Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Bioresour Technol. 2012 Feb;105:160-8. doi: 10.1016/j.biortech.2011.11.075. Epub 2011 Nov 28.
Sugarcane bagasse was hydrolyzed with 0.4-5 wt.% sulfuric acid at 97-126 °C. 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 (R(2)) in the range of 0.95-0.995) to describe the kinetic behavior of dilute acid hydrolysis of sugarcane bagasse.
甘蔗渣用 0.4-5wt.%硫酸在 97-126°C 水解。提出了一个新的动力学模型来描述聚糖的溶解和单糖的形成。基于植物细胞壁的多层结构，将“潜在水解度”（h(d)）的概念引入到生物质聚糖水解的动力学模型中。研究发现，在木聚糖水解过程中，木二糖寡糖显然存在于液相中，特别是在低温下。因此，为了准确确定木聚糖水解的速率常数，应测量固相中的残留木聚糖含量、液相中的木二糖寡糖和木糖浓度。同样，“潜在水解度”的概念适用于阿拉伯聚糖和纤维素的水解。根据实验数据确定了速率常数或 h(d)与反应剧烈程度（稀酸浓度和温度）之间的动力学关系。结果表明，该模型可靠（决定系数（R(2)）在 0.95-0.995 范围内），能够描述甘蔗渣稀酸水解的动力学行为。
