Carbon dioxide separation membrane, method for preparing the same, and use thereof

By introducing CB[7] and a dual-network hydrogel polymer matrix into the mixed matrix membrane, the problems of uneven packing dispersion and interface defects were solved, and a high-efficiency CO2 separation membrane was prepared, achieving high permeability and selective gas separation effect, which is suitable for carbon capture such as biogas upgrading.

CN121648762BActive Publication Date: 2026-06-26DONGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
DONGHUA UNIV
Filing Date
2026-02-06
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing mixed matrix membranes suffer from problems such as uneven packing dispersion, poor interfacial compatibility, and interfacial defects during preparation and application, which makes it difficult to optimize separation performance and limits their large-scale promotion.

Method used

Cucurbita[7]urea (CB[7]) is combined with a dual-network hydrogel polymer matrix and PAMPS/PDMAAm hydrogel is formed by UV light polymerization. The dispersion state of CB[7] in the gel is precisely controlled to form an efficient CO2 transport channel, avoiding filler agglomeration and interface defects.

Benefits of technology

It achieves high CO2 permeability and high CO2/CH4 selectivity, exceeding the Robeson limit in performance, and has excellent long-term stability and pressure tolerance, making it suitable for carbon capture applications such as biogas upgrading.

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Abstract

The present application relates to a kind of carbon dioxide separation membranes and its preparation method and application, the carbon dioxide separation membrane is prepared by cucurbit [7] urea CB [7] and double network hydrogel polymer matrix;The double network hydrogel polymer matrix is formed by the first network monomer and the second network monomer by ultraviolet light polymerization;The first network monomer is 2-acrylamide-2-methylpropane sulfonic acid AMPS;The second network monomer is N,N-dimethyl acrylamide DMAAm.CB [7] inherent nanometer channel and the additional passage formed by its interface with polymer chain in the present application, synergistically build efficient CO2 transport path, while improving the CO2 permeability and CO2 / CH4 selectivity of membrane;Separation membrane preparation method is simple, and performance is stable, has wide application prospect in carbon dioxide separation field such as biogas upgrading.
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