Abstract: A method for purifying a dipeptide ester by electrolysis in an electrolytic cell comprising an anode compartment, a cathode compartment and a central compartment partitioned by anion exchange membranes, which comprises supplying an aqueous dipeptide ester solution containing an inorganic acid to the central compartment defined by said anion exchange membranes, an aqueous solution containing a basic substance or an aqueous electrolyte solution containing a basic substance to the cathode compartment and an aqueous electrolyte solution to the anode compartment, supplying hydroxyl ions from the cathode compartment to the central compartment through the anion exchange membrane to neutralize the aqueous dipeptide ester solution containing the inorganic acid and removing anions of the inorganic acid in the aqueous dipeptide ester solution from the central compartment to the anode compartment through the anion exchange membrane.

Abstract: Electrolytic cell of single electrode type or multiple electrodes type, which is divided into the anode chamber and the cathode chamber with employing a cation exchange membrane and used for the electrolysis of the aqueous solution of alkali chloride, characterized in comprising(a) anode chamber and cathode chamber,(b) partition having a thickness of less than 6 mm to separate the anode chamber from the cathode chamber,(c) ribs joining the electrode with the partition.