Alkali resistant hyperfiltration membrane
US4895661A · kind A · utility
16Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A novel hyperfiltration membrane and process for making the same is described. The membrane is useful for processing copper electroless solutions to concentrate for re-use salts of chelating agents. The membrane can be prepared by crosslinking a water-compatible polymer in the presence of a strong mineral acid, such as phosphoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.