title: Subcritical water hydrolysis of rice straw for reducing sugar production with focus on degradation by-products and kinetic analysis.
abstract: The competitive reactions of reducing sugar production and degradation in the subcritical water hydrolysis of rice straw were investigated to optimise reducing sugar yield. The optimised conditions (280°C, 20 MPa, rice straw concentration of 5 wt.% and agitation speed of 200 rpm) resulted in a reducing sugar yield of 0.346 g/g rice straw because of the enhanced reducing sugar production and decreased sugar degradation. The sugar yield increased when the temperature increased from 250°C to 280°C, but it decreased when the temperature further increased to 300°C because of the degradation of monosaccharides (e.g. glucose and xylose) into by-products (e.g. 2-methyltetrahydrofuran and acetic acid). A first-order reaction model was developed to elucidate the competitive reaction kinetics of sugar production and degradation at various temperatures. The highest reducing sugar yield based on the model was achieved at 280°C with the highest production and lowest degradation rates.
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Richen
authors: R
authors: Lin
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. Electronic address: juncheng@zju.edu.cn.
authors: Jun
authors: J
authors: Cheng
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Lingkan
authors: L
authors: Ding
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; Department of Life Science and Engineering, Jining University, Jining 273155, China.
authors: Wenlu
authors: W
authors: Song
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Feng
authors: F
authors: Qi
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Junhu
authors: J
authors: Zhou
authors: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
authors: Kefa
authors: K
authors: Cen
mesh_terms: D019342:Acetic Acid / Q000378:metabolism; D001673:Biodegradation, Environmental; D002241:Carbohydrates; D005663:Furans / Q000378:metabolism; D005947:Glucose / Q000378:metabolism*; D006868:Hydrolysis; D007700:Kinetics; D012275:Oryza / Q000378:metabolism*; D013696:Temperature; D014866:Waste Products / Q000032:analysis; D014867:Water / Q000378:metabolism*; D014994:Xylose / Q000378:metabolism*
chemical_list: D002241:Carbohydrates; D005663:Furans; D014866:Waste Products; D014867:Water; D014994:Xylose; C550584:2-methyltetrahydrofuran; D005947:Glucose; D019342:Acetic Acid
keywords: Kinetic model; Reducing sugar; Rice straw; Subcritical water hydrolysis