Patent ID: 6280980
Filing Date: 2001-08-28
Classification: C12P

Abstract:
A process for production of L-aspartic acid comprising the steps of (1) contacting (A) an eznzyme-containing material having maleate isomerase activity and aspartase activity, or (B) an enzyme-containing material having maleate isomerase activity and an enzyme-containing material having aspartase activity, with an aqueous substrate solution containing maleic acid and ammonia, and/or mono or di-ammonium maleate, to form L-ammonium aspartate in a reaction solution, (2) adding said reaction solution to an aqueous solution of maleic acid or maleic anhydride at a controlled rate to crystallize L-aspartic acid in a mother liquor, and (3) recovering said L-aspartic acid from said mother liquor.