose range studied, high-purity PACls removed more turbidity than conventional PACl. On the other hand, when the dose was greater than 4 mg L−1 as Al, the high-purity PACl showed great UV254-absorbance removal capacity; which was even much greater at high does (e.g., 10 mg L−1). This could be partly attributed to the charge effect where a relative high zeta potential in the test water was achieved by dosing high-purity PACl.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X9NVBP-B&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 70-76
Titre : Structural effects on the interactions of benzene and naphthalene sulfonates with activated carbon cloth during adsorption from aqueous solutions Type de document : texte imprimé Auteurs : Erol Ayranci, Auteur ; Osman Duman, Auteur Année de publication : 2010 Article en page(s) : pp. 70-76 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Adsorption kinetics Adsorption isotherm Activated carbon cloth Benzene sulfonates Naphthalene sulfonates In-situ UV spectroscopy Résumé : Interactions of benzene and naphthalene sulfonates with activated carbon cloth (ACC) during adsorption from aqueous solutions were investigated. Systematically chosen sulfonates were sodium salt of benzene sulfonic acid (NaBS), disodium salt of 1,3-benzene disulfonic acid (Na2BDS), sodium salt of 1-naphthalene sulfonic acid (NaNS), disodium salt of 1,5-naphthalene disulfonic acid (Na2NDS) and trisodium salt of 1,3,(6 or 7)-naphthalene trisulfonic acid (Na3NTS). The adsorption behaviors of these adsorbates from solutions in water and in 0.01 M H2SO4 onto the ACC were monitored by in-situ UV–visible spectroscopic technique. The order of rates and extents of adsorption of sulfonates were explained in terms of acidity of the medium and structural factors influencing the interactions between sulfonates and the ACC surface. Kinetic data of adsorption were treated according to pseudo first-order, pseudo second-order, Elovich and intra-particle diffusion models. The best model representing the experimental kinetic data was found to be the pseudo second-order model. Adsorption isotherms of the sulfonates onto the ACC were derived at 30 °C. Isotherm data were found to fit the Freundlich model better than the Langmuir model.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-3&_user=6 [...] [article] Structural effects on the interactions of benzene and naphthalene sulfonates with activated carbon cloth during adsorption from aqueous solutions [texte imprimé] / Erol Ayranci, Auteur ; Osman Duman, Auteur . - 2010 . - pp. 70-76.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 70-76
Mots-clés : Adsorption kinetics Adsorption isotherm Activated carbon cloth Benzene sulfonates Naphthalene sulfonates In-situ UV spectroscopy Résumé : Interactions of benzene and naphthalene sulfonates with activated carbon cloth (ACC) during adsorption from aqueous solutions were investigated. Systematically chosen sulfonates were sodium salt of benzene sulfonic acid (NaBS), disodium salt of 1,3-benzene disulfonic acid (Na2BDS), sodium salt of 1-naphthalene sulfonic acid (NaNS), disodium salt of 1,5-naphthalene disulfonic acid (Na2NDS) and trisodium salt of 1,3,(6 or 7)-naphthalene trisulfonic acid (Na3NTS). The adsorption behaviors of these adsorbates from solutions in water and in 0.01 M H2SO4 onto the ACC were monitored by in-situ UV–visible spectroscopic technique. The order of rates and extents of adsorption of sulfonates were explained in terms of acidity of the medium and structural factors influencing the interactions between sulfonates and the ACC surface. Kinetic data of adsorption were treated according to pseudo first-order, pseudo second-order, Elovich and intra-particle diffusion models. The best model representing the experimental kinetic data was found to be the pseudo second-order model. Adsorption isotherms of the sulfonates onto the ACC were derived at 30 °C. Isotherm data were found to fit the Freundlich model better than the Langmuir model.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XB79WP-3&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 77-82
Titre : Removal of p-nitrophenol using hydrodynamic cavitation and Fenton chemistry at pilot scale operation Type de document : texte imprimé Auteurs : Amey A. Pradhan, Auteur ; Parag R. Gogate, Auteur Année de publication : 2010 Article en page(s) : pp. 77-82 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Wastewater treatment p-Nitrophenol Hydrodynamic cavitation Venturi Orifice plate Fenton's reagent Index. décimale : 660 Résumé : In the current work removal of p-nitrophenol has been investigated using hydrodynamic cavitation, either operated individually or in combination with H2O2 and conventional Fenton process. In hydrodynamic cavitation, two different cavitating devices viz. orifice plate and venturi have been used. Effect of different operating parameters such as initial concentration (5 g/l and 10 g/l), inlet pressure (over a range 5.7–42.6 psi) and pH (over a range 2–8) on the extent of removal has been investigated. In conventional Fenton process two loadings of FeSO4, 0.5 g/l and 1 g/l were investigated and three ratios of FeSO4:H2O2 viz. 1:5, 1:7.5 and 1:10 were used. Removal observed with venturi was higher than with orifice plate in combination with Fenton chemistry. For 5 g/l initial concentration of p-nitrophenol, maximum removal of 63.2% was observed whereas for 10 g/l solution it was 56.2%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XDCHT4-1&_user=6 [...] [article] Removal of p-nitrophenol using hydrodynamic cavitation and Fenton chemistry at pilot scale operation [texte imprimé] / Amey A. Pradhan, Auteur ; Parag R. Gogate, Auteur . - 2010 . - pp. 77-82.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 77-82
Mots-clés : Wastewater treatment p-Nitrophenol Hydrodynamic cavitation Venturi Orifice plate Fenton's reagent Index. décimale : 660 Résumé : In the current work removal of p-nitrophenol has been investigated using hydrodynamic cavitation, either operated individually or in combination with H2O2 and conventional Fenton process. In hydrodynamic cavitation, two different cavitating devices viz. orifice plate and venturi have been used. Effect of different operating parameters such as initial concentration (5 g/l and 10 g/l), inlet pressure (over a range 5.7–42.6 psi) and pH (over a range 2–8) on the extent of removal has been investigated. In conventional Fenton process two loadings of FeSO4, 0.5 g/l and 1 g/l were investigated and three ratios of FeSO4:H2O2 viz. 1:5, 1:7.5 and 1:10 were used. Removal observed with venturi was higher than with orifice plate in combination with Fenton chemistry. For 5 g/l initial concentration of p-nitrophenol, maximum removal of 63.2% was observed whereas for 10 g/l solution it was 56.2%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XDCHT4-1&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 83-91
Titre : Coagulation of bentonite suspension by polyelectrolytes or ferric chloride : floc breakage and reformation Type de document : texte imprimé Auteurs : E. Barbot, Auteur ; P. Dussouillez, Auteur ; J. Y. Bottero, Auteur Année de publication : 2010 Article en page(s) : pp. 83-91 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Coagulation Flocculation Ferric chloride Polyelectrolytes Shear stress Laser granulometry Index. décimale : 660 Résumé : Coagulation process usually involves different hydrodynamic conditions, in particular when it is followed by a filtration step. In this study, coagulation performance was investigated under a wide range of shear stress. Floc behaviour was followed in-line by laser granulometry to determine size distribution and structure. Synthetic suspension of bentonite in tap water was used as a reference for mineral solids in surface water. Three cationic polymers (polyamine based and polyDADMAC) and ferric chloride were tested using different coagulation reactor geometries. Jar-test indicated coagulation performance under mild hydrodynamic conditions and Taylor–Couette reactors were used to create shear stresses up to 8 Pa. Flocs formed with ferric chloride are not able to grow under middle shear stress like 1.5 Pa. On the contrary, polyelectrolytes lead to large flocs, dense (Df = 2.6) and resistant to shear stress. A qualitative comparison of floc resistance to shear depending on hydrodynamic conditions and coagulant type is given through the calculation of the strength factor. Fractal dimension measurements indicate a mechanism of particle erosion when flocs are subjected to a higher shear stress in Taylor–Couette reactor. Floc re-growth is also investigated, and breakage appears to be non-reversible regardless of coagulant and conditions experimented.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-1&_user=6 [...] [article] Coagulation of bentonite suspension by polyelectrolytes or ferric chloride : floc breakage and reformation [texte imprimé] / E. Barbot, Auteur ; P. Dussouillez, Auteur ; J. Y. Bottero, Auteur . - 2010 . - pp. 83-91.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 83-91
Mots-clés : Coagulation Flocculation Ferric chloride Polyelectrolytes Shear stress Laser granulometry Index. décimale : 660 Résumé : Coagulation process usually involves different hydrodynamic conditions, in particular when it is followed by a filtration step. In this study, coagulation performance was investigated under a wide range of shear stress. Floc behaviour was followed in-line by laser granulometry to determine size distribution and structure. Synthetic suspension of bentonite in tap water was used as a reference for mineral solids in surface water. Three cationic polymers (polyamine based and polyDADMAC) and ferric chloride were tested using different coagulation reactor geometries. Jar-test indicated coagulation performance under mild hydrodynamic conditions and Taylor–Couette reactors were used to create shear stresses up to 8 Pa. Flocs formed with ferric chloride are not able to grow under middle shear stress like 1.5 Pa. On the contrary, polyelectrolytes lead to large flocs, dense (Df = 2.6) and resistant to shear stress. A qualitative comparison of floc resistance to shear depending on hydrodynamic conditions and coagulant type is given through the calculation of the strength factor. Fractal dimension measurements indicate a mechanism of particle erosion when flocs are subjected to a higher shear stress in Taylor–Couette reactor. Floc re-growth is also investigated, and breakage appears to be non-reversible regardless of coagulant and conditions experimented.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-1&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 92-97
Titre : Dynamics and oxygen transfer of a novel vertical tubular biological reactor for wastewater treatment Type de document : texte imprimé Auteurs : Yanli Xu, Auteur ; Jiti Zhou, Auteur ; Yuanyuan Qu, Auteur Année de publication : 2010 Article en page(s) : pp. 92-97 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Oxygen transfer Dynamic model Vertical tubular bioreactor Wastewater Index. décimale : 660 Résumé : Dynamics and oxygen transfer of a novel vertical tubular biological reactor (VTBR) for wastewater treatment were investigated in this paper. It was showed that the dissolved oxygen concentration (DO) in VTBR is higher than that in the conventional bubble column. When the ratio of gas and liquid flow rates was greater than 6.44, there were no phenomena of deficiency oxygen in all reactors. The volume oxygen transfer coefficient (kLa) was between 0.005 and 0.025 1/s. The multi-stage series CSTR and PFR model were developed to describe the dynamics of VTBR. It was revealed that the PFR model was proper to describe the dynamics of VTBR of which maximum error was only 25%. The industrial effluents from Dalian Bangchui Island Beer Company were utilized to verify the two models. It was suggested that when the ratio of gas–liquid was greater than 6.44, the removal efficiency of COD could be obtained more than 80%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-3&_user=6 [...] [article] Dynamics and oxygen transfer of a novel vertical tubular biological reactor for wastewater treatment [texte imprimé] / Yanli Xu, Auteur ; Jiti Zhou, Auteur ; Yuanyuan Qu, Auteur . - 2010 . - pp. 92-97.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 92-97
Mots-clés : Oxygen transfer Dynamic model Vertical tubular bioreactor Wastewater Index. décimale : 660 Résumé : Dynamics and oxygen transfer of a novel vertical tubular biological reactor (VTBR) for wastewater treatment were investigated in this paper. It was showed that the dissolved oxygen concentration (DO) in VTBR is higher than that in the conventional bubble column. When the ratio of gas and liquid flow rates was greater than 6.44, there were no phenomena of deficiency oxygen in all reactors. The volume oxygen transfer coefficient (kLa) was between 0.005 and 0.025 1/s. The multi-stage series CSTR and PFR model were developed to describe the dynamics of VTBR. It was revealed that the PFR model was proper to describe the dynamics of VTBR of which maximum error was only 25%. The industrial effluents from Dalian Bangchui Island Beer Company were utilized to verify the two models. It was suggested that when the ratio of gas–liquid was greater than 6.44, the removal efficiency of COD could be obtained more than 80%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-3&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 98-105
Titre : Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface Type de document : texte imprimé Auteurs : Xiangyu Cao, Auteur ; Yasuhiro Oda, Auteur ; Fumihide Shiraishi, Auteur Année de publication : 2010 Article en page(s) : pp. 98-105 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Photocatalytic reaction Titanium dioxide Activated carbon Adsorption Batch-recirculation reactor Index. décimale : 660 Résumé : Anatase titanium dioxide (TiO2) in particle sizes of roughly 0.5–20 μm was prepared from amorphous TiO2 in an aqueous H2O2 solution by heating at 90 °C for 9 h and directly deposited on a PET film. On the other hand, granular activated carbon (AC) particles in sizes of 1–2 mm in diameter were adhesively deposited on a PET film, and their surfaces were also coated with TiO2. The resulting three preparations (TiO2-, AC-, and TiO2/AC-PET films) were set up in an annular-flow reactor to treat aqueous solutions of 2,4-dinitrophenol (DNP) in a batch-recirculation mode. The rate of DNP adsorption onto the TiO2/AC-PET film without UV irradiation was almost the same as that onto the AC-PET film, indicating that the attraction of DNP to AC was not lowered in the presence of TiO2 film. Observation of SEM photographs suggests that this result is attributed to the porous structure of the thin TiO2 film covering AC particles. The rate of DNP removal by the TiO2-AC PET film under UV irradiation was 2.9 times higher than that by the TiO2-PET film under UV irradiation, and was 1.1 times higher than the rate of DNP adsorption onto the AC-PET film. The rate of DNP removal by the AC-PET film decreased by 40% after six runs, while that by the TiO2/AC-PET film decreased by 22%. Durable experiments using the TiO2/AC-PET and AC-PET films clarified that the lifetime of the TiO2/AC-PET film is at least two times longer than that of the AC-PET film. This result suggests that DNP molecules are photocatalytically decomposed when passing through the porous TiO2-PET film, which lessens a burden of DNP adsorption on AC. Moreover, the DNP treatments in the batch-recirculation flow system suggested that the TiO2/AC-PET film saturated with DNP can be successfully regenerated at 60 °C.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-4&_user=6 [...] [article] Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface [texte imprimé] / Xiangyu Cao, Auteur ; Yasuhiro Oda, Auteur ; Fumihide Shiraishi, Auteur . - 2010 . - pp. 98-105.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 98-105
Mots-clés : Photocatalytic reaction Titanium dioxide Activated carbon Adsorption Batch-recirculation reactor Index. décimale : 660 Résumé : Anatase titanium dioxide (TiO2) in particle sizes of roughly 0.5–20 μm was prepared from amorphous TiO2 in an aqueous H2O2 solution by heating at 90 °C for 9 h and directly deposited on a PET film. On the other hand, granular activated carbon (AC) particles in sizes of 1–2 mm in diameter were adhesively deposited on a PET film, and their surfaces were also coated with TiO2. The resulting three preparations (TiO2-, AC-, and TiO2/AC-PET films) were set up in an annular-flow reactor to treat aqueous solutions of 2,4-dinitrophenol (DNP) in a batch-recirculation mode. The rate of DNP adsorption onto the TiO2/AC-PET film without UV irradiation was almost the same as that onto the AC-PET film, indicating that the attraction of DNP to AC was not lowered in the presence of TiO2 film. Observation of SEM photographs suggests that this result is attributed to the porous structure of the thin TiO2 film covering AC particles. The rate of DNP removal by the TiO2-AC PET film under UV irradiation was 2.9 times higher than that by the TiO2-PET film under UV irradiation, and was 1.1 times higher than the rate of DNP adsorption onto the AC-PET film. The rate of DNP removal by the AC-PET film decreased by 40% after six runs, while that by the TiO2/AC-PET film decreased by 22%. Durable experiments using the TiO2/AC-PET and AC-PET films clarified that the lifetime of the TiO2/AC-PET film is at least two times longer than that of the AC-PET film. This result suggests that DNP molecules are photocatalytically decomposed when passing through the porous TiO2-PET film, which lessens a burden of DNP adsorption on AC. Moreover, the DNP treatments in the batch-recirculation flow system suggested that the TiO2/AC-PET film saturated with DNP can be successfully regenerated at 60 °C.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-4&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 106-113
Titre : Utilization of Fennel biomass (Foeniculum vulgari) a medicinal herb for the biosorption of Cd(II) from aqueous phase Type de document : texte imprimé Auteurs : Rifaqat Ali Khan Rao, Auteur ; Moonis Ali Khan, Auteur ; Fouzia Rehman, Auteur Année de publication : 2010 Article en page(s) : pp. 106-113 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Fennel biomass Regeneration Biosorption Desorption Breakthrough capacity Index. décimale : 660 Résumé : This work presents the biosorption potential of Fennel biomass for the effective removal of Cd(II) ions. The biosorption was maximum (92%) at pH 4.3. Maximum biosorption capacities of Cd(II) at 30, 40 and 50 °C temperatures were 21, 24 and 30 mg/g, respectively. The biosorption of Cd(II) was concentration dependent and increases from 0.49 to 9.3 mg/g with increase in concentration from 5 to 100 mg/L. Biosorption follows Freundlich isotherm at 50 °C. Mean free energies at different temperatures were in between 7.1 and 11.95 kJ/mol indicating chemical nature of biosorption process. Kinetics studies showed that pseudo-second-order kinetics model was applicable to the data. The process was endothermic and spontaneous, the spontaneity of the process increases with increase in temperature. Regeneration studies showed a decrease in the recovery of Cd(II) from 99.8% to 41.7% in five consecutive cycles. 80% of the Cd(II) in single and multi-metal systems was recovered in 10 mL. Breakthrough and exhaustive capacities of Cd(II) in single metal system were 10 and 40 mg/g. For multi-metal systems in double distilled water the breakthrough and exhaustive capacities of Cd(II) were 2 and 12 mg/g. In saline solution the breakthrough and exhaustive capacities of Cd(II) were 0.8 and 4 mg/g.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-2&_user=6 [...] [article] Utilization of Fennel biomass (Foeniculum vulgari) a medicinal herb for the biosorption of Cd(II) from aqueous phase [texte imprimé] / Rifaqat Ali Khan Rao, Auteur ; Moonis Ali Khan, Auteur ; Fouzia Rehman, Auteur . - 2010 . - pp. 106-113.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 106-113
Mots-clés : Fennel biomass Regeneration Biosorption Desorption Breakthrough capacity Index. décimale : 660 Résumé : This work presents the biosorption potential of Fennel biomass for the effective removal of Cd(II) ions. The biosorption was maximum (92%) at pH 4.3. Maximum biosorption capacities of Cd(II) at 30, 40 and 50 °C temperatures were 21, 24 and 30 mg/g, respectively. The biosorption of Cd(II) was concentration dependent and increases from 0.49 to 9.3 mg/g with increase in concentration from 5 to 100 mg/L. Biosorption follows Freundlich isotherm at 50 °C. Mean free energies at different temperatures were in between 7.1 and 11.95 kJ/mol indicating chemical nature of biosorption process. Kinetics studies showed that pseudo-second-order kinetics model was applicable to the data. The process was endothermic and spontaneous, the spontaneity of the process increases with increase in temperature. Regeneration studies showed a decrease in the recovery of Cd(II) from 99.8% to 41.7% in five consecutive cycles. 80% of the Cd(II) in single and multi-metal systems was recovered in 10 mL. Breakthrough and exhaustive capacities of Cd(II) in single metal system were 10 and 40 mg/g. For multi-metal systems in double distilled water the breakthrough and exhaustive capacities of Cd(II) were 2 and 12 mg/g. In saline solution the breakthrough and exhaustive capacities of Cd(II) were 0.8 and 4 mg/g.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-2&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 114-120
Titre : Colour removal of three reactive dyes by UV light exposure after electrochemical treatment Type de document : texte imprimé Auteurs : M. Riera-Torres, Auteur ; Maria-Carmen Gutiérrez, Auteur Année de publication : 2010 Article en page(s) : pp. 114-120 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Reactive dye Decolourization UV light Textile wastewater Dyeing bath GCMS Index. décimale : 660 Résumé : This study applies UV light irradiation after a low current density electrochemical treatment to degrade reactive dyes to remove wastewater colour. The combination of these two techniques improves the quality of the treated effluent with respect to only an electrochemical treatment. Synthetic dyeing effluents containing a reactive dye (C.I. Reactive Orange 4, C.I. Reactive Black 5 or Procion Navy H-EXL) and Na2SO4 were studied. Ti/Pt oxides electrodes and UV irradiation lamp (6 W, 254 nm maximum emission) were used. Kinetic constants of the UV irradiation step were calculated. The influence of chloride ion at 3 and 6 mA/cm2 was evaluated. Results showed that, with a very small Cl− concentration (in the order of the net water content) the combined techniques provided full decolourization. The possible presence of 25 organic halogenated compounds was studied by gas chromatography–mass spectrophotometry (GCMS). Only four of them were detected after the electrochemical treatment at low intensity, mainly chloroform. Its concentration was found to be highly dependent of the Cl− concentration, being much lower when reducing the amount of chloride ion. In all cases, the chloroform concentration was dramatically reduced by further UV irradiation which destroyed it up to a 75%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-6&_user=6 [...] [article] Colour removal of three reactive dyes by UV light exposure after electrochemical treatment [texte imprimé] / M. Riera-Torres, Auteur ; Maria-Carmen Gutiérrez, Auteur . - 2010 . - pp. 114-120.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 114-120
Mots-clés : Reactive dye Decolourization UV light Textile wastewater Dyeing bath GCMS Index. décimale : 660 Résumé : This study applies UV light irradiation after a low current density electrochemical treatment to degrade reactive dyes to remove wastewater colour. The combination of these two techniques improves the quality of the treated effluent with respect to only an electrochemical treatment. Synthetic dyeing effluents containing a reactive dye (C.I. Reactive Orange 4, C.I. Reactive Black 5 or Procion Navy H-EXL) and Na2SO4 were studied. Ti/Pt oxides electrodes and UV irradiation lamp (6 W, 254 nm maximum emission) were used. Kinetic constants of the UV irradiation step were calculated. The influence of chloride ion at 3 and 6 mA/cm2 was evaluated. Results showed that, with a very small Cl− concentration (in the order of the net water content) the combined techniques provided full decolourization. The possible presence of 25 organic halogenated compounds was studied by gas chromatography–mass spectrophotometry (GCMS). Only four of them were detected after the electrochemical treatment at low intensity, mainly chloroform. Its concentration was found to be highly dependent of the Cl− concentration, being much lower when reducing the amount of chloride ion. In all cases, the chloroform concentration was dramatically reduced by further UV irradiation which destroyed it up to a 75%.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-6&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 121-133
Titre : Decolourization of the reconstituted dye bath effluent by commercial laccase treatment : optimization through response surface methodology Type de document : texte imprimé Auteurs : Imen Khouni, Auteur ; Benoît Marrot, Auteur ; Raja Ben Amar, Auteur Année de publication : 2010 Article en page(s) : pp. 121-133 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Decolourization Response surface methodology (RSM) Central composite design (CCD) Laccase Synthetics dyes bath effluents Index. décimale : 660 Résumé : This paper aims to study the effect of temperature, pH and enzyme concentration on decolourization of separately two reactive textile dyes (Black Novacron R and Blue Bezaktiv S-GLD 150) used in reconstituted dye bath effluent (textile dye and auxiliary components) and in aqueous dye solutions (dye dissolved in deionised water) by a commercial laccase formulation (DeniLite® IIS). The central composite design (CCD) matrix and response surface methodology (RSM) have been applied to design experiments for the evaluation of the interactive effects of the three most important operating variables: temperature ‘T’ (25–45 °C), pH (3.0–7.0), and enzyme concentration ‘EC’ (80–240 U/L) on the enzymatic decolourization of the different synthetic dyes solutions at initial dye concentration of 40 mg/L. The RSM indicated that the optimum parameter values were respectively for the reconstituted Black Novacron R and the Blue Bezaktiv S-GLD 150 effluents: T = 43 °C and 41.44 °C, pH 6 and 6.29, EC = 222 and 226.43 U/L. The maximum colour removal was about 98.9% at 593 nm and 79.9% at 400 nm for reconstituted Black Novacron R effluent and about 98.9% at 620 nm for reconstituted Blue Bezaktiv S-GLD 150 effluent. For aqueous dye solutions, RSM has shown that colour removal obtained were quite similar. However, the optimum parameters were different. Hence, enzyme concentration depends on the effluent component.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-7&_user=6 [...] [article] Decolourization of the reconstituted dye bath effluent by commercial laccase treatment : optimization through response surface methodology [texte imprimé] / Imen Khouni, Auteur ; Benoît Marrot, Auteur ; Raja Ben Amar, Auteur . - 2010 . - pp. 121-133.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 121-133
Mots-clés : Decolourization Response surface methodology (RSM) Central composite design (CCD) Laccase Synthetics dyes bath effluents Index. décimale : 660 Résumé : This paper aims to study the effect of temperature, pH and enzyme concentration on decolourization of separately two reactive textile dyes (Black Novacron R and Blue Bezaktiv S-GLD 150) used in reconstituted dye bath effluent (textile dye and auxiliary components) and in aqueous dye solutions (dye dissolved in deionised water) by a commercial laccase formulation (DeniLite® IIS). The central composite design (CCD) matrix and response surface methodology (RSM) have been applied to design experiments for the evaluation of the interactive effects of the three most important operating variables: temperature ‘T’ (25–45 °C), pH (3.0–7.0), and enzyme concentration ‘EC’ (80–240 U/L) on the enzymatic decolourization of the different synthetic dyes solutions at initial dye concentration of 40 mg/L. The RSM indicated that the optimum parameter values were respectively for the reconstituted Black Novacron R and the Blue Bezaktiv S-GLD 150 effluents: T = 43 °C and 41.44 °C, pH 6 and 6.29, EC = 222 and 226.43 U/L. The maximum colour removal was about 98.9% at 593 nm and 79.9% at 400 nm for reconstituted Black Novacron R effluent and about 98.9% at 620 nm for reconstituted Blue Bezaktiv S-GLD 150 effluent. For aqueous dye solutions, RSM has shown that colour removal obtained were quite similar. However, the optimum parameters were different. Hence, enzyme concentration depends on the effluent component.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-7&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 134-140
Titre : Adsorption behavior of Li+ onto nano-lithium ion sieve from hybrid magnesium/lithium manganese oxide Type de document : texte imprimé Auteurs : Liyan Tian, Auteur ; Wei Ma, Auteur ; Mei Han, Auteur Année de publication : 2010 Article en page(s) : pp. 134-140 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Adsorption Lithium Lithium ion sieve Modeling Kinetics Index. décimale : 660 Résumé : Magnesium (II) doped spinel lithium manganese oxide (LMS) was synthesized by soft chemical method and nanosized ion sieve manganese oxide (HMS) was prepared by extracting lithium and magnesium from LMS. The characteristics of HMS were studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, surface areas and determination of pH at the point of zero charge. Experiments were performed to study the effects of pH, adsorbent dose, contact time and Li+ concentration. The competitive model was used to describe the competition between Li+–H+ and the applicability of different kinetic models was evaluated. The results showed that the pH at the point of zero charge of HMS was about 7.8. The recycle of HMS explained that it could be used as Li+ adsorbent with topotactical extraction of lithium. Under optimized batch conditions up to 99.2% Li+ could be recovered from solution within 24 h. The adsorption process followed the pseudo-second-order model and followed an intraparticle diffusion model at the beginning.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-8&_user=6 [...] [article] Adsorption behavior of Li+ onto nano-lithium ion sieve from hybrid magnesium/lithium manganese oxide [texte imprimé] / Liyan Tian, Auteur ; Wei Ma, Auteur ; Mei Han, Auteur . - 2010 . - pp. 134-140.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 134-140
Mots-clés : Adsorption Lithium Lithium ion sieve Modeling Kinetics Index. décimale : 660 Résumé : Magnesium (II) doped spinel lithium manganese oxide (LMS) was synthesized by soft chemical method and nanosized ion sieve manganese oxide (HMS) was prepared by extracting lithium and magnesium from LMS. The characteristics of HMS were studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, surface areas and determination of pH at the point of zero charge. Experiments were performed to study the effects of pH, adsorbent dose, contact time and Li+ concentration. The competitive model was used to describe the competition between Li+–H+ and the applicability of different kinetic models was evaluated. The results showed that the pH at the point of zero charge of HMS was about 7.8. The recycle of HMS explained that it could be used as Li+ adsorbent with topotactical extraction of lithium. Under optimized batch conditions up to 99.2% Li+ could be recovered from solution within 24 h. The adsorption process followed the pseudo-second-order model and followed an intraparticle diffusion model at the beginning.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XF840K-8&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 141-145
Titre : Regeneration and reuse of spent NaOH-treated oil palm frond for copper and zinc removal from wastewater Type de document : texte imprimé Auteurs : Babak Salamatinia, Auteur ; Azlina Harun Kamaruddin, Auteur ; Ahmad Zuhairi Abdullah, Auteur Année de publication : 2010 Article en page(s) : pp. 141-145 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Spent sorbent NaOH-treated oil palm frond Heavy metal Regeneration Reuse Index. décimale : 660 Résumé : The use of NaOH-treated oil palm frond (OPF) sorbent for Cu and Zn removal and its subsequent regeneration process are reported. The regeneration of the spent sorbent was achieved by desorbing the metals in 0.1 M of sodium hydroxide (NaOH), ethylene diamine tetraacetic acid (EDTA), hydrochloric acid (HCl) and nitric acid (HNO3) solutions. The reusability study of the sorbent was conducted using 100 mg/l of Cu and Zn at a pH of 4.5 and 5.5, respectively for 1 h. The results were to be correlated with the mechanism of the metal uptake. Freundlich isotherm fitted the data to indicate the presence of heterogeneous metal sorption sites. Zn showed better regeneration efficiency of up to 88% and HCl was the best regeneration agent. The results confirmed that ion exchange was the main mechanism for the metal uptake. The desorption efficiency dropped by merely about 20% while the sorption capacity experienced a drastic drop after reuse for the fourth cycle. The damage occurred on the heavy metal binding sites by the strong acid was responsible for this drop.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-6&_user=6 [...] [article] Regeneration and reuse of spent NaOH-treated oil palm frond for copper and zinc removal from wastewater [texte imprimé] / Babak Salamatinia, Auteur ; Azlina Harun Kamaruddin, Auteur ; Ahmad Zuhairi Abdullah, Auteur . - 2010 . - pp. 141-145.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 141-145
Mots-clés : Spent sorbent NaOH-treated oil palm frond Heavy metal Regeneration Reuse Index. décimale : 660 Résumé : The use of NaOH-treated oil palm frond (OPF) sorbent for Cu and Zn removal and its subsequent regeneration process are reported. The regeneration of the spent sorbent was achieved by desorbing the metals in 0.1 M of sodium hydroxide (NaOH), ethylene diamine tetraacetic acid (EDTA), hydrochloric acid (HCl) and nitric acid (HNO3) solutions. The reusability study of the sorbent was conducted using 100 mg/l of Cu and Zn at a pH of 4.5 and 5.5, respectively for 1 h. The results were to be correlated with the mechanism of the metal uptake. Freundlich isotherm fitted the data to indicate the presence of heterogeneous metal sorption sites. Zn showed better regeneration efficiency of up to 88% and HCl was the best regeneration agent. The results confirmed that ion exchange was the main mechanism for the metal uptake. The desorption efficiency dropped by merely about 20% while the sorption capacity experienced a drastic drop after reuse for the fourth cycle. The damage occurred on the heavy metal binding sites by the strong acid was responsible for this drop.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-6&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 146-156
Titre : Heavy metals uptake from aqueous solutions and industrial wastewaters by humic acid-immobilized polymer/bentonite composite : kinetics and equilibrium modeling Type de document : texte imprimé Auteurs : T. S. Anirudhan, Auteur ; P.S. Suchithra, Auteur Année de publication : 2010 Article en page(s) : pp. 146-156 Note générale : Génie Chimique-
Langues : Anglais (eng) Mots-clés : Humic acid Polymer/clay composite Heavy metal ion Adsorption Wastewater Regeneration Index. décimale : 660 Résumé : This study explored the feasibility of utilizing a novel adsorbent, humic acid-immobilized-amine-modified polyacrylamide/bentonite composite (HA-Am-PAA-B) for the adsorption of Cu(II), Zn(II) and Co(II) ions from aqueous solutions. The FTIR and XRD analyses were done to characterize the adsorbent material. The effects of pH, contact time, initial adsorbate concentration, ionic strength and adsorbent dose on adsorption of metal ions were investigated using batch adsorption experiments. The optimum pH for Cu(II), Zn(II) and Co(II) adsorption was observed at 5.0, 9.0 and 8.0, respectively. The mechanism for the removal of metal ions by HA-Am-PAA-B was based on ion exchange and complexation reactions. Metal removal by HA-Am-PAA-B followed a pseudo-second-order kinetics and equilibrium was achieved within 120 min. The suitability of Langmuir, Freundlich and Dubinin-Radushkevich adsorption models to the equilibrium data was investigated. The adsorption was well described by the Langmuir isotherm model. The maximum monolayer adsorption capacity was 106.2, 96.1 and 52.9 mg g−1 for Cu(II), Zn(II) and Co(II) ions, respectively, at 30 °C. The efficiency of HA-Am-PAA-B in removing metal ions from different industry wastewaters was tested. Adsorbed metal ions were desorbed effectively (97.7 for Cu(II), 98.5 for Zn(II) and 99.2% for Co(II)) by 0.1 M HCl. The reusability of the HA-Am-PAA-B for several cycles was also demonstrated.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-7&_user=6 [...] [article] Heavy metals uptake from aqueous solutions and industrial wastewaters by humic acid-immobilized polymer/bentonite composite : kinetics and equilibrium modeling [texte imprimé] / T. S. Anirudhan, Auteur ; P.S. Suchithra, Auteur . - 2010 . - pp. 146-156.
Génie Chimique-
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 146-156
Mots-clés : Humic acid Polymer/clay composite Heavy metal ion Adsorption Wastewater Regeneration Index. décimale : 660 Résumé : This study explored the feasibility of utilizing a novel adsorbent, humic acid-immobilized-amine-modified polyacrylamide/bentonite composite (HA-Am-PAA-B) for the adsorption of Cu(II), Zn(II) and Co(II) ions from aqueous solutions. The FTIR and XRD analyses were done to characterize the adsorbent material. The effects of pH, contact time, initial adsorbate concentration, ionic strength and adsorbent dose on adsorption of metal ions were investigated using batch adsorption experiments. The optimum pH for Cu(II), Zn(II) and Co(II) adsorption was observed at 5.0, 9.0 and 8.0, respectively. The mechanism for the removal of metal ions by HA-Am-PAA-B was based on ion exchange and complexation reactions. Metal removal by HA-Am-PAA-B followed a pseudo-second-order kinetics and equilibrium was achieved within 120 min. The suitability of Langmuir, Freundlich and Dubinin-Radushkevich adsorption models to the equilibrium data was investigated. The adsorption was well described by the Langmuir isotherm model. The maximum monolayer adsorption capacity was 106.2, 96.1 and 52.9 mg g−1 for Cu(II), Zn(II) and Co(II) ions, respectively, at 30 °C. The efficiency of HA-Am-PAA-B in removing metal ions from different industry wastewaters was tested. Adsorbed metal ions were desorbed effectively (97.7 for Cu(II), 98.5 for Zn(II) and 99.2% for Co(II)) by 0.1 M HCl. The reusability of the HA-Am-PAA-B for several cycles was also demonstrated.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-7&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 157-164
Titre : Mathematical model : retention of beryllium on flow-through fixed bed reactor of Amb-IR-120 Type de document : texte imprimé Auteurs : Sameh H. Othman, Auteur ; Mahmoud M. Saleh, Auteur ; M. Demerdash, Auteur Année de publication : 2010 Article en page(s) : pp. 157-164 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Adsorption Modeling Amb-IR-120 Fixed-bed Index. décimale : 660 Résumé : A mathematical model was proposed to simulate the beryllium uptake within a fixed porous flow-through reactor. The effects of various structural, kinetic and hydraulic parameters on the behavior of the flow reactor were studied. These include linear velocity of the fluid, packing density, void fraction and adsorption coefficient. The proposed mathematical model is solved analytically and its predictions were compared with experimental results. A reasonable agreement between model predictions and experimental data was obtained. The model is approved to simulate the behavior of beryllium uptake along the fixed bed reactor of Amb-IR-120 and can be easily applied to similar systems.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X85FFY-1&_user=6 [...] [article] Mathematical model : retention of beryllium on flow-through fixed bed reactor of Amb-IR-120 [texte imprimé] / Sameh H. Othman, Auteur ; Mahmoud M. Saleh, Auteur ; M. Demerdash, Auteur . - 2010 . - pp. 157-164.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 157-164
Mots-clés : Adsorption Modeling Amb-IR-120 Fixed-bed Index. décimale : 660 Résumé : A mathematical model was proposed to simulate the beryllium uptake within a fixed porous flow-through reactor. The effects of various structural, kinetic and hydraulic parameters on the behavior of the flow reactor were studied. These include linear velocity of the fluid, packing density, void fraction and adsorption coefficient. The proposed mathematical model is solved analytically and its predictions were compared with experimental results. A reasonable agreement between model predictions and experimental data was obtained. The model is approved to simulate the behavior of beryllium uptake along the fixed bed reactor of Amb-IR-120 and can be easily applied to similar systems.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X85FFY-1&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 165-169
Titre : Optimization of a hydrodynamic cavitation reactor using salicylic acid dosimetry Type de document : texte imprimé Auteurs : Lekhraj P. Amin, Auteur ; Parag R. Gogate, Auteur ; Arthur E. Burgess, Auteur Année de publication : 2010 Article en page(s) : pp. 165-169 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Hydrodynamic cavitation Salicylic acid dosimetry Hydroxyl radicals Ultrasonic cavitation Optimization Index. décimale : 660 Résumé : In the present work, optimization of a hydrodynamic cavitation reactor, for maximizing the extent of hydroxyl radical generation, has been investigated using salicylic acid as a dosimeter. The effect of different operating parameters such as inlet pressure into the reactor, shape of the orifice, and concentration of salicylic acid employed was investigated where the extent of hydroxyl radical generation was quantified in terms of concentration of the hydroxylated products 2,5- and 2,3-dihydroxybenzoic acid. With an upstream pressure of <100 psi no hydroxyl radicals were produced but excellent results were obtained with a small circular nozzle at 4000 psi and a salicylate concentration of 750 ppm. The use of a combination of ultrasound along with hydrodynamic cavitation is also reported for the first time and results in a 15% improvement in the hydroxyl radical generation when the distance between the orifice and transducer is 5–10 mm.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XDCHT4-2&_user=6 [...] [article] Optimization of a hydrodynamic cavitation reactor using salicylic acid dosimetry [texte imprimé] / Lekhraj P. Amin, Auteur ; Parag R. Gogate, Auteur ; Arthur E. Burgess, Auteur . - 2010 . - pp. 165-169.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 165-169
Mots-clés : Hydrodynamic cavitation Salicylic acid dosimetry Hydroxyl radicals Ultrasonic cavitation Optimization Index. décimale : 660 Résumé : In the present work, optimization of a hydrodynamic cavitation reactor, for maximizing the extent of hydroxyl radical generation, has been investigated using salicylic acid as a dosimeter. The effect of different operating parameters such as inlet pressure into the reactor, shape of the orifice, and concentration of salicylic acid employed was investigated where the extent of hydroxyl radical generation was quantified in terms of concentration of the hydroxylated products 2,5- and 2,3-dihydroxybenzoic acid. With an upstream pressure of <100 psi no hydroxyl radicals were produced but excellent results were obtained with a small circular nozzle at 4000 psi and a salicylate concentration of 750 ppm. The use of a combination of ultrasound along with hydrodynamic cavitation is also reported for the first time and results in a 15% improvement in the hydroxyl radical generation when the distance between the orifice and transducer is 5–10 mm.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XDCHT4-2&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 170-176
Titre : Characterization of nanofibrous carbon produced at pilot-scale in a fluidized bed reactor by methane decomposition Type de document : texte imprimé Auteurs : J.L. Pinilla, Auteur ; M.J. Lazaro, Auteur ; I. Suelves, Auteur Année de publication : 2010 Article en page(s) : pp. 170-176 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Fluidized bed reactor Carbon nanofiber Hydrogen production Methane catalytic decomposition Index. décimale : 660 Résumé : Carbon nanofibers (CNFs) production in the range of hundreds of grams per day has been achieved in a fluidized bed reactor (FBR) by methane decomposition using a nickel based catalyst. The characterization of the carbon produced at different operating conditions (temperature, space velocity and the ratio of gas flow velocity, uo, to the minimum fluidization velocity, umf) has been accomplished by means of X-ray diffraction (XRD), N2 adsorption, temperature-programmed oxidation (TPO), scanning electron microscope (SEM) and transmission electron microscopy (TEM). It has been concluded that the structural and textural properties of the CNFs obtained in the FBR are analogous to the ones obtained in a fixed bed reactor at a production scale two orders of magnitude lower. Thus, FBR can be envisaged as a promising reaction configuration for the catalytic decomposition of methane (CDM), allowing the production of high quantities of CNFs with desirable structural and textural properties.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XH0MVY-5&_user=6 [...] [article] Characterization of nanofibrous carbon produced at pilot-scale in a fluidized bed reactor by methane decomposition [texte imprimé] / J.L. Pinilla, Auteur ; M.J. Lazaro, Auteur ; I. Suelves, Auteur . - 2010 . - pp. 170-176.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 170-176
Mots-clés : Fluidized bed reactor Carbon nanofiber Hydrogen production Methane catalytic decomposition Index. décimale : 660 Résumé : Carbon nanofibers (CNFs) production in the range of hundreds of grams per day has been achieved in a fluidized bed reactor (FBR) by methane decomposition using a nickel based catalyst. The characterization of the carbon produced at different operating conditions (temperature, space velocity and the ratio of gas flow velocity, uo, to the minimum fluidization velocity, umf) has been accomplished by means of X-ray diffraction (XRD), N2 adsorption, temperature-programmed oxidation (TPO), scanning electron microscope (SEM) and transmission electron microscopy (TEM). It has been concluded that the structural and textural properties of the CNFs obtained in the FBR are analogous to the ones obtained in a fixed bed reactor at a production scale two orders of magnitude lower. Thus, FBR can be envisaged as a promising reaction configuration for the catalytic decomposition of methane (CDM), allowing the production of high quantities of CNFs with desirable structural and textural properties.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XH0MVY-5&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 177-183
Titre : New approach for simultaneous enhancement of anticorrosive and mechanical properties of coatings : application of water repellent nano CaCO3–PANI emulsion nanocomposite in alkyd resin Type de document : texte imprimé Auteurs : B. A. Bhanvase, Auteur ; S.H. Sonawane, Auteur Année de publication : 2010 Article en page(s) : pp. 177-183 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Functional nano CaCO3 Nanocomposites Anticorrosive alkyd coatings Mechanical properties Index. décimale : 660 Résumé : New alkyd coatings were prepared by addition of water-based polyaniline–4% CaCO3 (PAC) nanocomposites into alkyd resin. Pure polyaniline (PANI) and PAC were synthesized using ultrasound assisted emulsion polymerization and added to alkyd resin to form nanocomposite coating. Nano CaCO3 was added in different percentage ranging from 0% to 8% of monomer during the synthesis of polyaniline. XRD and TEM reveals that water repellent nano CaCO3 is thoroughly dispersed in PANI matrix. The effect of PANI and PAC nanocomposite on mechanical and anticorrosion performance of alkyd coating was evaluated. An electrochemical measurement (Tafel Plots) shows that corrosion current Icorr was decreased from 0.89 to 0.03 μA/cm2, when PAC nanocomposite was added to neat coatings. Positive shift of Ecorr. also indicates that PAC nanocomposite acts as an anticorrosive additive to alkyd coating. Presence of water repellant nano CaCO3 in PAC nanocomposite has exhibited dual effect, such as improvement in mechanical and anticorrosion properties. The experimental results have shown superiority of PAC nanocomposite over PANI when PAC nanocomposite added to alkyd coatings.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFPR6F-2&_user=6 [...] [article] New approach for simultaneous enhancement of anticorrosive and mechanical properties of coatings : application of water repellent nano CaCO3–PANI emulsion nanocomposite in alkyd resin [texte imprimé] / B. A. Bhanvase, Auteur ; S.H. Sonawane, Auteur . - 2010 . - pp. 177-183.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 177-183
Mots-clés : Functional nano CaCO3 Nanocomposites Anticorrosive alkyd coatings Mechanical properties Index. décimale : 660 Résumé : New alkyd coatings were prepared by addition of water-based polyaniline–4% CaCO3 (PAC) nanocomposites into alkyd resin. Pure polyaniline (PANI) and PAC were synthesized using ultrasound assisted emulsion polymerization and added to alkyd resin to form nanocomposite coating. Nano CaCO3 was added in different percentage ranging from 0% to 8% of monomer during the synthesis of polyaniline. XRD and TEM reveals that water repellent nano CaCO3 is thoroughly dispersed in PANI matrix. The effect of PANI and PAC nanocomposite on mechanical and anticorrosion performance of alkyd coating was evaluated. An electrochemical measurement (Tafel Plots) shows that corrosion current Icorr was decreased from 0.89 to 0.03 μA/cm2, when PAC nanocomposite was added to neat coatings. Positive shift of Ecorr. also indicates that PAC nanocomposite acts as an anticorrosive additive to alkyd coating. Presence of water repellant nano CaCO3 in PAC nanocomposite has exhibited dual effect, such as improvement in mechanical and anticorrosion properties. The experimental results have shown superiority of PAC nanocomposite over PANI when PAC nanocomposite added to alkyd coatings.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFPR6F-2&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 184-192
Titre : Pores occlusion in MCM-41 spheres immersed in SBF and the effect on ibuprofen delivery kinetics : a quantitative model Type de document : texte imprimé Auteurs : Renato Mortera, Auteur ; Sonia Fiorilli, Auteur ; Edoardo Garrone, Auteur Année de publication : 2010 Article en page(s) : pp. 184-192 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Ordered mesoporous silica Drug delivery MCM-41 spheres Release kinetics Index. décimale : 660 Résumé : MCM-41 silica particles have been synthesized with size in the low submicron range, loaded with ibuprofen and characterized by means of XRD, N2 adsorption and scanning electron microscopy, coupled with EDS analysis both before and after contact with different volumes of simulated body fluid (SBF) at 37 °C up to 10 h.
The particles do not show any change in morphology, composition and mesostructure as a consequence of soaking. MCM-41 spheres, though, are not inert towards SBF. Two processes take place, showing features independent from the soaking volume: (i) one within 1–2 h, bringing about dissolution of silica into the liquid phase up to a concentration of 2.2 mM and no change in the mesopore volume; (ii) the second, after an induction period of 1–2 h, bringing about a limited increase in the concentration of dissolved silica, but affecting severely the mesoporous volume, which decreases exponentially with time.
Delivery curves differ significantly when varying the volume of SBF used. To account for release kinetics under the circumstances observed, a mathematical model is proposed, based on the standard Noyes–Whitney equation, taking into account both the SBF volume used and the mesopores occlusion, this latter through a time-dependent diffusion coefficient. A satisfactory agreement is observed, without the intervention of any adjustable parameter.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-4&_user=6 [...] [article] Pores occlusion in MCM-41 spheres immersed in SBF and the effect on ibuprofen delivery kinetics : a quantitative model [texte imprimé] / Renato Mortera, Auteur ; Sonia Fiorilli, Auteur ; Edoardo Garrone, Auteur . - 2010 . - pp. 184-192.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 184-192
Mots-clés : Ordered mesoporous silica Drug delivery MCM-41 spheres Release kinetics Index. décimale : 660 Résumé : MCM-41 silica particles have been synthesized with size in the low submicron range, loaded with ibuprofen and characterized by means of XRD, N2 adsorption and scanning electron microscopy, coupled with EDS analysis both before and after contact with different volumes of simulated body fluid (SBF) at 37 °C up to 10 h.
The particles do not show any change in morphology, composition and mesostructure as a consequence of soaking. MCM-41 spheres, though, are not inert towards SBF. Two processes take place, showing features independent from the soaking volume: (i) one within 1–2 h, bringing about dissolution of silica into the liquid phase up to a concentration of 2.2 mM and no change in the mesopore volume; (ii) the second, after an induction period of 1–2 h, bringing about a limited increase in the concentration of dissolved silica, but affecting severely the mesoporous volume, which decreases exponentially with time.
Delivery curves differ significantly when varying the volume of SBF used. To account for release kinetics under the circumstances observed, a mathematical model is proposed, based on the standard Noyes–Whitney equation, taking into account both the SBF volume used and the mesopores occlusion, this latter through a time-dependent diffusion coefficient. A satisfactory agreement is observed, without the intervention of any adjustable parameter.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-4&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 193-199
Titre : Radiation-induced admicellar polymerization of isoprene on silica : effects of surfactant's chain length Type de document : texte imprimé Auteurs : Narissara Yooprasert, Auteur ; Thirawudh Pongprayoon, Auteur ; Phiriyatorn Suwanmala, Auteur Année de publication : 2010 Article en page(s) : pp. 193-199 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Modified silica Polyisoprene Admicellar polymerization Gamma radiation Index. décimale : 660 Résumé : This research compared radiation-induced admicellar polymerization with the traditional thermal process and studied the influence of the hydrocarbon chain length of different surfactants on film formation. Three types of surfactants were used in this study: dodecyl trimethyl ammonium bromide (DTAB), tetradecyl trimethyl ammonium bromide (TTAB) and cetyl trimethyl ammonium bromide (CTAB). Isoprene was used as a monomer for the formation of thin film inside the surfactant bilayers, called admicelle, adsorbed on silica surface. The results showed that an optimum dose can lead to a better film formation on silica, compared with the thermal method. However, when the dose was over the optimum value, the formation of polyisoprene film was diminished. The formation of polyisoprene film was found to depend not only on the hydrocarbon chain length of the surfactant, but also on the density of adsorbed surfactant on silica surface.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-5&_user=6 [...] [article] Radiation-induced admicellar polymerization of isoprene on silica : effects of surfactant's chain length [texte imprimé] / Narissara Yooprasert, Auteur ; Thirawudh Pongprayoon, Auteur ; Phiriyatorn Suwanmala, Auteur . - 2010 . - pp. 193-199.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 193-199
Mots-clés : Modified silica Polyisoprene Admicellar polymerization Gamma radiation Index. décimale : 660 Résumé : This research compared radiation-induced admicellar polymerization with the traditional thermal process and studied the influence of the hydrocarbon chain length of different surfactants on film formation. Three types of surfactants were used in this study: dodecyl trimethyl ammonium bromide (DTAB), tetradecyl trimethyl ammonium bromide (TTAB) and cetyl trimethyl ammonium bromide (CTAB). Isoprene was used as a monomer for the formation of thin film inside the surfactant bilayers, called admicelle, adsorbed on silica surface. The results showed that an optimum dose can lead to a better film formation on silica, compared with the thermal method. However, when the dose was over the optimum value, the formation of polyisoprene film was diminished. The formation of polyisoprene film was found to depend not only on the hydrocarbon chain length of the surfactant, but also on the density of adsorbed surfactant on silica surface.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-5&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 200-205
Titre : Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process Type de document : texte imprimé Auteurs : Nobuhiro Hagura, Auteur ; W. Widiyastuti, Auteur ; Ferry Iskandar, Auteur Année de publication : 2010 Article en page(s) : pp. 200-205 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Silica coating Microemulsion Hydrolysis reaction rate Surface plasmon resonance (SPR) Index. décimale : 660 Résumé : Described herein is the synthesis of individually silica-coated silver nanoparticles using a reverse micelle method followed by hydrolysis and condensation of tetraethoxysilane (TEOS). The size of a silica-coated silver nanoparticle can be controlled by changing the reaction time and the concentration of TEOS. By maintaining the size of a silver nanoparticle as a core particle at around 7 nm, the size of a silica-coated silver nanoparticle increased from 13 to 28 nm as the reaction time increased from 1 to 9 h due to an increase in silica thickness. The size of silica-coated silver nanoparticles also increased from 15 to 22 nm as the TEOS concentration increased from 7.8 to 40 mM. The size of a silica-coated silver nanoparticle can be accurately predicted using the rate of the hydrolysis reaction for TEOS. Neither the dispersion nor the film of silica-coated silver nanoparticles exhibited any peak shifting during surface plasmon resonance (SPR) at around 410 nm, whereas, without silica coating, the SPR peak of Ag film shifted to 466 nm.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-2&_user=6 [...] [article] Characterization of silica-coated silver nanoparticles prepared by a reverse micelle and hydrolysis–condensation process [texte imprimé] / Nobuhiro Hagura, Auteur ; W. Widiyastuti, Auteur ; Ferry Iskandar, Auteur . - 2010 . - pp. 200-205.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 200-205
Mots-clés : Silica coating Microemulsion Hydrolysis reaction rate Surface plasmon resonance (SPR) Index. décimale : 660 Résumé : Described herein is the synthesis of individually silica-coated silver nanoparticles using a reverse micelle method followed by hydrolysis and condensation of tetraethoxysilane (TEOS). The size of a silica-coated silver nanoparticle can be controlled by changing the reaction time and the concentration of TEOS. By maintaining the size of a silver nanoparticle as a core particle at around 7 nm, the size of a silica-coated silver nanoparticle increased from 13 to 28 nm as the reaction time increased from 1 to 9 h due to an increase in silica thickness. The size of silica-coated silver nanoparticles also increased from 15 to 22 nm as the TEOS concentration increased from 7.8 to 40 mM. The size of a silica-coated silver nanoparticle can be accurately predicted using the rate of the hydrolysis reaction for TEOS. Neither the dispersion nor the film of silica-coated silver nanoparticles exhibited any peak shifting during surface plasmon resonance (SPR) at around 410 nm, whereas, without silica coating, the SPR peak of Ag film shifted to 466 nm.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XFY0NY-2&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 206-214
Titre : The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels Type de document : texte imprimé Auteurs : Vesna Panic, Auteur ; Borivoj Adnadjevic, Auteur ; Sava Velickovic, Auteur Année de publication : 2010 Article en page(s) : pp. 206-214 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Poly (methacrylic acid) hydrogel Structural properties Swelling kinetics Index. décimale : 660 Résumé : Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (ρxg), the number average molar mass between the network crosslinks (Mc), the crosslink degree (ρc), the number of elastically effective chains totally induced in a perfect network per unit volume (Ve), the distance between the macromolecular chains (ξ) and the equilibrium swelling degree (SDeq) and the swelling kinetics was investigated. As the concentrations of crosslinker, monomer and initiator increase, the value of ρxg, ρc and Ve increases and decreases the value of Mc, ξ and SDeq. With the increase in the neutralization degree of methacrylic acid, the values of ρxg, Mc, ξ, SDeq increase, while the ρc and Ve decrease. The xerogels structural properties, SDeq and swelling kinetic parameters are mainly in power law form functional relationships with the synthesis parameters as well as with the xerogels crosslinking degree.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-7&_user=6 [...] [article] The effects of the synthesis parameters on the xerogels structures and on the swelling parameters of the poly(methacrylic acid) hydrogels [texte imprimé] / Vesna Panic, Auteur ; Borivoj Adnadjevic, Auteur ; Sava Velickovic, Auteur . - 2010 . - pp. 206-214.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 206-214
Mots-clés : Poly (methacrylic acid) hydrogel Structural properties Swelling kinetics Index. décimale : 660 Résumé : Poly(methacrylic acid) hydrogels were synthesized. The effects of the synthesis parameters: the neutralization degree of methacrylic acid and the concentrations of monomer, crosslinker and initiator on the xerogels structural properties: the xerogel density (ρxg), the number average molar mass between the network crosslinks (Mc), the crosslink degree (ρc), the number of elastically effective chains totally induced in a perfect network per unit volume (Ve), the distance between the macromolecular chains (ξ) and the equilibrium swelling degree (SDeq) and the swelling kinetics was investigated. As the concentrations of crosslinker, monomer and initiator increase, the value of ρxg, ρc and Ve increases and decreases the value of Mc, ξ and SDeq. With the increase in the neutralization degree of methacrylic acid, the values of ρxg, Mc, ξ, SDeq increase, while the ρc and Ve decrease. The xerogels structural properties, SDeq and swelling kinetic parameters are mainly in power law form functional relationships with the synthesis parameters as well as with the xerogels crosslinking degree.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-7&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 215-225
Titre : Computational fluid dynamic modeling of a chemical vapor synthesis process for aluminum nanopowder as a hydrogen storage precursor Type de document : texte imprimé Auteurs : H.Y. Sohn, Auteur ; Silvia Perez-Fontesa, Auteur ; Jin Won Choi, Auteur Année de publication : 2010 Article en page(s) : pp. 215-225 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Computational fluid dynamics modeling Chemical vapor synthesis Nucleation and growth Aluminum Nanopowder Hydrogen storage Index. décimale : 660 Résumé : A chemical vapor synthesis (CVS) process for synthesizing nano-sized aluminum powder as a precursor for various hydrogen storage materials was simulated by the use of computational fluid dynamic modeling. The fluid flow, heat transfer and chemical reaction phenomena taking place inside the reactor were analyzed together with particle formation and growth in the CVS process. The temperature, velocity and particle size distribution fields inside the reactor were computed. Chemical reaction rate and population balance model were used to calculate the particle formation and growth. The particle size computed by the program was compared with the experimental data, and the calculated average size of the final product particles was consistent with those obtained in the experimental work.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-5&_user=6 [...] [article] Computational fluid dynamic modeling of a chemical vapor synthesis process for aluminum nanopowder as a hydrogen storage precursor [texte imprimé] / H.Y. Sohn, Auteur ; Silvia Perez-Fontesa, Auteur ; Jin Won Choi, Auteur . - 2010 . - pp. 215-225.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 215-225
Mots-clés : Computational fluid dynamics modeling Chemical vapor synthesis Nucleation and growth Aluminum Nanopowder Hydrogen storage Index. décimale : 660 Résumé : A chemical vapor synthesis (CVS) process for synthesizing nano-sized aluminum powder as a precursor for various hydrogen storage materials was simulated by the use of computational fluid dynamic modeling. The fluid flow, heat transfer and chemical reaction phenomena taking place inside the reactor were analyzed together with particle formation and growth in the CVS process. The temperature, velocity and particle size distribution fields inside the reactor were computed. Chemical reaction rate and population balance model were used to calculate the particle formation and growth. The particle size computed by the program was compared with the experimental data, and the calculated average size of the final product particles was consistent with those obtained in the experimental work.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-5&_user=6 [...]
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 226-233
Titre : Effects of mixing, seeding, material of baffles and final temperature on solution crystallization of l-glutamic acid in an oscillatory baffled crystallizer Type de document : texte imprimé Auteurs : Xiongwei Ni, Auteur ; Anting Liao, Auteur Année de publication : 2010 Article en page(s) : pp. 226-233 Note générale : Génie Chimique
Langues : Anglais (eng) Mots-clés : Solution crystallization Linear cooling rate Seeding Oscillatory baffled crystallizer Meta-stable zone width l-Glutamic acid Index. décimale : 660 Résumé : In this paper, we report the effects of mixing intensity, seeding, composition of baffle material and final temperature on meta-stable zone width (MSZW) and crystal polymorph in solution crystallization of an industrially important compound, l-glutamic acid, in an oscillatory baffled crystallizer (OBC). The results show that the MSZW decreases with increasing of mixing; meta-stable α crystals are transformed into stable β crystals with enhanced mixing intensity. Seeding meta-stable α crystals in operational conditions that promote β crystals leads to the formation of α crystals allowing co-existence of both forms; while seeding stable β crystals in conditions that favour α form allow β crystals prevailing in all conditions. Smoother surface of baffle material in OBC exhibits larger MSZW and favours meta-stable crystals, while rougher surface has smaller MSZW with stable crystals dominating. The meta-stable crystals gradually change into the stable form when final cooling temperature is closer to its nucleation temperature. The outcomes from this work indicate that by controlling process parameters desirable crystal polymorph can be obtained in the OBC.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-6&_user=6 [...] [article] Effects of mixing, seeding, material of baffles and final temperature on solution crystallization of l-glutamic acid in an oscillatory baffled crystallizer [texte imprimé] / Xiongwei Ni, Auteur ; Anting Liao, Auteur . - 2010 . - pp. 226-233.
Génie Chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 156 N° 1 (Janvier 2010) . - pp. 226-233
Mots-clés : Solution crystallization Linear cooling rate Seeding Oscillatory baffled crystallizer Meta-stable zone width l-Glutamic acid Index. décimale : 660 Résumé : In this paper, we report the effects of mixing intensity, seeding, composition of baffle material and final temperature on meta-stable zone width (MSZW) and crystal polymorph in solution crystallization of an industrially important compound, l-glutamic acid, in an oscillatory baffled crystallizer (OBC). The results show that the MSZW decreases with increasing of mixing; meta-stable α crystals are transformed into stable β crystals with enhanced mixing intensity. Seeding meta-stable α crystals in operational conditions that promote β crystals leads to the formation of α crystals allowing co-existence of both forms; while seeding stable β crystals in conditions that favour α form allow β crystals prevailing in all conditions. Smoother surface of baffle material in OBC exhibits larger MSZW and favours meta-stable crystals, while rougher surface has smaller MSZW with stable crystals dominating. The meta-stable crystals gradually change into the stable form when final cooling temperature is closer to its nucleation temperature. The outcomes from this work indicate that by controlling process parameters desirable crystal polymorph can be obtained in the OBC.
DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4XHVH7T-6&_user=6 [...]
Exemplaires
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| aucun exemplaire | |||||
