| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing zinc pyrrolidonecarboxylate dihydrate which is an industrially useful compound, and having a good dissolution quality simply in a high optical purity and a high yield. SOLUTION: This method for producing the zinc pyrrolidonecarboxylate dihydrate having the high optical purity and having the good dissolution quality, in the high yield is provided by adding a zinc salt into an aqueous medium containing a pyrrolidonecarboxylic acid salt as a raw material and separating crystals at a specific pH. COPYRIGHT: (C)2006,JPO&NCIPI
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