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

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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