Kinetic model for glycan hydrolysis and formation of monosaccharides during dilute acid hydrolysis of sugarcane bagasse

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• 作者：Xuebing Zhao^a ; ^{zhaoxb@mail.tsinghua.edu.cn} ; Yujie Zhou^b ; Dehua Liu^a ; ^{dhliu@tsinghua.edu.cn}
• 关键词：Lignocellulose ; Dilute acid hydrolysis ; Kinetic model ; Potential hydrolysis degree ; Glycan solubilization
• 刊名：Bioresource Technology
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：105
• 期：Complete
• 页码：160-168
• 全文大小：1185 K

文摘

Sugarcane bagasse was hydrolyzed with 0.4-5 wt. % sulfuric acid at 97-126 ¡ãC. A novel kinetic model was proposed to describe glycan solubilization and formation of monosaccharides. Based on the multilayered structure of plant cell wall, the concept of ¡°potential hydrolysis degree?(h_d)? was introduced into kinetic models for the hydrolysis of biomass glycans. It was found that during xylan hydrolysis, xylo-oligomers were apparently present in the liquid phase, particularly at low temperature. Therefore, to accurately determine the rate constants of xylan hydrolysis, residual xylan content in the solid phase, xylo-oligomers and xylose concentrations in liquid phase should be measured. Similarly, the concept of ¡°potential hydrolysis degree?was applicable for araban and cellulose hydrolysis. The kinetic relationships between rate constant or h_d and reaction severity (dilute acid concentration and temperature) were determined according to experimental data. The results showed that the model was reliable (determination coefficients (R²) in the range of 0.95-0.995) to describe the kinetic behavior of dilute acid hydrolysis of sugarcane bagasse.