A polyethersulfone ammonia separation membrane based on imidazolium-cobalt coordination synergy for ammonia separation and its preparation method.

By introducing an imidazolium-cobalt coordination synergistic structure into the polyethersulfone membrane, the selective dissolution and transport of ammonia molecules are enhanced, solving the problems of insufficient selectivity and permeability of existing ammonia separation membranes, and achieving efficient and low-energy ammonia separation.

CN122076264APending Publication Date: 2026-05-26FUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU UNIV
Filing Date
2026-03-17
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing ammonia separation membranes have low ammonia selectivity and low ammonia permeation flux, making it difficult to achieve efficient and low-cost ammonia separation.

Method used

An imidazolium-cobalt coordination synergistic polyethersulfone ammonia separation membrane is used. By introducing imidazolium cation sites into the polyethersulfone membrane and utilizing cobalt thiocyanate coordination anions to form a specific coordination adsorption microenvironment, the selective dissolution and transfer of ammonia molecules are enhanced.

Benefits of technology

It achieves a balance between high ammonia selective permeability and high ammonia permeation flux, with ammonia permeability as high as 1752.6 Barrer and ammonia/nitrogen and ammonia/hydrogen selectivity as high as 425.1 and 132.8 respectively, reducing membrane fabrication costs.

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Abstract

This invention discloses a polyethersulfone (PES) ammonia separation membrane based on imidazolium-cobalt coordination synergy and its preparation method, comprising the following steps: using polyethersulfone as a raw material, it undergoes a chloromethylation reaction under anhydrous conditions to introduce a -CH2Cl active site into the aromatic ring side chain of polyethersulfone, thereby obtaining chloromethylated polyethersulfone; the chloromethylated polyethersulfone is subjected to a nucleophilic substitution reaction with an imidazolium compound to obtain imidazolium-functionalized polyethersulfone with chloride ions as the counter ion; and after membrane formation, the imidazolium-functionalized polyethersulfone membrane is immersed in a mixed solution of potassium thiocyanate and cobalt chloride, utilizing the in-situ formed cobalt thiocyanate coordination anion to counteract the chloride ion. ‑ By performing a displacement reaction, a polyethersulfone ammonia separation membrane based on imidazolium-cobalt coordination synergy is obtained. The polymer membrane obtained in this invention has a stronger selective dissolution and enhanced transfer capability for ammonia, and can achieve efficient and stable ammonia enrichment in the separation of ammonia-containing mixed gases.
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