Solubility-based gas separation with oligomer-modified inorganic membranes: Part II. Mixed gas permeation of 5 nm alumina membranes modified with octadecyltrichlorosilane

Asad Javaid, David M. Ford

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20 Scopus citations

Abstract

Following the ideas presented in a previous publication [J. Membr. Sci. 187 (2001) 141], hybrid organic/inorganic membranes were prepared by the surface-derivatization of commercially available mesoporous alumina membranes with octadecyltrichlorosilane (OTS). Ideal and mixed gas selectivities for propane/nitrogen and butane/methane systems were obtained at different inlet feed pressures and compositions. The membranes were always selective for the heavier species over the lighter, which is indicative of a solubility-based separation. The mixed gas selectivities were generally greater than or equal to the corresponding ideal values. Interestingly, the dependence of mixed gas selectivity on feed pressure was qualitatively different for the two different gas pairs. Apparent competitive and cooperative effects between the permeating gas species were observed under different conditions. Overall, the permeation characteristics of the hybrids were more consistent with a dense polymeric material rather than a porous one.

Original languageEnglish
Pages (from-to)157-168
Number of pages12
JournalJournal of Membrane Science
Volume215
Issue number1-2
DOIs
StatePublished - Apr 15 2003

Keywords

  • Ceramic membranes
  • Gas and vapor permeation
  • Gas separations
  • Microporous and porous membranes
  • Organic separations

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