METHOD FOR PRODUCING POLYSULFIDE BY ELECTROLYTIC OXIDATION

摘要

A method for producing a polysulfide which comprises introducing a solution containing a polysulfide ion to an anode chamber of an electrolysis vessel having an anode chamber equipped with a porous anode having a physically continuous, three dimensional network structure and being made of nickel at least with respect to the surface thereof, a cathode chamber equipped with a cathode and a diaphragm separating the anode and the cathode chambers, and subjecting the solution to electrolytic oxidation, to thereby produce a polysulfide ion. According to this method, a digesting liquor containing a polysulfide ion in a high concentration can be produced from a white liquor in a pulp production process with almost no by-production of thiosulfate ion, with high selectivity and with a low consumption of electric power.