公开(公告)号：CA1236114A

公开(公告)日：1988-05-03

申请号：CA444183

申请日：1983-12-23

Applicant: DEGUSSA

Inventor： KARRENBAUER MICHAEL ,  KLEEMANN AXEL ,  LEUCHTENBERGER WOLFGANG ,  MOERCK RUDI

IPC: C07C59/245 ,  C07C51/00 ,  C07C51/42 ,  C07C67/00 ,  C12P7/46

Abstract: The reaction mixtures which result from the enzymatic reaction of fumaric acid to produce L-malic acid contain L-malic acid and unreacted, fumaric acid as salts. For the production of pure solutions of Lmalic acid, the reaction mixtures are treated with cation exchangers at from 50 to 150.degree.C, and the eluates are filtered after being concentrated to an L-malic acid content of from 30 to 80% by weight. The pure L-malic acid is obtained by evaporating the solutions, optionally after a treatment with active carbon.

公开(公告)号：HU195469B

公开(公告)日：1988-05-30

申请号：HU446583

申请日：1983-12-23

Applicant: DEGUSSA

Inventor： KARRENBAUER MICHAEL ,  KLEEMANN AXEL ,  MOERCK RUDI ,  LEUCHTENBERGER WOLFGANG

IPC: C07C51/00 ,  C07C51/42 ,  C07C59/245 ,  C07C67/00 ,  C12P7/46

Abstract: 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 DEG to 150 DEG 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.