Abstract: To provide a production method and a production apparatus of a sodium hypochlorite solution that can produce a sodium hypochlorite solution with a high available chlorine concentration at a low cost using an on-site facility.

Abstract: The present invention provides an apparatus for producing hypochlorite of any concentration as desired by electrolysis and being easy to maintain. A hypochlorite reaction chamber is provided integrally with an electrolyzer, which is divided by a cation exchange membrane, and introducing means for introducing an anode chamber product and a cathode chamber product is provided between the hypochlorite reaction chamber and the anode chamber or the cathode chamber. As a result, it is possible to obtain an apparatus for producing hypochlorite and being easy to handle, and there is no need to install pipings for chlorine outside the apparatus.

Abstract: A cell is disclosed whereby sea water is electrolyzed to form an aqueous hypochlorite solution with reduced formation of interfering deposits on the electrodes. The cell comprises a plurality of electrolytic cell units having a pair of cathodes and an anode placed between said cathodes, an electrolyte inlet at the lower part of an end frame, an electrolyte outlet at the upper part of an end frame. One of a pair of cathodes has an aperture at a position corresponding to the inlet, and the other cathode has an aperture at a position corresponding to the outlet. The anode has apertures at the position corresponding to the inlet and outlet.