Intensification and selectivity modulation of ion-exchange resin catalyzed alkylation of phenol by microwave / Asraf A. Ali in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6556–6566 Titre : Intensification and selectivity modulation of ion-exchange resin catalyzed alkylation of phenol by microwave Type de document : texte imprimé Auteurs : Asraf A. Ali, Auteur ; Vilas G. Gaikar, Auteur Année de publication : 2011 Article en page(s) : pp 6556–6566 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microwave Kinetic model Alkylation phenol Résumé : Microwave irradiation has been used to intensify the alkylation reaction of phenol with tert-butyl alcohol using ion-exchange resin as the catalyst. About 86% conversion of phenol is obtained in 4 min under microwave irradiation. The major products are ortho-tert-butyl phenol (o-TBP), para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol (2,4-DTBP). o-TBP predominates in the product mixture as the kinetically favored product in shorter reaction times, but p-TBP is the major product for longer reaction times. The selectivity toward ortho- or para-substituted phenols can be manipulated by controlling the exposure time of the reaction mixture to the microwave irradiation. The Langmuir–Hinshelwood–Hougen–Watson (LHHW) surface reaction controlled model was used for the kinetic data analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102051k [article] Intensification and selectivity modulation of ion-exchange resin catalyzed alkylation of phenol by microwave [texte imprimé] / Asraf A. Ali, Auteur ; Vilas G. Gaikar, Auteur . - 2011 . - pp 6556–6566. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6556–6566 Mots-clés : Microwave Kinetic model Alkylation phenol Résumé : Microwave irradiation has been used to intensify the alkylation reaction of phenol with tert-butyl alcohol using ion-exchange resin as the catalyst. About 86% conversion of phenol is obtained in 4 min under microwave irradiation. The major products are ortho-tert-butyl phenol (o-TBP), para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol (2,4-DTBP). o-TBP predominates in the product mixture as the kinetically favored product in shorter reaction times, but p-TBP is the major product for longer reaction times. The selectivity toward ortho- or para-substituted phenols can be manipulated by controlling the exposure time of the reaction mixture to the microwave irradiation. The Langmuir–Hinshelwood–Hougen–Watson (LHHW) surface reaction controlled model was used for the kinetic data analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102051k

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