Isomerization of vinyl glycols to unsaturated diols

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 33/035 (2006.01) B01J 29/16 (2006.01) C07C 29/17 (2006.01) C07C 29/56 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2259913

This invention relates to a process for the isomerization of a vinyl glycol to an unsaturated diol in the presence of a rhenium-based catalyst; and to a catalyst for said isomerization. More specifically, this invention relates to the isomerization of 3-butene-1,2-dio to 2-butene-1,4-diol; and to a process for the manufacture of 1,4-butanediol involving the steps of isomerizing 3- butene-1,2-diol to 2-butene-1,4-diol in the presence of said catalyst. The catalyst is characterized in that it comprises a transition metal on a carrier wherein the carrier is a zeolite Y type substance containing silicon and aluminium in a mole ratio of from 1.5 to 1 to 1000 to 1, and the transition metal is rhenium or a rhenium compound and mixtures thereof present in an amount of from 0.1 to 50 weight percent based on total combined weight of the carrier and of the rhenium or rhenium compound and mixtures thereof.

L'invention se rapporte à un procédé d'isomérisation d'un glycol vinylique de sorte qu'un diol insaturé soit formé, en présence d'un catalyseur à base de rhénium, et à un catalyseur à utiliser pour ladite isomérisation. L'invention concerne, plus spécifiquement, l'isomérisation de 3-butène-1,2-diol de sorte qu'un 2-butène-1,4-diol soit formé; et un procédé de fabrication de 1,4-butanediol, qui consiste à isomériser du 3-butène-1,2-diol de sorte que du 2-butène-1,4-diol soit produit, en présence dudit catalyseur. Ledit catalyseur se caractérise en ce qu'il comprend un métal de transition situé sur un support, lequel est une substance du type zéolite Y contenant du silicium et de l'aluminium dans des proportions en mole de l'ordre de 1,5 à 1000 pour 1, et le métal de transition étant du rhénium, un composé de rhénium et des mélanges de ceux-ci à raison d'environ 0,1 à 50 % en poids par rapport au poids total combiné du support et du rhénium ou composé de rhénium et des mélanges de ceux-ci.

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