Process for recovering L-phenylalanine.

摘要

A method to crystallize L-phenylalanine with low water content at a high yield from a side flow generated from a production of alpha -L-aspartyl-L-phenylalanine methyl ester is established. During the recovery of L-phenylalanine by crystallization from a reaction mixture obtained by hydrolysis of at least one side flow generated in the production of alpha -L-aspartyl-L-phenylalanine methyl ester in the presence of a mineral acid, the above hydrolyzed reaction mixture is added to the crystallization slurry containing L-phenylalanine while the pH of the slurry is maintained at 3 - 8 by adding aqueous alkali.