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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Sulfur-Functionalized Hyper-Cross-Linked Carbon Molecular Sieve Membranes with Enhanced Ethylene/Ethane Separation

Shuang Zhang1, Yongchao Sun1, Lu Bai1

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 1, 2026
PubMed
Summary

Researchers developed high-performance carbon molecular sieve (CMS) membranes for ethylene/ethane separation. This novel hyper-cross-linked strategy significantly enhances both ethylene permeability and selectivity, surpassing previous upper bounds for industrial applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Technology

Background:

  • Carbon molecular sieve (CMS) membranes show potential for ethylene/ethane separation.
  • Achieving high ethylene permeability and selectivity simultaneously in CMS membranes is a significant challenge.
  • Existing methods often struggle to balance permeability and selectivity for efficient olefin/paraffin separation.

Purpose of the Study:

  • To develop high-performance CMS membranes for enhanced ethylene/ethane separation.
  • To investigate a hyper-cross-linked strategy to improve CMS membrane properties.
  • To overcome the trade-off between permeability and selectivity in membrane-based separations.

Main Methods:

  • Fabrication of CMS membranes using a hyper-cross-linked strategy via Friedel-Crafts alkylation of a sulfone-containing polyimide (6FDH).
  • Controlled pyrolysis of the modified polyimide precursor.
  • Characterization of membrane structure, pore size distribution, and separation performance.

Main Results:

  • The hyper-cross-linked network and sulfur units enhance molecular sieving and ethylene permeability.
  • Decomposition of methylene bridges increases micropore volume, boosting ethylene permeability.
  • Optimized 6FDH-X CMS-800 membrane achieved a selectivity of 11.2 and permeability of 140.3 barrer for ethylene/ethane.
  • The performance surpasses the upper bounds for state-of-the-art polymeric and CMS membranes.

Conclusions:

  • The developed hyper-cross-linked strategy offers a viable pathway for high-performance CMS membranes.
  • This approach enables concurrent improvements in permeability and selectivity for ethylene/ethane separation.
  • The findings provide a promising solution for industrial olefin/paraffin separation challenges.