Patent · US Expired

Process for the recovery of malic acid

US4772749A · kind A · utility

4Cited by

3References

24Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Michael Karrenbauer · Radolfzell, DE
Axel Kleemann · Hanau, DE
Wolfgang Leuchtenberger
Rudi E. Moerck · Sanford, US

Key dates

Filing date	Dec 21, 1983
Grant date	Sep 20, 1988
Priority date	—
Expiry date	Dec 21, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC12P7/46
WIPO fieldBiotechnology
WIPO sectorChemistry

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.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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.