Zeolite Beta membranes for the separation of hexane isomers

Patrick S. Bárcia*, Alexandre Ferreira, Jorge Gascon Sabate, Sonia Aguado, José A.C. Silva, Alírio E. Rodrigues, Freek Kapteijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The preparation of α-alumina supported zeolite Beta membranes was successfully achieved and sped up by exploring combinations of three seeding techniques and three synthetic methods. The surface of the membranes was completely covered by well intergrown crystals; the thickness of the zeolite layers ranged from 2 to 6 μm depending on the synthesis method used. The quality of the membranes was tested by means of pervaporation of ethanol/1,3,5-triisopropylbenzene (TIPB) mixtures together with permporometry experiments. The performance in the vapour separation of quaternary equimolar mixtures of n-hexane (nHEX), 3-methylpentane (3MP), 2,3-dimethylbutane (23DMB) and 2,2-dimethylbutane (22DMB) in the range 343-443 K showed that permeate flux decreases as the branching degree increases following the order: nHEX ≫ 3MP > 23DMB > 22DMB. In the retentate, the fractions of monobranched and normal hexane decrease while the concentration of dibranched isomers is increased compared to the feed composition. The influence of the temperature in the permeation fluxes indicates the existence of an activated transport mechanism which favours the permeation of more nHEX and 3MP with regard to their dibranched isomers. The octane number (ON) of the quaternary mixture was enhanced up to 5 points with the best synthesized membrane.

Original languageEnglish (US)
Pages (from-to)194-202
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume128
Issue number1-3
DOIs
StatePublished - Mar 1 2010

Keywords

  • Branched hexane
  • Mixture permeation
  • Separation factor
  • Vapour permeation
  • Zeolite Beta membranes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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