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Study of in situ 1-butanol pervaporation from A-B-E fermentation using a PDMS composite membrane: Validity of solution-diffusion model for pervaporative A-B-E fermentation

Authors

  • Si-Yu Li,

    1. Dept. of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269
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  • Ranjan Srivastava,

    1. Dept. of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269
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  • Richard S. Parnas

    Corresponding author
    1. Dept. of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269
    2. Institute of Materials Science, University of Connecticut, Storrs, CT 06269
    • Dept. of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269
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Abstract

In this study, the application of a new polydimethylsiloxane (PDMS)/dual support composite membrane was investigated by incorporating the pervaporation process into the A-B-E (acetone-butanol-ethanol) fermentation. The performance of the A-B-E fermentation using the integrated pervaporation/fermentation process showed higher biomass concentrations and higher glucose consumption rates than those of the A-B-E fermentation without pervaporation. The performance of the membrane separation was studied during the separation of 1-butanol from three different 1-butanol solutions: binary, model, and fermentation culture solutions. The solution-diffusion model, specifically the mass transfer equation based on Fick's First Law, was shown to be applicable to the undefined A-B-E fermentation culture solutions. A quantitative comparison of 1-butanol separation from the three different solutions was made by calculating overall mass transfer coefficients of 1-butanol. It was found that the overall mass transfer coefficients during the separation of binary, model, and fermentation culture solutions were 1.50, 1.26, and 1.08 mm/h, respectively. © 2011 American Institute of Chemical Engineers Biotechnol. Prog., 2011

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