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Ability of a perfluoropolymer membrane to tolerate by-products of ethanol fermentation broth from dilute acid-pretreated rice straw

Sasaki, Kengo, Matsuda, Fumio, Hasunuma, Tomohisa, Ogino, Chiaki, Urairi, Masakatsu, Yoshida, Kazuhito, Kondo, Akihiko
Biochemical engineering journal 2013 v.70 pp. 135-139
Saccharomyces cerevisiae, biomass, byproducts, culture media, distillation, ethanol, ethanol fermentation, lignocellulose, rice straw, vapors, yeast extract
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.