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Applicability of sub- and supercritical water hydrolysis of woody biomass to produce monomeric sugars for cellulosic bioethanol fermentation

  • Kim, Kwang-Ho (Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University) ;
  • Eom, In-Yong (Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University) ;
  • Lee, Soo-Min (Division of Forest Bioenergy, Korea Forest Research Institute) ;
  • Cho, Sung-Taig (Division of Forest Bioenergy, Korea Forest Research Institute) ;
  • Choi, In-Gyu (Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University) ;
  • Choi, Joon-Weon (Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University)
  • Received : 2010.04.02
  • Accepted : 2010.06.01
  • Published : 2010.11.25

Abstract

In this study two woody biomasses, poplar and pitch pine wood, were treated with sub- and supercritical water (SCW) at temperature of $325-425^{\circ}C$, at pressure of $220{\pm}10$ atm and residence time of 60 s respectively, to develop a time saving and efficient conversion process for the production of fermentable sugars from woody biomasses using supercritical water system. Cellulose/hemicellulose was easily hydrolyzed during SCW treatment into monomeric sugars with the total yield of 7.3% and 8.2% based on the oven dried weight of poplar and pitch pine, respectively. Total yield of the monomeric sugars was increased about threefolds to 23.0% and 25.1% in the presence of 0.05% of hydrochloric acid. Model experiment confirmed that glucose and xylose were readily converted into low molecular weight compounds during SCW hydrolysis. According to GC/MS analysis main compounds converted from glucose and xylose by SCW were identified to 5-hydroxymethyl furfural and 4-oxo-5-methoxy-2-penten-5-olide, respectively.

Keywords

Acknowledgement

Supported by : Korea Research Foundation

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