C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 31/20 (2006.01) C07C 29/09 (2006.01) C07C 29/12 (2006.01)
Patent
CA 2279815
A process for producing an alkylene glycol, which is a continuous process for producing an alkylene glycol comprising the following steps (1) to (4), wherein the hydrolysis step (2) is divided into a plurality of stages, and the hydrolysis is carried out so that the water concentration in a reaction stage wherein the conversion of the alkylene carbonate is at least 60%, is from 15 to 30 wt%: (1) a carbonating step of reacting an alkylene oxide with carbon dioxide gas in the presence of a carbonating catalyst to form a reaction solution containing an alkylene carbonate, (2) a hydrolysis step of hydrolyzing the reaction solution obtained in step (1) while releasing carbon dioxide gas, to form an aqueous alkylene glycol solution, (3) a distillation step of distilling the aqueous alkylene glycol solution to obtain at least a dehydrated alkylene glycol and a solution containing the carbonating catalyst, and (4) a recycling step of supplying the solution containing the carbonating catalyst to the carbonating step (1).
Kawabe Kazuki
Nagata Kouichi
Mitsubishi Chemical Corporation
Smart & Biggar
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