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

Fenton pretreatment in the catalytic wet oxidation of phenol / Aurora Santos in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5583–5587 Titre : Fenton pretreatment in the catalytic wet oxidation of phenol Type de document : texte imprimé Auteurs : Aurora Santos, Auteur ; Pedro Yustos, Auteur ; Sergio Rodriguez, Auteur Année de publication : 2010 Article en page(s) : pp. 5583–5587 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Catalytic  wet  oxidation  Phenol  (PhOH)  aqueous  solutions  Continuous  three-phase  reactor  FR  pretreatment Résumé : Catalytic wet oxidation (CWO) of 1000 mg/L of phenol (PhOH) aqueous solutions has been carried out using a commercial activated carbon as catalyst, placed in a continuous three-phase reactor at 16 bar, and temperature was changed in the interval 127−160 °C. Pure oxygen was fed as gaseous phase. Pollutant conversion, mineralization, intermediate distribution, and toxicity were measured at the reactor exit. The catalyst weight (W) to liquid flow rate (QL) ratio was varied from 0.3 to 17.5 gACmin/mL. Fenton reagent (FR) has been applied to the same phenolic aqueous samples using different amounts of H2O2 (between 10 and 100% of the stoichiometric dose) and 10 mg/L of Fe2+, in a batch way at 50 °C. An integrated process has been proposed that combines FR as pretreatment of the CWO process. In the FR step, 10% of H2O2, 10 mg/L of Fe2+, and reaction times shorter than 40 min are used. Efluent from FR step is fed to the CWO reactor at 127 °C. High mineralization (80−90%) and total detoxification of the effluent was obtained at the reactor exit using W/QL values lower than 10 g·min/mL. Therefore, the FR pretreatment enhances remarkably the efficiency of the CWO at moderate temperature conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1004948 [article] Fenton pretreatment in the catalytic wet oxidation of phenol [texte imprimé] / Aurora Santos, Auteur ; Pedro Yustos, Auteur ; Sergio Rodriguez, Auteur . - 2010 . - pp. 5583–5587. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5583–5587 Mots-clés : Catalytic  wet  oxidation  Phenol  (PhOH)  aqueous  solutions  Continuous  three-phase  reactor  FR  pretreatment Résumé : Catalytic wet oxidation (CWO) of 1000 mg/L of phenol (PhOH) aqueous solutions has been carried out using a commercial activated carbon as catalyst, placed in a continuous three-phase reactor at 16 bar, and temperature was changed in the interval 127−160 °C. Pure oxygen was fed as gaseous phase. Pollutant conversion, mineralization, intermediate distribution, and toxicity were measured at the reactor exit. The catalyst weight (W) to liquid flow rate (QL) ratio was varied from 0.3 to 17.5 gACmin/mL. Fenton reagent (FR) has been applied to the same phenolic aqueous samples using different amounts of H2O2 (between 10 and 100% of the stoichiometric dose) and 10 mg/L of Fe2+, in a batch way at 50 °C. An integrated process has been proposed that combines FR as pretreatment of the CWO process. In the FR step, 10% of H2O2, 10 mg/L of Fe2+, and reaction times shorter than 40 min are used. Efluent from FR step is fed to the CWO reactor at 127 °C. High mineralization (80−90%) and total detoxification of the effluent was obtained at the reactor exit using W/QL values lower than 10 g·min/mL. Therefore, the FR pretreatment enhances remarkably the efficiency of the CWO at moderate temperature conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1004948