School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology of Guangxi, Nanning 530004, China.
Bioresour Technol. 2017 Mar;228:147-155. doi: 10.1016/j.biortech.2016.12.080. Epub 2016 Dec 24.
The aim of present study was to obtain total reducing sugars (TRS) by hydrolysis in subcritical CO-water from sugarcane bagasse pith (SCBP), the fibrous residue remaining after papermaking from sugarcane bagasse. The optimum hydrolysis conditions were evaluated by L(4) orthogonal experiments. The TRS yield achieved 45.8% at the optimal conditions: 200°C, 40min, 500rmin, CO initial pressure of 1MPa and liquid-to-solid ratio of 50:1. Fourier transform infrared spectrometry and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance were used to characterize hydrolysis liquor, treated and untreated SCBP, resulting in the removal of hemicelluloses to mainly produce xylose, glucose and arabinose during hydrolysis. The severity factors had no correlation to TRS yield, indicating that the simple kinetic processes of biomass solubilisation cannot perfectly describe the SCBP hydrolysis. The first-order kinetic model based on consecutive reaction was used to obtain rate constants, activation energies and pre-exponential factors.
本研究旨在从甘蔗渣髓（SCBP）中通过亚临界 CO-水水解获得总还原糖（TRS），SCBP 是制糖后的甘蔗渣纤维残余物。通过 L(4)正交实验评估了最佳水解条件。在最佳条件下（200°C、40min、500rmin、CO 初始压力 1MPa 和液固比 50:1），TRS 收率达到 45.8%。傅里叶变换红外光谱和二维异核单量子相干核磁共振用于对水解液、处理和未处理的 SCBP 进行表征，结果表明在水解过程中半纤维素被去除，主要产生木糖、葡萄糖和阿拉伯糖。严重度因子与 TRS 收率无关，表明生物质溶解的简单动力学过程不能完全描述 SCBP 水解。使用基于连续反应的一级动力学模型获得了速率常数、活化能和指数前因子。
