The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 1996
Filed:
May. 19, 1995
Applicant:
Inventors:
Assignee:
Nippon Shokubai Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C12P / ;
U.S. Cl.
CPC ...
435109 ; 435829 ; 435849 ; 435874 ;
Abstract
A process for production of L-aspartic acid comprising the steps of (1) contacting (A) an enzyme-containing material having maleate isomerase activity and aspartase activity, or (B) an enzyme-containing product having maleate isomerase activity and an enzyme-containing material having aspartase activity, with a substrate solution containing maleic acid and ammonia, and/or ammonium maleate to form L-aspartic acid, and (2) recovering L-aspartic acid from the reaction solution, characterized by adding maleic anhydride and/or maleic acid to the reaction solution to crystallize L-aspartic acid, and (3) recycling the mother liquors as the substrate solution by addition of ammonia.