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Sasaki K.,Kobe University | Matsuda F.,Kobe University | Hasunuma T.,Kobe University | Ogino C.,Kobe University | And 3 more authors.
Biochemical Engineering Journal | Year: 2013

A perfluoropolymer (PFP) membrane has been prepared for use in vapor permeation to separate aqueous ethanol mixtures produced from rice straw with xylose-assimilating recombinant Saccharomyces cerevisiae. PFP membranes commonly have been used for dehydration process and possess good selectivity and high permeances. The effects of by-products during dilute acid pretreatment, addition of yeast extract, and ethanol fermentation on PFP membrane performance were investigated. While feeding mixtures of ethanol (90wt%) in water, to which individual by-products (0.1-2g/L) were added, the PFP membrane demonstrated no clear change in permeation rate (439-507gm-2h-1) or separation factor (14.9-23.5) from 2 to 4h of the process. The PFP membrane also showed no clear change in permeation rate (751-859gm-2h-1) or separation factor (12.5-13.8) while feeding the mixture (final ethanol conc.: 61wt%) of ethanol and distillation of the fermentation broth using a suspended fraction of dilute acid-pretreated rice straw for 20h. These results suggest that the PFP membrane can tolerate actual distillation liquids from ethanol fermentation broth obtained from lignocellulosic biomass pretreated with dilute acid. © 2012. Source

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