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采用响应面法对纤维素超低酸水解工艺进行优化研究。以温度、时间、酸浓度和液固比4个因素,根据中心因子复合原则设计31组试验。对试验结果进行二次回归分析,得到响应面模型,相关系数R2=0.8284。方差分析结果表明因素的显著性依次为:温度>液固比>时间>酸浓度。绘制的三维图形均带有明显的凸面,表明最佳工况在本试验设计的水平范围之内。优化结果表明在温度205℃,液固比15.72,酸浓度0.15%,时间33min时获得最大糖浓度为22.35g/L。该条件下,实际试验值为18.75±0.13g/L,与预测值吻合较好。
Optimization of cellulose ultra-low acid hydrolysis by response surface methodology. Based on the four factors of temperature, time, acid concentration and liquid-solid ratio, 31 sets of experiments were designed according to the composite principle of central factor. The results of the second regression analysis of the response surface model, the correlation coefficient R2 = 0.8284. Analysis of variance showed that the significant factors were: temperature> liquid-solid ratio> time> acid concentration. The three-dimensional figures were drawn with a clear convex surface, indicating that the best working conditions were within the experimental design level. The results showed that the maximum concentration of glucose was 22.35g / L at the temperature of 205 ℃, liquid-solid ratio of 15.72, acid concentration of 0.15% and time of 33min. Under this condition, the actual test value is 18.75 ± 0.13g / L, which is in good agreement with the predicted value.