纤维乙醇工艺中酸处理稻秸秆反应条件的优化

以木糖含量为指标，在稀酸处理条件中时间、浓度和液固比影响试验结果的基础上，采用二次回归正交设计优化稀酸处理的条件，建立稀酸处理3因素与木糖含量之间的回归方程关系式，通过验证得到方差分析具有显著性。同时得到各因素的主次因素顺序：时间（x1）＞液固比（x2）＞浓度（x3）。并通过回归方程求解得到的稀酸处理秸秆条的最佳工艺参数为：反应时间2 h，稀酸体积分数4.1%、液固比22︰1，此条件下可以求得较为稳定的木糖质量浓度为0.332 g/L。研究中通过采用二次回归正交设计方法，较大程度地减少了试验次数和优化工艺条件，从而为试验研究提供了一定的依据。此外，该试验研究结果表明3因素交互项对试验结果影响不显著，但反应时间和稀酸浓度2因素的水平选择上有待调整。

Optimization on acid pretreatment conditions for rice straw in process of lignocellulosic ethanol

In order to get high xylose yield from the hydrolysis of dilute acid pretreatment straw, the effects of single factor reaction time, solid-liquid rate and concentration to the pretreatment process were investigated. Meanwhile, the treatment conditions were optimized with quadratic regression orthogonal design. The orthogonal design was set up, which was fit to the linear between factors and xylose yield. Variance analysis exhibited a significant difference. Moreover, the order of the factors was as follows: reaction time (x1)> liquid to solid ratio (x2) > concentration of acid (x3). Using the regression equation model, the optimal pretreatment conditions were determined: reaction time 2 h, concentration of acid 4.1%, liquid to solid ratio 22:1. Under the optimal conditions, the xylose yield was 0.332 g/L. The quadratic regression orthogonal design had the advantages of less test times and optimized pretreatment conditions for the basis studies. The results of this study showed that the effects of three interaction items were not significant, but the coded factors of reaction time and acid concentration needed to be adjusted.