Formation of high-performance 6FDA-2,6-DAT asymmetric composite hollow fiber membranes for CO2/CH4 separation

Chun Cao, Rong Wang, Tai Shung Chung*, Ye Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


We report that 6FDA-2,6-DAT polyimide can be used to fabricate hollow fiber membranes with excellent performances for CO2/CH4 separation. In order to simplify the hollow fiber fabrication process and verify the feasibility of 6FDA-2,6-DAT hollow fiber membranes for CO2/CH4 separation, a new one-polymer and one-solvent spinning system (6FDA-2,6-DAT/N-methyl-pyrrolidone (NMP)) with much simpler processing conditions has been developed and the separation performance of newly developed 6FDA-2,6-DAT hollow fiber membranes has been further studied under the pure and mixed gas systems. Experimental results reveal that 6FDA-2,6-DAT asymmetric composite hollow fiber membranes have a strong tendency to be plasticized by CO2 and suffer severely physical aging with an initial CO2 permeance of 300GPU drifting to 76GPU at the steady state. However, the 6FDA-2,6-DAT asymmetric composite hollow fibers still present impressive ultimate stabilized performance with a CO2/CH4 selectivity of 40 and a CO2 permeance of 59GPU under mixed gas tests. These results manifest that 6FDA-2,6-DAT polyimide is one of promising membrane material candidates for CO2/CH4 separation application.

Original languageEnglish (US)
Pages (from-to)309-319
Number of pages11
JournalJournal of Membrane Science
Issue number1
StatePublished - Nov 1 2002
Externally publishedYes


  • 6FDA-2,6-DAT polyimide
  • CO/CH separation
  • Hollow fiber formation
  • Mixed gas permeation

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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