High-strength high-separation-performance carbon molecular sieve hollow fiber membrane, and preparation method and application thereof

By adding cellulose acetate and ionic liquid to the casting solution, a high-strength, high-separation-performance carbon molecular sieve hollow fiber membrane was prepared, solving the problems of insufficient strength and low permeability of existing membrane materials in the process of natural gas helium extraction, and realizing efficient helium separation.

CN117531380BActive Publication Date: 2026-06-26EAST CHINA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EAST CHINA UNIV OF SCI & TECH
Filing Date
2023-12-04
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing carbon molecular sieve hollow fiber membranes have insufficient strength and low permeability in the process of natural gas helium extraction, and cannot meet the requirements of industrial helium extraction.

Method used

Hollow fiber cellulose acetate membranes were prepared by adding cellulose acetate and ionic liquid to the casting solution and using a wet-dry spinning method. The membranes were then heated and carbonized under a protective atmosphere to prepare high-strength carbon molecular sieve hollow fiber membranes with high separation performance.

Benefits of technology

It improves the membrane's strength and permeability, enabling it to maintain good separation performance under high pressure, extend its service life, and improve helium extraction efficiency and resource utilization.

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Abstract

The application relates to a high-strength high-separation-performance carbon molecular sieve hollow fiber membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing cellulose acetate, cellulose, an organic solvent and an ionic liquid to prepare a casting solution, and stirring and heating the casting solution; (2) vacuumizing and defoaming the casting solution, and preparing a hollow fiber cellulose acetate membrane by using a dry-wet spinning method; and (3) drying the hollow fiber cellulose acetate membrane, and preparing the high-strength high-separation-performance carbon molecular sieve hollow fiber membrane by carbonizing under temperature rise in a protective atmosphere. Compared with the prior art, the carbon molecular sieve hollow fiber membrane has good gas separation performance and high strength. The carbon molecular sieve membrane is used for He / CH4 separation, has high He permeation performance and a high He / CH4 separation factor, has good gas separation performance under high pressure, and provides a new choice for natural gas helium extraction membrane materials.
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