C2 and C3 hydrocarbon separations in poly(1,5-naphthalene-2,2′-bis(3,4-phthalic) hexafluoropropane) diimide (6FDA-1,5-NDA) dense membranes

Sun Sun Chan, Rong Wang, Tai Shung Chung*, Ye Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The transport of olefin and paraffin namely ethane, ethylene, propane and propylene in aromatic poly(1,5-naphthalene-2,2′-bis(3,4-phthalic) hexafluoropropane) diimide (6FDA-1,5-NDA) dense membranes was investigated. The gas permeability coefficients were measured at pressures from 2.5 to 16atm for the C2 hydrocarbon gases and pressures up to 8.4atm for C3 systems at 35°C. This membrane exhibits permeabilities of 0.15, 0.87, 0.023 and 0.24 Barrer with respect to pure ethane, ethylene, propane and propylene, and shows an ideal selectivity of 5.8 for the separation of ethylene/ethane, 10 for propylene/propane, 7.6 for nitrogen/ethane and 50 for nitrogen/propane. The olefins showed a preferred permeability to paraffins and discussion were drawn to the permeability, diffusivity and solubility coefficients. The activation energies of permeation, diffusion and solution were also reported and the effect of temperature on the permeation properties was discussed for the pure gas permeability data obtained from 30 to 50°C. The plasticisation effect was also found for propane and propylene, respectively, although it was neither detected in the saturated nor unsaturated C2 hydrocarbons at pressures up to 16atm.

Original languageEnglish (US)
Pages (from-to)55-64
Number of pages10
JournalJournal of Membrane Science
Issue number1
StatePublished - Dec 1 2002

Bibliographical note

Funding Information:
The authors would like to thank NUS because part of this project is funded by NUS with the grant number of R-279-000-108-112. Special thanks are due to professor D.R. Paul at University of Texas for his valuable suggestions on permeation tests and to the reviewers for their useful comments.


  • 6FDA-1,5-NDA polyimide
  • Membrane separation
  • Olefin
  • Paraffin
  • Permeation

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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