Production of aqueous metal hydroxide solutions of low metal halide concentration
US3935096A · kind A · utility
6Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Jan 2, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cation-active permselective membrane of a hydrolyzed copolymer of a perfluorinated olefin and a fluorosulfonated perfluorovinyl ether, a modification thereof, or sulfostyrenated perfluorinated ethylene propylene copolymer is employed to dialytically pass metal hydroxide from an aqueous solution thereof containing metal halide halates, thereby purifying the metal hydroxide of the metal halide. The named cation-active permselective membrane materials resist deterioration by the halates, hydroxide and halide components of the solution being purified. The invention also includes a dialysis cell for effecting the purification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.