Adsorbent filled membranes for gas separation: Part 1. Improvement of the gas separation properties of polymeric membranes by incorporation of microporous adsorbents

J.-M. Duval, B. Folkers, M.H.V. Mulder, C.A. Smolders, G. Desgrandchamps

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Abstract

The effect of the introduction of specific adsorbents on the gas separation properties of polymeric membranes has been studied. For this purpose both carbon molecular sieves and zeolites are considered. The results show that zeolites such as silicate-1, 13X and KY improve to a large extent the separation properties of poorly selective rubbery polymers towards a mixture of carbon dioxide/methane. Some of the filled rubbery polymers achieve intrinsic separation properties comparable to cellulose acetate, polysulfone or polyethersulfone. However, zeolite 5A leads to a decrease in permeability and an unchanged selectivity. This is due to the impermeable character of these particles, i.e. carbon dioxide molecules cannot diffuse through the porous structure under the conditions applied. Using silicate-1 also results in an improvement of the oxygen/nitrogen separation properties which is mainly due to a kinetic effect. Carbon molecular sieves do not improve the separation performances or only to a very small extent. This is caused by a mainly dead-end (not interconnected) porous structure which is inherent to their manufacturing process.
Original languageEnglish
Pages (from-to)189-198
JournalJournal of membrane science
Volume80
Issue number1
DOIs
Publication statusPublished - 1993
EventInternational Conference on Engineering of Membrane Processes 1992 - Garmisch-Partenkirchen, Germany
Duration: 13 May 199215 May 1992

Keywords

  • Gas separation
  • Zeolite membranes
  • Carbon molecular sieves
  • Composite membranes

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