Method of treating reverse osmosis membrane element, and reverse osmosis membrane module
US6821430B2 · kind B2 · utility
26Cited by
11References
23Claims
0Family size
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Key dates
| Filing date | Sep 18, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Sep 18, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In the treatment, a reverse osmosis membrane element having a polyamide skin layer is loaded in a pressure vessel in a membrane separator and contacted with a bromide-containing aqueous solution of free chlorine. The thus treated reverse osmosis membrane element retains for a long time its effect of reducing solute concentration in a solution treated with the reverse osmosis membrane and rejects efficiently non-electrolytic organic materials or substances such as boron that will not be dissociated in a neutral region. A reverse osmosis membrane module having the thus treated reverse osmosis membrane element is provided as well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.