Cell having catalytic electrodes bonded to a membrane separator
US4276146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Dec 7, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B9/23
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A halogen, such as chlorine, is generated in an electrolysis cell in which at least one of the cell electrodes is bonded to the surface of a solid but porous membrane which separates the cell into anode and cathode chambers. A pressurized aqueous metal halide such as brine is electrolyzed at the anode to produce chlorine. Brine anolyte and sodium ions are hydraulically transported across the porous membrane to produce caustic (NaOH) at the cathode. By bonding at least one gas permeable, porous electrode to the hydraulically permeable membrane, the cell voltage for electrolysis of brine is considerably lower than that required for asbestos diaphragm cells, while achieving high cathodic current efficiencies by minimizing back migration of caustic to the anode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.