Production of alkali metal carbonates in a cell having a carboxyl membrane
US4147599A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1977 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Jul 19, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An alkali metal carbonate substantially free of alkali metal chloride is efficiently produced by electrolyzing an alkali metal chloride in an electrolytic cell having anolyte and catholyte compartments separated by a cation-exchange hydraulically impermeable membrane comprised of a thin film of a fluorinated polymer having pendant carboxylic acid or alkali metal carboxylate groups and a cathode spaced apart from the membrane, injecting into the catholyte compartment of the cell carbon dioxide in a quantity sufficient to convert substantially all the alkali metal hydroxide forming therein to the alkali metal carbonate salt, and utilizing a magnitude of electrolyzing current that reduces alkali metal chloride in the catholyte solids to less than 400 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.