Patent ID: 9650721
Date: 2017-05-16
CPC Classifications: C02F,C25B

Claim:
1. A sodium hypochlorite generator for decreasing by-product comprising: a water-splitting electrodialysis tank that generates hydrochloric acid and caustic soda using sodium chlorite aqueous solution and water, and supplies them as anode water and cathode water respectively; a diaphragm electrolyzer equipped with an anode chamber into which the sodium chloride aqueous solution is introduced, a cathode chamber into which the water is introduced, and a first cation exchange membrane partitioning the anode chamber and the cathode chamber; an anode water storage tank for storing the anode water and chlorine gas generated by an electrolytic reaction of the anode chamber; a cathode water storage tank for storing the caustic soda and discharging hydrogen gas generated by the electrolytic reaction of the cathode chamber; and a gas-liquid contact area where the caustic soda that is stored in the cathode water storage tank and the chlorine gas that is supplied from the anode water storage tank react in order to generate sodium hypochlorite, wherein the water-splitting electrodialysis tank comprises a first anion exchange membrane, a second cation exchange membrane, an amphoteric ion membrane, a second anion exchange membrane, and a third cation exchange membrane, disposed in order from a surface facing an anode between the anode and a cathode, the amphoteric ion membrane having an anion-exchange functional group at one end facing the second cation exchange membrane and a cation-exchange functional group at another end facing the second anion exchange membrane.