Zhuang Xinshu, Yuan Zhenhong, Ma Longlong, Wu Chuangzhi, Xu Mingzhong, Xu Jingliang, Zhu Shunni, Qi Wei
Guangzhou Institute of Energy Conversion, Key Laboratory of Renewable Energy and Gas Hydrate, CAS, Guangzhou, 510640 China.
Biotechnol Adv. 2009 Sep-Oct;27(5):578-82. doi: 10.1016/j.biotechadv.2009.04.019. Epub 2009 May 3.
We investigated the kinetics of hot liquid water (HLW) hydrolysis over a 60-min period using a self-designed setup. The reaction was performed within the range 160-220 degrees C, under reaction conditions of 4.0 MPa, a 1:20 solid:liquid ratio (g/mL), at 500 rpm stirring speed. Xylan was chosen as a model compound for hemicelluloses, and two kinds of agricultural wastes-rice straw and palm shell-were used as typical feedstocks representative of herbaceous and woody biomasses, respectively. The hydrolysis reactions for the three kinds of materials followed a first-order sequential kinetic model, and the hydrolysis activation energies were 65.58 kJ/mol for xylan, 68.76 kJ/mol for rice straw, and 95.19 kJ/mol for palm shell. The activation energies of sugar degradation were 147.21 kJ/mol for xylan, 47.08 kJ/mol for rice straw and 79.74 kJ/mol for palm shell. These differences may be due to differences in the composition and construction of the three kinds of materials. In order to reduce the decomposition of sugars, the hydrolysis time of biomasses such as rice straw and palm shell should be strictly controlled.
我们使用自行设计的装置，研究了热液态水（HLW）在60分钟内的水解动力学。反应在160 - 220℃范围内进行，反应条件为4.0MPa、固液比1:20（g/mL）、搅拌速度500rpm。选择木聚糖作为半纤维素的模型化合物，并分别使用两种农业废弃物——稻草和棕榈壳——作为草本和木质生物质的典型原料。三种材料的水解反应遵循一级连续动力学模型，木聚糖的水解活化能为65.58kJ/mol，稻草为68.76kJ/mol，棕榈壳为95.19kJ/mol。木聚糖的糖降解活化能为147.21kJ/mol，稻草为47.08kJ/mol，棕榈壳为79.74kJ/mol。这些差异可能是由于三种材料的组成和结构不同。为了减少糖的分解，应严格控制稻草和棕榈壳等生物质的水解时间。
