申请人:Kanatani Eizo
公开号:US20050239764A1
公开(公告)日:2005-10-27
The present invention aims at providing a convenient method of producing zinc pyrrolidonecarboxylate dihydrate, which is an industrially useful compound, with high optical purity, a higher yield, and better dissolution property. The present invention also provides a convenient method of producing zinc pyrrolidonecarboxylate dihydrate with higher optical purity, a higher yield, and better solution property by adding a zinc salt to an aqueous medium containing a salt of pyrrolidonecarboxylic acid as a starting material and separating a crystal from the aqueous medium at a specific pH.
本发明旨在提供一种方便的方法,用于高光学纯度、高产率和更好的溶解性生产工业上有用的二水合吡咯烷酮羧酸锌化合物。本发明还提供了一种方便的方法,通过向含吡咯烷酮羧酸盐为起始材料的水介质中添加锌盐,并在特定pH下从水介质中分离晶体,以生产高光学纯度、高产率和更好的溶解性的二水合吡咯烷酮羧酸锌化合物。