Hydrocarbon/hydrogen mixed-gas permeation properties of PIM-1, an amorphous microporous spirobisindane polymer

Sylvie Thomas, Ingo Pinnau*, Naiying Du, Michael D. Guiver

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations


The gas permeation properties of the microporous glassy ladder polymer PIM-1 are reported for hydrocarbon/hydrogen mixtures. PIM-1 is more permeable to hydrocarbon vapors than to hydrogen, a behavior similar to that of the microporous linear-chain poly(1-trimethylsilyl-1-propyne) [PTMSP]. For a 2 vol.% n-butane/98 vol.% hydrogen feed mixture, PIM-1 has a mixed-gas n-butane permeability of 4000 Barrer combined with an n-butane/hydrogen selectivity of 27. An increase in n-butane feed concentration leads to an increase in n-butane permeability, but has only a minor effect on the hydrogen permeability. As a result, the n-butane/hydrogen selectivity increases from 27 to 51 as the feed n-butane concentration increases from 2 to 7.3 vol.%. Because of its excellent mixed-gas hydrocarbon/hydrogen selectivity and high permeability, PIM-1 could find use as a novel membrane material in petrochemical applications, such as hydrogen recovery from fluid catalytic cracker off-gases. Crown

Original languageEnglish (US)
Pages (from-to)1-4
Number of pages4
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Aug 10 2009


  • Hydrocarbons
  • Hydrogen
  • Microporous polymer
  • Mixed-gas transport
  • PIM

ASJC Scopus subject areas

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


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