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Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution / Mehmet Riza Altiokka in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12379–12382 Titre : Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution Type de document : texte imprimé Auteurs : Mehmet Riza Altiokka, Auteur ; Handan Akalin, Auteur ; Nergis Melek, Auteur Année de publication : 2011 Article en page(s) : pp. 12379–12382 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : kinetics Résumé : Kaolin with a given size distribution was calcined at 1023 K for 2 h then digested in 3.0, 4.5, and 6.0 N sulfuric acid at constant temperatures within the range 328−358 K. The samples taken from the solution at predetermined time intervals were analyzed by using a complexometric method and the amount of aluminum passed into the solution was determined. The results showed that the dissolution kinetics follow the shrinking core model for spherical particles of unchanging size, t/τ = 1 − (1 − xB)1/3, with the apparent activation energy of 98.4 kJ/mol. The leaching reaction was found to be the 0.75th order with respect to acid concentration and controlled by reaction step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101147n [article] Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution [texte imprimé] / Mehmet Riza Altiokka, Auteur ; Handan Akalin, Auteur ; Nergis Melek, Auteur . - 2011 . - pp. 12379–12382. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12379–12382 Mots-clés : kinetics Résumé : Kaolin with a given size distribution was calcined at 1023 K for 2 h then digested in 3.0, 4.5, and 6.0 N sulfuric acid at constant temperatures within the range 328−358 K. The samples taken from the solution at predetermined time intervals were analyzed by using a complexometric method and the amount of aluminum passed into the solution was determined. The results showed that the dissolution kinetics follow the shrinking core model for spherical particles of unchanging size, t/τ = 1 − (1 − xB)1/3, with the apparent activation energy of 98.4 kJ/mol. The leaching reaction was found to be the 0.75th order with respect to acid concentration and controlled by reaction step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101147n

Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst / Mehmet Riza Altiokka in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10840–10844 Titre : Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst Type de document : texte imprimé Auteurs : Mehmet Riza Altiokka, Auteur ; Sema Akyalçin, Auteur Année de publication : 2010 Article en page(s) : pp. 10840–10844 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Kinetics--Hydration--Ethylene--Oxide--Presence--Heterogeneous--Catalyst Résumé : Kinetic data on the hydration of ethylene oxide was obtained from both uncatalyzed and heterogeneously catalyzed reactions using a pressurized batch reactor. Amberjet 4200/HCO3− was used as the heterogeneous catalyst, which was found to be the most effective among the four types of cross-linked styrene−divinylbenzene anion-exchange resins tested. The reactions were proved to follow a series-parallel irreversible homogeneous mechanism under both catalyzed and uncatalyzed conditions. Thus the corresponding rate expression can be given as −rEtO = k1CWCEtO + k2CMEGCEtO + k3CDEGCEtO. The rate constants were determined by applying the method of averages at different temperatures. The temperature dependency of the rate constants was found to be k1/[L/(mol·min)] = exp(13.62 − 8220/T), k2/[L/(mol·min)] = exp(15.57 − 8700/T), and k3/[L/(mol·min)] = exp(16.06 − 8900/T) for the uncatalyzed reactions and k1/[L/(mol·min)] = exp(19.60 − 9580/T), k2/[L/(mol·min)] = exp(20.19 − 10171/T), and k3/[L/(mol·min)] = exp(19.06 − 9743/T) in the presence of catalyst of 0.15 mol of HCO3−/L in equivalent, where T is the absolute temperature in kelvin. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901037w [article] Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst [texte imprimé] / Mehmet Riza Altiokka, Auteur ; Sema Akyalçin, Auteur . - 2010 . - pp. 10840–10844. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10840–10844 Mots-clés : Kinetics--Hydration--Ethylene--Oxide--Presence--Heterogeneous--Catalyst Résumé : Kinetic data on the hydration of ethylene oxide was obtained from both uncatalyzed and heterogeneously catalyzed reactions using a pressurized batch reactor. Amberjet 4200/HCO3− was used as the heterogeneous catalyst, which was found to be the most effective among the four types of cross-linked styrene−divinylbenzene anion-exchange resins tested. The reactions were proved to follow a series-parallel irreversible homogeneous mechanism under both catalyzed and uncatalyzed conditions. Thus the corresponding rate expression can be given as −rEtO = k1CWCEtO + k2CMEGCEtO + k3CDEGCEtO. The rate constants were determined by applying the method of averages at different temperatures. The temperature dependency of the rate constants was found to be k1/[L/(mol·min)] = exp(13.62 − 8220/T), k2/[L/(mol·min)] = exp(15.57 − 8700/T), and k3/[L/(mol·min)] = exp(16.06 − 8900/T) for the uncatalyzed reactions and k1/[L/(mol·min)] = exp(19.60 − 9580/T), k2/[L/(mol·min)] = exp(20.19 − 10171/T), and k3/[L/(mol·min)] = exp(19.06 − 9743/T) in the presence of catalyst of 0.15 mol of HCO3−/L in equivalent, where T is the absolute temperature in kelvin. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901037w

Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst / Mehmet Riza Altiokka in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10840–10844 Titre : Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst Type de document : texte imprimé Auteurs : Mehmet Riza Altiokka, Auteur ; Sema Akyalçin, Auteur Année de publication : 2010 Article en page(s) : pp. 10840–10844 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ethylene  oxideKinetic  data  Pressurized  batch  reactor Résumé : Kinetic data on the hydration of ethylene oxide was obtained from both uncatalyzed and heterogeneously catalyzed reactions using a pressurized batch reactor. Amberjet 4200/HCO3− was used as the heterogeneous catalyst, which was found to be the most effective among the four types of cross-linked styrene−divinylbenzene anion-exchange resins tested. The reactions were proved to follow a series-parallel irreversible homogeneous mechanism under both catalyzed and uncatalyzed conditions. Thus the corresponding rate expression can be given as −rEtO = k1CWCEtO + k2CMEGCEtO + k3CDEGCEtO. The rate constants were determined by applying the method of averages at different temperatures. The temperature dependency of the rate constants was found to be k1/[L/(mol·min)] = exp(13.62 − 8220/T), k2/[L/(mol·min)] = exp(15.57 − 8700/T), and k3/[L/(mol·min)] = exp(16.06 − 8900/T) for the uncatalyzed reactions and k1/[L/(mol·min)] = exp(19.60 − 9580/T), k2/[L/(mol·min)] = exp(20.19 − 10171/T), and k3/[L/(mol·min)] = exp(19.06 − 9743/T) in the presence of catalyst of 0.15 mol of HCO3−/L in equivalent, where T is the absolute temperature in kelvin. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901037w [article] Kinetics of the hydration of ethylene oxide in the presence of heterogeneous catalyst [texte imprimé] / Mehmet Riza Altiokka, Auteur ; Sema Akyalçin, Auteur . - 2010 . - pp. 10840–10844. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10840–10844 Mots-clés : Ethylene  oxideKinetic  data  Pressurized  batch  reactor Résumé : Kinetic data on the hydration of ethylene oxide was obtained from both uncatalyzed and heterogeneously catalyzed reactions using a pressurized batch reactor. Amberjet 4200/HCO3− was used as the heterogeneous catalyst, which was found to be the most effective among the four types of cross-linked styrene−divinylbenzene anion-exchange resins tested. The reactions were proved to follow a series-parallel irreversible homogeneous mechanism under both catalyzed and uncatalyzed conditions. Thus the corresponding rate expression can be given as −rEtO = k1CWCEtO + k2CMEGCEtO + k3CDEGCEtO. The rate constants were determined by applying the method of averages at different temperatures. The temperature dependency of the rate constants was found to be k1/[L/(mol·min)] = exp(13.62 − 8220/T), k2/[L/(mol·min)] = exp(15.57 − 8700/T), and k3/[L/(mol·min)] = exp(16.06 − 8900/T) for the uncatalyzed reactions and k1/[L/(mol·min)] = exp(19.60 − 9580/T), k2/[L/(mol·min)] = exp(20.19 − 10171/T), and k3/[L/(mol·min)] = exp(19.06 − 9743/T) in the presence of catalyst of 0.15 mol of HCO3−/L in equivalent, where T is the absolute temperature in kelvin. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901037w