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Three-phase catalytic hydrogenation of a functionalized alkyne / Andrea Bruehwiler in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6862–6869 Titre : Three-phase catalytic hydrogenation of a functionalized alkyne : mass transfer and kinetic studies with in situ hydrogen monitoring Type de document : texte imprimé Auteurs : Andrea Bruehwiler, Auteur ; Natalia Semagina, Auteur ; Martin Grasemann, Auteur Année de publication : 2008 Article en page(s) : p. 6862–6869 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Mass  transfer  interactions  Hydrogen  Catalytic  hydrogenation Résumé : Systematic studies of mass transfer interactions with intrinsic reaction kinetics were performed for the three-phase selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol (MBE) over a modified Pd/CaCO3 catalyst under solvent free conditions. Hydrogen concentration in the liquid phase (CH2,b) was monitored in situ during the catalytic reaction by means of the “Fugatron” analyzer. Reactions were carried out in an autoclave at different stirring rates at two concentrations of hydrogen (5 and 13 mol·m−3). For stirring speeds higher than 1500 rpm no influence of gas−liquid mass transfer was observed. Hydrogen liquid−solid (L-S) mass transfer was found to be negligible, whereas the MBY mass L-S transfer becomes important at high MBY conversions at high hydrogen concentration. Low stirrer speed caused the reaction rate and MBE selectivity to decrease. No internal mass transfer limitations were observed, and conditions for the kinetic regime were found. The kinetics modeled followed the Langmuir−Hinshelwood mechanism and was consistent with the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800070w [article] Three-phase catalytic hydrogenation of a functionalized alkyne : mass transfer and kinetic studies with in situ hydrogen monitoring [texte imprimé] / Andrea Bruehwiler, Auteur ; Natalia Semagina, Auteur ; Martin Grasemann, Auteur . - 2008 . - p. 6862–6869. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6862–6869 Mots-clés : Mass  transfer  interactions  Hydrogen  Catalytic  hydrogenation Résumé : Systematic studies of mass transfer interactions with intrinsic reaction kinetics were performed for the three-phase selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol (MBE) over a modified Pd/CaCO3 catalyst under solvent free conditions. Hydrogen concentration in the liquid phase (CH2,b) was monitored in situ during the catalytic reaction by means of the “Fugatron” analyzer. Reactions were carried out in an autoclave at different stirring rates at two concentrations of hydrogen (5 and 13 mol·m−3). For stirring speeds higher than 1500 rpm no influence of gas−liquid mass transfer was observed. Hydrogen liquid−solid (L-S) mass transfer was found to be negligible, whereas the MBY mass L-S transfer becomes important at high MBY conversions at high hydrogen concentration. Low stirrer speed caused the reaction rate and MBE selectivity to decrease. No internal mass transfer limitations were observed, and conditions for the kinetic regime were found. The kinetics modeled followed the Langmuir−Hinshelwood mechanism and was consistent with the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800070w