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Oxidative dimerization of phenol based on micromixing in single- and two-phase systems / Yoshihito Okubo in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7154–7160 Titre : Oxidative dimerization of phenol based on micromixing in single- and two-phase systems Type de document : texte imprimé Auteurs : Yoshihito Okubo, Auteur ; Hideyuki Higashimura, Auteur ; Kazuhiro Mae, Auteur Année de publication : 2008 Article en page(s) : p. 7154–7160 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Phenol  Oxidative  polymerization  Microdroplets  Single-  and  two-phase  systems Résumé : It is an important technique to obtain target products with higher yields by controlling the reaction and mass transfer. In this work, we focused on molecular weight control in the oxidative polymerization of phenol. We attempted selective production of phenol dimers through the formation of microdroplets in both single- and two-phase systems. In a single-phase system, selectivity of dimers to polymers can be improved by rapidly mixing ingredients using a micromixer. Further, we clarified the conditions to utilize such microspace effects by comparing the initial reaction time constant with the mixing time constant by order-of-magnitude estimation. In a two-phase system, it was clarified that controlling of mass transfer by formation of microdroplets using a micromixer was effective in the control of consecutive elementary reactions though the dimer selectivity hardly changes and the effect of micromixing was limited. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800054n [article] Oxidative dimerization of phenol based on micromixing in single- and two-phase systems [texte imprimé] / Yoshihito Okubo, Auteur ; Hideyuki Higashimura, Auteur ; Kazuhiro Mae, Auteur . - 2008 . - p. 7154–7160. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7154–7160 Mots-clés : Phenol  Oxidative  polymerization  Microdroplets  Single-  and  two-phase  systems Résumé : It is an important technique to obtain target products with higher yields by controlling the reaction and mass transfer. In this work, we focused on molecular weight control in the oxidative polymerization of phenol. We attempted selective production of phenol dimers through the formation of microdroplets in both single- and two-phase systems. In a single-phase system, selectivity of dimers to polymers can be improved by rapidly mixing ingredients using a micromixer. Further, we clarified the conditions to utilize such microspace effects by comparing the initial reaction time constant with the mixing time constant by order-of-magnitude estimation. In a two-phase system, it was clarified that controlling of mass transfer by formation of microdroplets using a micromixer was effective in the control of consecutive elementary reactions though the dimer selectivity hardly changes and the effect of micromixing was limited. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800054n