Use of treated composite polyamide membranes to separate concentrated solute
US4964998A · kind A · utility
35Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Dec 13, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A20/131
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of separating water of reduced concentration of a selected solute via reverse osmosis, wherein the selected solute is sulfuric acid, sodium hydroxide, isopropanol, sodium nitrate or another solute having a much higher solute passage than sodium chloride. The reverse osmosis membrane is prepared by treating a crosslinked, polyamide discriminating layer with an amine-reactive reagent or compatible oxidant at conditions whereby the passage of the selected solute at a selected transmembrane pressure is reduced by at least 30 percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.