Electrolysis of alkali metal chloride
US3933603A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1974 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Apr 23, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B18/021
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Alkali metal hydroxide is produced by electrolysis of alkali metal chloride according to an improved diaphragm process wherein plural cationic ion-exchange membranes are used to divide an electrolytic cell into an anode compartment, at least one middle compartment and a cathode compartment. The ion-exchange membrane confronting anode is preferably substantially resistant to anode reaction products such as chlorine or chlorates. Alkali formed by electrolysis is recovered from cathode compartment or alternatively a portion thereof may be taken out from middle compartments at various concentrations. Alkali metal hydroxide can be produced in high purity and high concentration with excellent efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.