Purification of by-product stream in preparation of...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/78 (2006.01) C08G 63/183 (2006.01) C08J 11/02 (2006.01)

Patent

CA 2287934

A process for preparing polytrimethylene terephthalate from 1,3-propanediol and dimethyl terephthalate in which a carbonyl-containing by-product stream is purified by treatment with an acid catalyst. The polytrimethylene terephthalate preparation process involves reacting 1,3-propanediol and dimethyl terephthalate under esterification reaction conditions and distilling off and condensing by-product methanol and 1,3-propanediol streams containing carbonyl compounds such as acrolein. The condensed by-product stream is treated with an acid catalyst such as an acid ion exchange resin to reduce the carbonyl content of the stream.

Ce procédé de préparation de polytriméthylène téréphtalate, à partir de 1,3-propanediol et de diméthyle téréphtalate, est caractérisé par une purification d'un courant de sous-produits contenant carbonyle, exécutée par traitement au moyen d'un catalyseur acide. Ce procédé de préparation de polytriméthylène téréphtalate consiste à faire réagir du 1,3-propanediol et du diméthyle téréphtalate, dans des conditions de réaction d'estérification, à distiller et condenser les courants de sous-produits méthanol et 1,3-propanediol contenant des composés carbonyle tels que l'acroléine, et enfin à traiter le courant condensé de sous-produits à l'aide d'un catalyseur acide, tel qu'une résine échangeuse d'ions acides, afin de réduire la teneur en carbonyle du courant.

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