Treatment of composite polyamide membranes via substitution with amine reactive reagents
US4960517A · kind A · utility
40Cited by
5References
22Claims
0Family size
Assignee
Inventor
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 an amine-reactive reagent selected from a carboxylic acid ester, a carboxylic acid anhydride, an amine-reactive organic halogen compound, an ethylenically unsaturated hydrocarbon, or a 1,3-propane sultone, at conditions whereby the passage 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.