Documents disponibles écrits par cet auteur

Etherification of glycerol by tert - butyl alcohol / M. Pilar Pico in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9500–9509 Titre : Etherification of glycerol by tert - butyl alcohol : Kinetic model Type de document : texte imprimé Auteurs : M. Pilar Pico, Auteur ; Arturo Romero, Auteur ; Sergio Rodriguez, Auteur Année de publication : 2012 Article en page(s) : pp. 9500–9509 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Kinetic Résumé : The catalytic etherification of glycerol with tert-butyl alcohol over a strong acid ion-exchange commercial resin (Amberlyst 15) has been studied. The etherification reactions were carried out in a glass laboratory autoclave reactor with magnetic stirring without solvent at autogenous pressure. Experimental results were obtained at different temperatures (50–80 °C) and using an 8.5 wt % catalyst loading referred to the starting amount of glycerol. Four ethers (two monoethers and two diethers) and isobutylene were identified as the main products of glycerol etherification and tert-butyl alcohol dehydration (secondary reaction), respectively. Two simplified heterogeneus kinetic models are proposed to describe the process performance. The first model lumps the monoethers and diethers into the species M and D, respectively, and includes three reactions and the corresponding kinetic equations. The second model includes all of the species detected and six stoichiometric equations. Kinetic parameters for each kinetic model were estimated by data fitting. Irreversible dehydration of tert-butyl alcohol can be assumed at the operating conditions employed in the present study. Both kinetic models proposed describe the evolution of the system properly, in terms of both the reactant and product distributions with reaction time in the temperature range studied. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300481d [article] Etherification of glycerol by tert - butyl alcohol : Kinetic model [texte imprimé] / M. Pilar Pico, Auteur ; Arturo Romero, Auteur ; Sergio Rodriguez, Auteur . - 2012 . - pp. 9500–9509. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9500–9509 Mots-clés : Kinetic Résumé : The catalytic etherification of glycerol with tert-butyl alcohol over a strong acid ion-exchange commercial resin (Amberlyst 15) has been studied. The etherification reactions were carried out in a glass laboratory autoclave reactor with magnetic stirring without solvent at autogenous pressure. Experimental results were obtained at different temperatures (50–80 °C) and using an 8.5 wt % catalyst loading referred to the starting amount of glycerol. Four ethers (two monoethers and two diethers) and isobutylene were identified as the main products of glycerol etherification and tert-butyl alcohol dehydration (secondary reaction), respectively. Two simplified heterogeneus kinetic models are proposed to describe the process performance. The first model lumps the monoethers and diethers into the species M and D, respectively, and includes three reactions and the corresponding kinetic equations. The second model includes all of the species detected and six stoichiometric equations. Kinetic parameters for each kinetic model were estimated by data fitting. Irreversible dehydration of tert-butyl alcohol can be assumed at the operating conditions employed in the present study. Both kinetic models proposed describe the evolution of the system properly, in terms of both the reactant and product distributions with reaction time in the temperature range studied. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300481d

Phenol production kinetic model in the cyclohexanol dehydrogenation process / Arturo Romero in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8498-8504 Titre : Phenol production kinetic model in the cyclohexanol dehydrogenation process Type de document : texte imprimé Auteurs : Arturo Romero, Auteur ; Aurora Santos, Auteur ; Gema Ruiz, Auteur Année de publication : 2011 Article en page(s) : pp. 8498-8504 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Dehydrogenation  Kinetic  model  Production Résumé : A kinetic model of phenol formation in the process of dehydrogenation of cyclohexanol to cyclohexanone has been developed and validated, including variables such as the temperature and the concentration of reactants and products. Catalytic dehydrogenation of cyclohexanol to cyclohexanone in the gas phase was conducted at atmospheric pressure in a continuous flow fixed-bed reactor (T = 220, 250, and 290 °C; W/QL ratios from 102 to 1773 gcat h kg―1). A commercial copper zinc oxide catalyst was employed. The kinetics of phenol formation, the main process impurity, were determined after discrimination of a kinetic model of the dehydrogenation of cyclohexanol to cyclohexanone. Weak adsorption of hydrogen on the copper catalyst was confirmed. Different reaction pathways for phenol formation were studied. The results suggested that phenol is obtained from cyclohexanone. This model was validated by the study of the reaction with pure cyclohexanone. Phenol production predicted by the proposed model fitted quite well with the experimental data. The estimated activation energy of phenol formation was 113.6 kJ/mol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346890 [article] Phenol production kinetic model in the cyclohexanol dehydrogenation process [texte imprimé] / Arturo Romero, Auteur ; Aurora Santos, Auteur ; Gema Ruiz, Auteur . - 2011 . - pp. 8498-8504. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8498-8504 Mots-clés : Modeling  Dehydrogenation  Kinetic  model  Production Résumé : A kinetic model of phenol formation in the process of dehydrogenation of cyclohexanol to cyclohexanone has been developed and validated, including variables such as the temperature and the concentration of reactants and products. Catalytic dehydrogenation of cyclohexanol to cyclohexanone in the gas phase was conducted at atmospheric pressure in a continuous flow fixed-bed reactor (T = 220, 250, and 290 °C; W/QL ratios from 102 to 1773 gcat h kg―1). A commercial copper zinc oxide catalyst was employed. The kinetics of phenol formation, the main process impurity, were determined after discrimination of a kinetic model of the dehydrogenation of cyclohexanol to cyclohexanone. Weak adsorption of hydrogen on the copper catalyst was confirmed. Different reaction pathways for phenol formation were studied. The results suggested that phenol is obtained from cyclohexanone. This model was validated by the study of the reaction with pure cyclohexanone. Phenol production predicted by the proposed model fitted quite well with the experimental data. The estimated activation energy of phenol formation was 113.6 kJ/mol. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346890