Treatment of composite polyamide membranes with compatible oxidants
US4960518A · kind A · utility
15Cited by
1References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Dec 13, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2323/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A reverse osmosis membrane having improved rejection of sulfuric acid and/or isopropanol is described. The membrane is prepared by treating a crosslinked, polyamide discriminating layer with a compatible oxidizing reagent, such as peracetic acid, periodic acid or chloramine, whereby the passage through the treated membrane of sulfuric acid in a 2 percent aqueous solution at a transmembrane pressure of 400 psi is reduced by at least 30 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.