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AN IMPROVED ELECTROLYSIS PROCESS FOR PRODUCING AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION BY ELECTROLYSING AN AQUEOUS ALKALI METAL HALIDE SOLUTION USING AN ASBESTOS DIAPHRAGM OR AN ION EXCHANGE MEMBRANE
AN IMPROVED ELECTROLYSIS PROCESS FOR PRODUCING AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION BY ELECTROLYSING AN AQUEOUS ALKALI METAL HALIDE SOLUTION USING AN ASBESTOS DIAPHRAGM OR AN ION EXCHANGE MEMBRANE
PURPOSE: To prevent economically the deterioration of a low hydrogen overvoltage cathode during stoppage of electrolysis by adding a reducing agent to the cathode chamber of an electrolytic cell for an aq. alkali metal salt soln. using an asbestos diaphragm or ion exchange membrane while the electrolysis is stopped. CONSTITUTION: A reducing agent is added to the cathode chamber of an electrolytic cell for an aq. alkali metal salt soln. having a low hydrogen overvoltage cathode and using an asbestos diaphragm or ion exchange membrane while the electrolysis is under stoppage to prevent the elution of an active metal and to prevent the deterioration of the low hydrogen overvoltage cathode. ?1 kind among sulfite, phosphite, hypophosphite, dithionite and pyrosulfite are used as the above-mentioned reducing agent and the amt. of said agent to be added is adequately 0.01W100 equiv. per m2 of the projecting area of the low hydrogen overvoltage cathode. It is effective to stop the electrolysis after adding preliminarily the reducing agent into the cathode chamber. The above-mentioned method is particularly economically effective when applied while the electrolysis is stopped by the short circuiting device of the certain specific electrolytic cell in an electrolytic cell group under operation of which many unit cells are connected to a power source[JP60026687A]
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