Degussa Aktiengesellschaft

Rudi Moerck

Axel Kleemann

Wolfgang Leuchtenberger

Michael Karrenbauer

The reaction mixture obtained in the enzymatic reaction of fumaric acid to form L-malic acid contains the L-malic acid and unreacted fumaric acid as their salts. To recover pure solutions of L-malic acid the reaction mixture is treated at 50.degree. to 150.degree. C. with cation exchangers. The eluate after concentration to 30 to 80 weight % content of L-malic acid is filtered. The pure L-malic acid is recovered by evaporating the solutions, in a given case after treatment with activated carbon.

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Gelnhausen-Meerholz, Germany

Rudi Moerck