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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. In production of a sodium hypochlorite solution by feeding secondary salt water as an aqueous sodium chloride solution, in an electrolyzer 10 comparted into an anode chamber 2 and a cathode chamber 3 by an ion-exchange membrane 1, to the anode chamber and, after electrolysis, introducing an anolyte and a generated chlorine gas in the anode chamber and an aqueous sodium hydroxide solution generated in the cathode chamber into a reaction tank 20 to allow the anolyte, the chlorine gas, and the generated aqueous sodium hydroxide solution as a catholyte to react in the reaction tank, a primary salt water generation step of dissolving raw salt G containing sodium chloride as a main component in purified water B to generate primary salt water, and a chelating step of chelating the primary salt water to generate secondary salt water A are included, in which a decomposition rate of salt ranges from 80 to 95%.

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First Claim