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为了高效利用棉花秸秆制备燃料乙醇,用稀酸法对棉花秸秆进行预处理。通过单因素试验和二次正交旋转组合设计分析,建立处理温度、时间、硫酸体积分数试验因素与木糖含量之间的回归模型,优化工艺条件。结果表明,回归模型高度显著,R2=0.9251,模型具有预测意义。各试验因素影响主次顺序为硫酸体积分数、处理时间、处理温度,稀酸预处理棉花秸秆的优化条件为处理温度133.5℃、时间2.0h、硫酸体积分数3.5%,此条件下滤液中木糖浓度达6.865g/L。通过对处理前后棉花秸秆纤维结构的SEM图观察,表明稀酸预处理可有效打破木质纤维素的结晶结构,降低木质素的束缚作用。
In order to make efficient use of cotton stalks to prepare fuel ethanol, cotton stalks were pretreated with dilute acid method. Through the single factor experiment and the quadratic orthogonal rotation combination design and analysis, the regression model between the experimental factors of temperature, time, the volume fraction of sulfuric acid and the content of xylose was established and the process conditions were optimized. The results show that the regression model is highly significant, R2 = 0.9251, the model has predictive significance. The main factors affecting the order of the experimental factors for the volume fraction of sulfuric acid, the treatment time, the treatment temperature, the optimum conditions for dilute acid pretreatment of cotton straw for the treatment temperature 133.5 ℃, time 2.0h, sulfuric acid volume fraction 3.5%, under these conditions filtrate xylose The concentration of 6.865g / L. Through the SEM observation of the fiber structure of cotton stalks before and after treatment, it shows that dilute acid pretreatment can effectively break the crystal structure of lignocellulose and reduce the binding effect of lignin.