A covalent organic framework / polyether sulfone hybrid matrix membrane, and a preparation method and application thereof

A method for preparing covalent organic framework/polyethersulfone mixed matrix membranes by in-situ polymerization at the solid/liquid interface solves the problems of dispersion and brittleness of mixed matrix membranes, and achieves high-efficiency gas separation performance and stability, especially selective separation of H2/CO2.

CN119455704BActive Publication Date: 2026-05-01NINGXIA UNIVERSITY
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Patent Information

Application Number
CN202411795946.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2026-05-01
Estimated Expiration
2044-12-09

AI Technical Summary

Technical Problem

Existing mixed matrix membranes suffer from problems such as poor packing material dispersibility, easy agglomeration, and easy sedimentation. Furthermore, covalent organic framework membranes are brittle, which affects gas separation performance.

Method used

A covalent organic framework/polyethersulfone hybrid matrix membrane preparation method is adopted, which utilizes the non-solvent-induced phase separation of polymers to carry out in-situ polymerization at the solid/liquid interface, and combines commercial glass fiber filter membranes as substrates to form a uniform and stable membrane structure.

Benefits of technology

It improves membrane stability and gas separation performance, achieving an H2 flux of 2671 GPU and an H2/CO2 selectivity of up to 82, while simplifying the preparation process and reducing costs.

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Abstract

This invention belongs to the technical field of covalent organic framework membrane materials, and provides a covalent organic framework / polyethersulfone hybrid matrix membrane, its preparation method, and its application. The method includes the following steps: mixing polyethersulfone, a solvent, and trialdehyde-based resorcinol to obtain a trialdehyde-based resorcinol solution; coating the trialdehyde-based resorcinol solution onto a glass fiber filter membrane to obtain a trialdehyde-based resorcinol / polyethersulfone membrane; mixing p-phenylenediamine, a catalyst, and water to obtain a p-phenylenediamine solution; and immersing the trialdehyde-based resorcinol / polyethersulfone membrane in the p-phenylenediamine solution to react, thereby obtaining the covalent organic framework / polyethersulfone hybrid matrix membrane. The preparation method of this invention is mild, and the resulting membrane is uniform and stable, fully combining the high flux of the polymer and the CO2 suppression capabilities of the covalent organic framework. 2 The advantages of strong adsorption separation significantly improve the H2O performance of covalent organic framework / polyethersulfone hybrid matrix membranes. 2 Flux and H 2 / CO 2 Selectivity.
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