Resolution of dl-glutamic acid

Claim 1

IN A METHOD FOR RESOLVING A DL-GLUTAMIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF DL-GLUTAMIC ACID, DL-GLUTAMIC ACID HYDROCHLORIDE, DL-GLUTAMIC ACID HYDROBROMIDE, AND MONOAMMONIUM DL-GLUTAMATE, WHICH METHOD COMPRISES SEPARATING A PORTION OF ONE ENANTIOMORPH, A, THEREFROM, LEAVING AN UNBALANCED MIXTURE OF THE ENANTIOMORPHS CONTAINING AN EXCESS OF THE OTHER ENTANTIOMORPHS CONTAINING AN EXCESS OF THE OTHER OF SAID OTHER ENANTIOMORPH, B, FROM A SOLUTION OF SAID UNBALANCED MIXTURE, LEAVING A MOTHER LIQUOR COMPRISING THE DL-GLUTAMIC AND COMPOUND, RACEMIZING AND CONVERTING SAID ENANTIOMORTH B TO DL-PYRROLIDONECARBOXYLIC ACID, HYDROLYZING DL-PYRROLIDONECARBOXYLIC ACID VALUES OBTAINED THEREBY TO DL-GLUTAMIC ACID, RECOVERING DLGLUTAMIC ACID FROM THE HYDROLYZATE, AND RECYCLING THE DL-GLUTAMIC ACID TO FURTHER RESOLUTION, DESALTING SAID MOTHER LIQUOR COMPRISING THE DL-GLUMATIC ACID COMPOUND, ACIDIFYING THE DESALTED MOTHER LIQUOR AROUND PH 3.2, CRYSTALLIZING DL-GLUTAMIC ACID THEREFROM, AND RECYCLING THE DL-GLUTAMIC ACID TO FURTHER RESOLUTION, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID HYDROLYSIS OF DL-PYRROLIDONECARBOXYLIC ACID VALUES UNDER ACID CONDITIONS, AND EMPLOYING THE RESULTING HYDROLYZATE FOR ACIDIFICATION OF THE DESALTED MOTHER LIQUOR TO AROUND PH 3.2.