METHOD OF PRODUCING GLYOXAL DIACETAL

摘要

PROBLEM TO BE SOLVED: To provide a method of producing glyoxal diacetal that uses a water- miscible alcohol and permits the continuous operation in high yield. SOLUTION: The reaction of 40-75 wt.% of glyoxal aqueous solution with a monohydric alcohol is carried out in the presence of an acid catalyst to produce a glyoxal diacetal. In this case, a liquid mixture including the alcohol and glyoxal in at least 15:1 molar ratio and water in an amount of≤8 wt.% at the start of the reaction is brought into contact with an acid catalyst so that the alcohol used may not be distilled off over 5 wt.% until the concentration of the diacetal formed in the reaction mixture attains at least 70% of the equilibrium concentration. COPYRIGHT: (C)2003,JPO