The present invention is a method for separately collecting an optically active amino acid amide and an optically active amino acid from an aqueous solution containing the optically active amino acid amide and the optically active amino acid together with at least one member selected from the group consisting of an acid, a base and a salt: comprising a neutralization step of neutralizing an acid or a base when the aqueous solution contains the acid or the base; a desalting step of removing a salt contained in the aqueous solution and/or formed in the neutralization step; and a step of collecting the optically active amino acid amide and the optically active amino acid separately from the aqueous solution which has been desalted in the desalting step, by a process which takes advantage of a difference in solubility between the two components in an organic solvent. The desalting step is preferably performed by an electrodialysis process optionally in the state where ammonia is added to the aqueous solution. According to the present invention, an optically active amino acid amide and an optically active amino acid, which are important as intermediates in the production of pharmaceuticals, agricultural chemicals, and various industrial chemicals, can be separately collected with high efficiency by use of an organic solvent.
本发明是一种从含有光学活性
氨基酸酰胺和光学活性
氨基酸的
水溶液中分离收集这两种成分的方法,所述
水溶液中还包含从酸、碱和盐中选择的至少一种物质。所述方法包括以下步骤:(a)当中和步骤:当中所述
水溶液含有酸或碱时,对酸或碱进行中和;(b)脱盐步骤:从
水溶液中去除盐,和/或去除中和步骤中生成的盐;(c)分离收集步骤:利用这两种成分在有机溶剂中的溶解度差异,从已经过脱盐步骤脱盐的
水溶液中分别收集光学活性
氨基酸酰胺和光学活性
氨基酸。脱盐步骤优选通过电渗析法来进行,可以是向
水溶液中加入
氨水的状态。根据本发明,能够利用有机溶剂,将作为制备医药品、农药及各种工业
化学品的重要中间体的光学活性
氨基酸酰胺和光学活性
氨基酸,实现高效分离收集。