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›› 2008, Vol. 8 ›› Issue (6): 1132-1137.

• 过程与工艺 • 上一篇    下一篇

Degradation Kinetics of Xylose and Glucose in Hydrolysate Containing Dilute Sulfuric Acid

亓伟 张素平 许庆利 任铮伟 颜涌捷   

  1. 华东理工大学生物质能研究中心 华东理工大学能源化工系 华东理工大学生物质能研究中心 华东理工大学能源化工系
  • 收稿日期:2008-08-22 修回日期:2008-10-24 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 颜涌捷

Degradation Kinetics of Xylose and Glucose in Hydrolysate Containing Dilute Sulfuric Acid

QI Wei ZHANG Su-ping XU Qing-li REN Zhen-wei YAN Yong-jie   

  1. Center for Biomass Energy Technology, East China University of Science and Technology Dept. Chem. Technol. Energy Resources, East China Univ. Sci. & Technol., Center for Biomass Energy Technology, East China University of Science and Technology Dept. Chem. Technol. for Energy Source, East China Univ. Sci. & Technol.,
  • Received:2008-08-22 Revised:2008-10-24 Online:2008-12-20 Published:2008-12-20
  • Contact: YAN Yong-jie

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摘要： In preparation of fuel alcohol from biomass as feedstock, hydrolysis with dilute acid as catalyst is one way to produce fermentable saccharide, xylose and glucose. However, the acid is also the catalyst in degradation of xylose and glucose and the yield of sacchride is dependent on the kinetic behaviors of saccharide. The degradation kinetics of xylose and glucose in the hydrolysate was investigated under the conventional process conditions of hydrogen ion concentration from 0.05 to 0.2 mol/L and temperature from 150 to 200℃. With a numerical calculation method, the kinetic parameters were estimated, and the activation energy of xylose and glucose in the degradation reaction was obtained. The kinetic equations correlating the effect of hydrogen ion concentration on the rate constants of degradation reaction were established. Comparison between the calculated results from the equations and experimental ones proved that the established kinetic model could satisfactorily predict the degradation behavior of xylose and glucose in the acidic hydrolysate.

关键词: biomass, dilute sulfuric acid, xylose, glucose, kinetic behavior

Abstract: In preparation of fuel alcohol from biomass as feedstock, hydrolysis with dilute acid as catalyst is one way to produce fermentable saccharide, xylose and glucose. However, the acid is also the catalyst in degradation of xylose and glucose and the yield of sacchride is dependent on the kinetic behaviors of saccharide. The degradation kinetics of xylose and glucose in the hydrolysate was investigated under the conventional process conditions of hydrogen ion concentration from 0.05 to 0.2 mol/L and temperature from 150 to 200℃. With a numerical calculation method, the kinetic parameters were estimated, and the activation energy of xylose and glucose in the degradation reaction was obtained. The kinetic equations correlating the effect of hydrogen ion concentration on the rate constants of degradation reaction were established. Comparison between the calculated results from the equations and experimental ones proved that the established kinetic model could satisfactorily predict the degradation behavior of xylose and glucose in the acidic hydrolysate.

Key words: biomass, dilute sulfuric acid, xylose, glucose, kinetic behavior