楠竹水预水解半纤维素溶出动力学的研究

Kinetic Model of Hemicellulose Dissolution during Water Prehydrolysis of Phyllostachys Heterocyclava

以楠竹为原料,在液比1∶10、温度140～170℃、保温时间0～300 min范围内进行了水预水解半纤维素溶出动力学的研究,经数据拟合得到水解反应动力学参数。研究表明,楠竹在140～170℃内,半纤维素水解存在明显的快反应和慢反应,其反应的活化能分别为83.29 kJ/mol和138.79 kJ/mol;温度对水预水解影响很大,在水预水解过程中必须严格控制反应温度,以达到在短时间内去除半纤维素、减少纤维素降解的目的。

Kinetic model of hemicellulose dissolution during water prehydrolysis of phyllostachys heterocyclava under the conditions of temper- ature 140 - 170℃, reaction time of the temperature 0 - 300 min and ratio of liquid to solid 10：1 was studied. All experimental data were fit- ted to get the kinetic parameters. The results showed that the hydrolysis reaction of hemicellulose was clearly divided into fast and slow stages from 140℃ to 170℃, the activation energys were 83.29 kJ/mol and 138.79 kJ/mol respectively. The reaction temperature had significant influence on the water prehydrolysis process, which must be strictly controlled to achieve the purpose of removing hemicellulose in a short time and reducing the degradation of cellulose.