Preparation method of low-pressure high-desalination-rate reverse osmosis membrane

By introducing the prepolymerization of picolinic acid and m-phenylenediamine during the reverse osmosis membrane preparation process, the problem of insufficient desalination rate under low pressure conditions in the existing technology is solved, achieving a highly efficient desalination effect and enhancing the oxidative stability of the membrane.

CN122141499APending Publication Date: 2026-06-05WANHUA CHEM GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WANHUA CHEM GRP CO LTD
Filing Date
2024-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In existing technologies, there is still room for improvement in the desalination rate of reverse osmosis membranes, especially under low-pressure conditions where efficient desalination is difficult to achieve.

Method used

A low-pressure, high-desalination-rate reverse osmosis membrane was prepared by prepolymerizing picolinic acid with the aqueous phase monomer m-phenylenediamine and then performing interfacial polymerization with the oil phase monomer trimesoyl chloride. The membrane performance was improved by uniformly dispersing picolinic acid within the polyamide layer.

Benefits of technology

While ensuring flux, the desalination rate of the membrane was significantly improved, the resistance to oxidizing substances was enhanced, and the desalination performance of the membrane was improved.

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Abstract

The application provides a preparation method of a low-pressure high-desalination reverse osmosis membrane, wherein a small amount of picolinic acid is added in an aqueous solution, and the picolinic acid is pre-reacted with part of amino groups in m-phenylenediamine to participate in an interfacial polymerization process, so that the picolinic acid is successfully introduced into polyamide. The picolinic acid with a special structure is uniformly dispersed in the polyamide layer, the cross-linking structure of the polyamide is increased, the selectivity of the membrane is improved, and the method has a wide application prospect in the fields of industrial wastewater, zero discharge and the like.
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