peroxydisulfuric acid and salts thereof are produced electrochemically from an aqueous acid sulfate solution in a cascading series of bipolar electrolytic cells having a cell body frames of polyvinyl chloride which are bonded with a vinyl ester polymer . an aqueous solution of peroxydisulfuric acid and salts thereof are withdrawn from the anode compartment of the last cell in the series , and metal impurities are removed by treatment with an ion exchange resin . hydrogen peroxide is produced by hydrolyzing persulfuric acid and salts thereof . the sulfuric acid produced is recycled to the first cell in the series of cascading electrolytic cells .