Method for the production of 1,6-hexanediol

Details Method for the production of 1,6-hexanediol Method for the production of 1,6-hexanediol

C - Chemistry, Metallurgy

07

C

C07C 29/17 (2006.01) C07C 29/149 (2006.01) C07C 31/20 (2006.01) C07C 67/347 (2006.01) C07C 69/593 (2006.01)

Patent

CA 2508727

The invention relates to a method for producing 1,6-hexanediol having a purity of > 99.5 wt. % by catalytic dimerisation of acrylic acid esters, catalytic hydrogenation of the thus obtained hexene diacidic diester in order to form 1.6-hexanediol. Said method consists in: a) dimerising C1- C8-acrylic acid esters in the presence of at least one rhodium compound in order to form mixtures predominantly of 2- and 3-hexene diacdic diesters, b) hydrating the obtained dimerisation discharge in the presence of chrome-free catalysts containing mainly copper as a hydrogenation component and c) purifying the thus obtained raw 1.6-hexanediol by fractionating distillation.

L'invention concerne un procédé de production de 1,6-hexanediol d'une pureté >= à 99,5 % en poids par la dimérisation catalytique d'esters d'acide acrylique et l'hydrogénation catalytique des diesters d'acide hexènedioïque ainsi obtenus pour permettre l'obtention de 1,6-hexanediol. Ledit procédé consiste : a) à dimériser des esters d'acide acrylique C¿1? à C¿8? en présence d'au moins un composé de rhodium pour produire des mélanges principalement à partir de diesters d'acide 2- et 3-hexènedioïque, b) à hydrogéner le produit de dimérisation obtenu en présence de catalyseurs sans chrome, contenant principalement du cuivre comme constituants d'hydrogénation, et c) à purifier le 1,6-hexanediol brut ainsi obtenu par distillation par fractionnement.

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