Chlorine tolerant composite semipermeable membrane
US4913816A · kind A · utility
23Cited by
1References
9Claims
0Family size
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Key dates
| Filing date | Dec 1, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Dec 1, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/1251
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A thin film composite (TFC) semipermeable membrane on a semiporous substrate is produced by an interfacial polymerization reaction between (1) an aqueous phase comprising a blend of water soluble and water dispersable compounds, (the latter being a chlorine or other oxidant neutralizer which protects the resulting semipermeable membrane from short term damage by chlorine or other oxidants) and (2) an organic phase comprising polyfunctional crosslinking reagents capable of reacting and/or polymerizing with one or more of the ingredients of said aqueous phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.