Preparation of diacetals of glyoxal

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 47/127 (2006.01) C07C 41/50 (2006.01) C07C 43/303 (2006.01) C07C 45/64 (2006.01) C07C 47/198 (2006.01)

Patent

CA 2405920

A process is described fox preparing diacetals of glyoxal by reacting from 40 to 75% by weight aqueous glyoxal with monohydric alcohols in the presence of an acid catalyst, which comprises leaving a liquid mixture which, at the beginning of the reaction, comprises alcohol and glyoxal in a molar ratio of at least 15:1 and also water in a concentration of not more than 8% by weight in contact with the acid catalyst until concentration in the reaction mixture of the diacetal formed reaches at least 70% of the equilibrium concentration without more than 5% by weight of the alcohol used having already been distilled off.

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