Complex nanofiltration membrane and the preparation thereof
AssigneesChina Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
InventorsYang ZHANG, Yiqun LIU, Guoyuan PAN, Hao YAN, Jian XU, Min GUO
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Abstract
A complex nanofiltration membrane comprising a substrate and a separating layer, wherein the separating layer is an oxidant-treated, crosslinked network structure formed from a hydroxyl-containing polymer, a thiol-containing silane coupling agent and a crosslinking agent, is disclosed. Also disclosed are a process for preparing the complex nanofiltration membrane and use of the complex nanofiltration membrane in water treatment.
Claims20
A complex nanofiltration membrane, comprising a substrate and a separating layer, wherein the separating layer is an oxidant-treated, crosslinked network structure formed from a hydroxyl-containing polymer, a thiol-containing silane coupling agent and a crosslinking agent.
A process for preparing a complex nanofiltration membrane, comprising the steps of
- (1) dissolving a hydroxyl-containing polymer and a thiol-containing silane coupling agent in a solvent to prepare a coating solution;
- (2) applying the coating solution on a substrate to form an initial membrane;
- (3) immersing the initial membrane from step (2) in a crosslinking solution comprising a crosslinking agent and a crosslinking catalyst in a solvent to conduct a crosslinking reaction, to obtain an initial complex nanofiltration membrane comprising the substrate and a separating layer, which is a crosslinked network structure positioned on the surface of the substrate;
- and
- (4) treating the initial complex nanofiltration membrane with an aqueous solution containing an oxidant, to afford a final complex nanofiltration membrane.
Dependencies are inferred from the claim text.