Process for the preparation of alkylene glycol

Details Process for the preparation of alkylene glycol Process for the preparation of alkylene glycol

C - Chemistry, Metallurgy

07

C

C07C 31/20 (2006.01) C07C 29/09 (2006.01) C07C 29/10 (2006.01) C07C 29/12 (2006.01)

Patent

CA 2720213

The invention provides a process for the preparation of an alkylene glycol from an alkylene oxide. Alkylene oxide reacts with carbon dioxide in the presence of a carboxylation catalyst to provide alkylene carbonate; alkylene carbonate reacts with water in the presence of a hydrolysis catalyst to provide alkylene glycol. An initial charge of the carboxylation catalyst and an initial charge of the hydrolysis catalyst are added, the degradation and activity of the hydrolysis catalyst are monitored, and when the activity of the hydrolysis catalyst has fallen below a minimum level, an additional charge of the hydrolysis catalyst is added.

La présente invention concerne un procédé de préparation dalkylèneglycol à partir dun oxyde dalkylène. Loxyde dalkylène réagit avec le dioxyde de carbone en présence dun catalyseur de carboxylation pour obtenir du carbonate dalkylène ; le carbonate dalkylène réagit avec leau en présence dun catalyseur dhydrolyse pour produire un alkylèneglycol. Une charge initiale du catalyseur de carboxylation et une charge initiale du catalyseur dhydrolyse sont ajoutées, la dégradation et lactivité du catalyseur dhydrolyse sont surveillées, et lorsque lactivité du catalyseur dhydrolyse a diminué au-dessous dun niveau minimal, une charge supplémentaire du catalyseur dhydrolyse est ajoutée.

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