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Organocatalysts for the reaction of dimethyl carbonate with 2,4-diaminotoluene / Raquel juàrez in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8043–8047 Titre : Organocatalysts for the reaction of dimethyl carbonate with 2,4-diaminotoluene Type de document : texte imprimé Auteurs : Raquel juàrez, Auteur ; Ana padilla, Auteur ; Avelino Corma, Auteur Année de publication : 2008 Article en page(s) : p. 8043–8047 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : dimethyl  carbonate Résumé : The current limited availability of isoprene and isoamylenes (methyl butenes), which are the feedstock for a variety of petrochemical processes, could be boosted by converting the isopentane contained in the same refinery C5-fractions from which they are obtained. The oxidative dehydrogenation (ODH) of isopentane to isoprene and isoamylenes for this purpose has been studied very little to date. We present here a study of this reaction on oxide catalysts, using oxygen as an oxidant, without any dopant in the feed. After a broad catalyst formulations screening, a V−Mg oxide catalyst (15 wt % V2O5) was selected to study the influence of the reaction parameters (temperature, residence time, and feed composition). Selectivity values of ca. 25% to isoprene, and 70% to isoprene plus isomylenes, could be attained under selected reaction conditions. These results are promising for the direct conversion of the branched C5-hydrocarbons fraction to isoprene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8003495 [article] Organocatalysts for the reaction of dimethyl carbonate with 2,4-diaminotoluene [texte imprimé] / Raquel juàrez, Auteur ; Ana padilla, Auteur ; Avelino Corma, Auteur . - 2008 . - p. 8043–8047. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8043–8047 Mots-clés : dimethyl  carbonate Résumé : The current limited availability of isoprene and isoamylenes (methyl butenes), which are the feedstock for a variety of petrochemical processes, could be boosted by converting the isopentane contained in the same refinery C5-fractions from which they are obtained. The oxidative dehydrogenation (ODH) of isopentane to isoprene and isoamylenes for this purpose has been studied very little to date. We present here a study of this reaction on oxide catalysts, using oxygen as an oxidant, without any dopant in the feed. After a broad catalyst formulations screening, a V−Mg oxide catalyst (15 wt % V2O5) was selected to study the influence of the reaction parameters (temperature, residence time, and feed composition). Selectivity values of ca. 25% to isoprene, and 70% to isoprene plus isomylenes, could be attained under selected reaction conditions. These results are promising for the direct conversion of the branched C5-hydrocarbons fraction to isoprene. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8003495