申请人:Tanabe Seiyaku Co., Ltd.
公开号:US04124636A1
公开(公告)日:1978-11-07
An aqueous solution of L-malic acid and potassium ion is prepared having a pH of no more than 6.8. The aqueous solution is cooled to initiate crystallization of a potassium salt of L-malic acid, and the aqueous mixture obtained is allowed to stand at a pH of 5.3 to 6.8 until it substantially reaches liquid-solid equilibrium. The resultant crystals of monopotassium L-malate monohydrate are collected therefrom. The monopotassium L-malate monohydrate thus obtained may be dried to give the corresponding anhydrate. Monopotassium L-malate and its monohydrate are stable, non-hygroscopic crystals.
制备了一个L-苹果酸和钾离子的水溶液,其pH不超过6.8。将水溶液冷却以引发L-苹果酸钾盐的结晶,并将得到的水溶混合物在pH为5.3至6.8的条件下静置,直至其基本达到液固平衡。从中收集得到单水合单钾L-苹果酸盐的晶体。得到的单水合单钾L-苹果酸盐可以干燥以得到相应的无水物。单水合单钾L-苹果酸盐及其单水合物是稳定的、不吸湿的晶体。