Treatment of composite polyamide membranes to improve performance
US5876602A · kind A · utility
68Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1997 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Nov 4, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Composite polyamide reverse osmosis membranes are treated with an aqueous chlorinating agent at a concentration of 200 to 10,000 ppm for a time sufficient to improve flux, lower salt passage and increase the stability to base. In a preferred embodiment the membrane is treated with heated water at temperature of 40.degree. C. to 100.degree. C. before being exposed to the chlorine treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.