PRODUCTION, OF (S,S)-ETHYLENEDIAMINE-N,N'-DISUCCINIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for simply producing a high-purity product of a chelate compound having the biodegradability in high recovery ratio. SOLUTION: The crystallization is carried out in the presence of methanol by adding an inorganic acid thereto in a method for reacting L-aspartic acid with a dihaloethane in the presence of a basic metal compound in an aqueous solvent, producing a metal salt of (S,S)-ethylenediamine-N,N'-succinic acid and providing the (S,S)-ethylenediamine-N,N'-succinic acid from an aqueous solution of the resultant metal salt by the crystallization.