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

作者：Sasaki Kengo; Matsuda Fumio; Hasunuma Tomohisa; Ogino Chiaki; Urairi Masakatsu; Yoshida Kazuhito; Kondo Akihiko^*

来源：Biochemical Engineering Journal, 2013, 70: 135-139.

DOI：10.1016/j.bej.2012.10.013

• Ethanol
• Fermentation
• Vapor permeation
• Bioconversion
• Rice straw
• Perfluoropolymer membrane

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 (90 wt%) in water, to which individual by-products (0.1-2 g/L) were added, the PFP membrane demonstrated no clear change in permeation rate (439-507 g m(-2) h(-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 (751-859 g m(-2) h(-1)) or separation factor (12.5-13.8) while feeding the mixture (final ethanol conc.: 61 wt%) of ethanol and distillation of the fermentation broth using a suspended fraction of dilute acid-pretreated rice straw for 20 h. These results suggest that the PFP membrane can tolerate actual distillation liquids from ethanol fermentation broth obtained from lignocellulosic biomass pretreated with dilute acid.

• 出版日期2013-1-15