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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

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