Membranes prepared via reaction of diazonium compounds or precursors
US4812238A · kind A · utility
28Cited by
25References
20Claims
0Family size
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Key dates
| Filing date | Aug 10, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Aug 10, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved reverse osmosis membrane and process for making the same is described. The membrane is prepared by treating a polymer bearing primary amine groups with nitrous acid or a diazonium compound so as to react the resulting diazonium groups with other groups present. The resulting membrane possesses improved chlorine resistance. When the nitrous acid treatment is employed, the water flux of a polyamide membrane is frequently increased with little or no effect on the salt rejection of the membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.