NOUVEAU PROCEDE DE PREPARATION DE LA METHIONINE

PROCEDE DE PREPARATION DE METHIONINE CRISTALLISEE A PARTIR D'UNE SOLUTION AQUEUSE CONTENANT ESSENTIELLEMENT UN METHIONINATE ALCALIN PAR MISE EN OEUVRE D'UN PROCEDE D'ELECTRO-ELECTRODIALYSE. Crystalline methionine is prepared from an alkali metal methioninate by continuously electrolyzing an aqueous solution of the said alkali metal methioninate and a support electrolyte in an intermediate compartment of a cell comprising an anode compartment, an intermediate compartment containing the said aqueous solution and separated from the anode compartment by a cationic membrane, and a cathode compartment separated from the intermediate compartment by a cationic membrane, so that the alkali metal ions of the said methioninate are replaced by hydrogen ions generated in the anode compartment and themselves migrate to the cathode compartment to form an alkali metal hydroxide therein, and recovering free crystalline methionine from the electrolyzed aqueous solution in the said intermediate compartment, and alkali metal hydroxide from the said cathode compartment.