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Abstract

A process for preparing a storage-stable aqueous solution comprising hypochlorous acid and/or hypochlorite includes introducing an aqueous NaCl solution into an electrolysis cell comprising a cathode compartment and an anode compartment separated by a membrane, wherein the aqueous NaCl solution is introduced into the cathode compartment via a first feed line and into the anode compartment via a second feed line, and wherein the aqueous NaCl solution comprises more than 100 ppm NaCl and has an electrical conductivity of less than 5 mS/cm, applying a direct current to a cathode in the cathode compartment and to an anode in the anode compartment to produce a cathode solution in the cathode compartment and an anode solution in the anode compartment, and mixing a portion of the cathode solution with the aqueous NaCl solution prior to its introduction into the anode compartment and/or with the anode solution in the anode compartment and/or with the anode solution in a discharge line associated with the anode compartment, to produce a storage-stable aqueous solution comprising hypochlorous acid and/or hypochlorite dischargeable via discharge line and has a pH value of 5 to 6.

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First Claim