Recovery of butanol from model solutions and fermentation broth using a silicalite/silicone membrane

N. Qureshi, M. M. Meagher, R. W. Hutkins

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

A silcone-silicalite-1 composite membrane was synthesized to recover acetone, butanol, and ethanol (ABE) from model solutions and the Clostridium acetobutylicum (ABE) fermentation broth. The adsorption capacity of the silicalite-1 in the presence of a mixture of acetone, butanol and ethanol were 8-12, 85-90 and <5mg/g, respectively. There was no apparent difference of absorption rate of butanol at 36°C and 79°C and desorption of butanol occurred efficiently at 78°C and 1-3Torr. The silicalite-1 was characterized by chemical analysis, NMR, electron micrographs, surface area and pore size determination and found to have identical properties to other silicalite-1 reported in the literature. The silicalite-1 was incorporated into a silicone membrane in an effort to enhance butanol flux and selectivity. A membrane with a silicalite-1 to polymer ratio of 1.5:1 (g:g) (306μm thick) had butanol selectivities of 100-108 and a flux of 89g/m2h at feed butanol concentrations ranging from 5 to 9g/l and a retentate temperature of 78°C. A 170μm silicone membrane under identical conditions had selectivity and flux of 30 and 84g/m2h, respectively. A thin silicalite membrane offered low selectivity and high flux, while a thick membrane offered high selectivity and low flux. The effect of butanol concentration (0.37-78g/l) on flux and selectivity was also studied. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)115-125
Number of pages11
JournalJournal of Membrane Science
Volume158
Issue number1-2
DOIs
StatePublished - Jun 1 1999

Keywords

  • Butanol
  • Pervaporation
  • Silicone-silicalite membrane

ASJC Scopus subject areas

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

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