April 16, 2014

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Reaction kinetics of stover liquefaction in recycled stover polyol

Fei Yu1, Roger Ruan1, 2 , Xiangyang Lin2, Yuhuan Liu2, Rong Fu1, Yuhong Li1, Paul Chen1 and Yinyu Gao2

(1) Center for Biorefining and Biosystems and Agricultural Engineering, University of Minnesota, 1390 Eckles Avenue, 55108 St Paul, MN
(2) MOE Key Laboratory of Food Science, Nanchang University, 330047 Jiangxi, China

Abstract The purpose of this research was to study the kinetics of liquefaction of crop residues. The liquefaction of corn stover in the presence of ethylene glycol and ethylene carbonate using sulfuric acid as a catalyst was studied. It was found that the liquefaction yield was a function of ratio of solvent to corn stover, temperature, residence time, and amount of catalyst. Liquefaction of corn stover was conducted over a range of conditions encompassing residence times of 0¨C2.5 h, temperatures of 150¨C170¡ãC, sulfuric acid concentrations of 2¨C4% (w/w), and liquefaction reagent/corn stover ratio of 1¨C3. The liquefaction rate constants for individual sets of conditions were examined using a first-order reaction model. Rate constant increased with the increasing of liquefaction temperature, catalyst content, and liquefaction reagent/corn stover ratio. Reuse of liquefied biomass as liquefying agent was also evaluated. When using recycled liquefied biomass instead of fresh liquefaction reagent, the conversion is reduced. It appeared that 82% of liquefaction yield was achieved after two times of reuse.

Applied Biochemistry and Biotechnology 563 Vol. 129–132, 2006