A method for preparing a polyamide reverse osmosis membrane for high pressure seawater desalination
By adding tetraethylammonium bromide catalyst to the aqueous solution and optimizing the interfacial polymerization reaction, a high-density polyamide reverse osmosis membrane was prepared, which solved the problems of low water flux and desalination rate decay under high pressure and high salt environment, and achieved high-efficiency seawater desalination performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XINYU (JIANGSU) ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2026-04-29
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional polyamide reverse osmosis membranes suffer from low water flux, easy degradation of desalination rate, and poor long-term operational stability under high pressure and high concentration of saline environment. Traditional additives cannot synergistically improve membrane flux and desalination rate.
Using tetraethylammonium bromide as a phase transfer catalyst, it works in an aqueous solution with polyamine monomers, acid absorbents, and pH adjusters to form a high-density and uniform polyamide separation layer through interfacial polymerization, thus preparing a reverse osmosis membrane for high-pressure seawater desalination.
Under high pressure (5.5-8.0MPa) and high salt concentration (32-45g/L NaCl) conditions, the water flux is significantly increased by 15%-40%, the desalination rate is maintained above 99.75%, and the long-term operation stability is excellent.
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