Inventors:
Kenneth J. Radimer - Little Falls NJ
Michael J. McCarthy - Trenton NJ
Assignee:
FMC Corporation - Philadelphia PA
International Classification:
C25B 128
Abstract:
Preparation of sodium persulfate in an electrolytic cell having a protected cathode is obtained by the direct electrolysis of aqueous anolyte solution in which there is initially dissolved a sufficient amount of a mixture of sulfates and peroxydisulfates of sodium and ammonium to provide an anolyte feed solution containing by weight 5 to 9% sodium ions, 12 to 30% sulfate ions, 1 to 4% ammonium ions, an effective amount of a polarizer, and optionally up to 20% peroxydisulfate ions. The cell catholyte is a sulfuric acid solution, which may contain Na. sup. + and NH. sub. 4. sup. + values, and the electric current density is at least 0. 5 amperes per square centimeter of platinum surface of the anode.