Process for the production of alkylene carbonate and use of...

C - Chemistry – Metallurgy – 07 – D

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C07D 317/36 (2006.01) C07C 29/128 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2643253

An alkylene carbonate is produced by the reaction of an alkylene oxide with carbon dioxide in the presence of a phosphonium compound as catalyst in a process in which (a) the alkylene oxide, carbon dioxide and the phosphonium catalyst are continuously introduced into a reaction zone from which a product stream containing alkylene carbonate and catalyst is withdrawn, (b) alkylene carbonate and a mixture of alkylene carbonate and phosphonium catalyst are separated from the product stream and, and (c) the alkylene carbonate, separated in step (b), is recovered as product, and (d) the mixture of alkylene carbonate and phosphonium catalyst is continuously recycled to the reaction zone. The alkylene carbonate thus produced is suitably reacted with an alkanol to produce an alkane diol and a dialkyl carbonate.

L'invention concerne un procédé de production de carbonate d'alkylène. Dans ce procédé, le carbonate d'alkylène est produit par la réaction d'un oxyde d'alkylène et d'un dioxyde de carbone, en présence d'un composé phosphonium servant de catalyseur. Le procédé de l'invention comprend les étapes suivantes: (a) l'oxyde d'alkylène, le dioxyde de carbone et le catalyseur de phosphonium sont introduits en continu dans la zone réactionnelle à partir de laquelle est extrait un flux de produit contenant du carbonate d'alkylène et le catalyseur; (b) le carbonate d'alkylène et un mélange de carbonate d'alkylène et de catalyseur de phosphonium sont séparés du flux de produit; (c) le carbonate d'alkylène, séparé à l'étape (b) est extrait en tant que produit; et (d) le mélange de carbonate d'alkylène et de catalyseur de phosphonium est continuellement recyclé dans la zone réactionnelle. Le carbonate d'alkylène ainsi produit réagit de manière appropriée avec un alcanol pour produire un alcanediol et un carbonate de dialkyle.

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