METHOD FOR PRODUCING ALKALI METAL SALT OF L-ASCORBIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for continuously producing an alkali metal salt of L-ascorbic acid at an inexpensive cost of apparatus without causing reduction in yield. SOLUTION: In the case of producing the alkali metal salt of L-ascorbic acid by a method including a process (a) for esterifying 2-keto-L-gluconic acid or diacetone-2-keto-L-gluconic acid with a 1-10C alcohol in the presence of an acid catalyst and a process (b) for rearranging a formed 2-keto-L-gluconic acid 1-10C alkyl ester in the presence of a 1-10C alkali metal alcoholate, the treatment process (a) and the treatment process (b) are continuously carried out.