丙酸预处理小麦秸秆的纤维素水解动力学

Kinetics Hydrolysis of Cellulose of Wheat Straw Pretreated with Propionic Acid

利用丙酸法预处理小麦秸秆,测定了不同温度下反应产物中葡萄糖质量浓度,并根据Saeman模型,计算得到了纤维素水解和葡萄糖降解的动力学数据,其活化能分别为6.508 6×104J/mol和5.622 3×104J/mol。动力学分析表明:纤维素水解反应速度快,但是生成的葡萄糖容易发生降解;该模型的最优化反应条件为80℃和176 min,实验得到的葡萄糖质量浓度为8.89 g/L,与模型预测结果偏差很小。

The cellulose from wheat straw was pretreated with propionic acid, and the content of glucose at different reaction temperatures was determined. Based on the Saeman model, the kinetics data of cellulose hydrolysis and glucose degradation were calculated. The activation energy was 6. 508 6 × 104 J/mol and 5. 622 3 × 104 J/mol, respectively. The analysis results indicated that cellulose has a faster hydrolysis rate, and the glucose formed is easy to degrade. The optimum reaction conditions are 80℃ and 176 min, and the content of glucose reached 8.89 g/L. The adequacy of the model for predicting is verified effectively by the validation.