Electrolytic production of sodium persulfate
US4144144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Oct 5, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/29
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.