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以滤纸作为纤维素模型物,探究稀盐酸预处理过程中稀盐酸浓度、预处理温度、预处理时间对纤维素聚合度的影响及改变聚合度对纤维素水解制备葡萄糖效率的影响。研究结果表明:预处理初期纤维素聚合度快速地由1088降低到小于300,随着预处理条件的进一步加强,纤维素聚合度缓慢地降至约120;随着聚合度从1088降低到120,葡萄糖产率由9.2%增大至约14.5%。利用非线性回归方法,建立以稀盐酸浓度、反应温度、反应时间为变量的纤维素聚合度(DP)变化的数学模型,DP=1088-23.5C-20.67T-7.8t+1.71CT+0.56Ct-13.24Tt+4.32C~2+0.02T~2+0.51t~2,分析3个变量对纤维素聚合度变化的影响。
The effect of dilute hydrochloric acid concentration, pretreatment temperature and pretreatment time on the degree of polymerization of cellulose and the effect of polymerization degree on the conversion of glucose to cellulose by cellulose hydrolysis were investigated by using filter paper as cellulose model. The results showed that the degree of polymerization of cellulose decreased rapidly from 1088 to less than 300 at the initial stage of pretreatment. With the further pretreatment, the degree of polymerization of cellulose decreased slowly to about 120. With the degree of polymerization decreased from 1088 to 120, The glucose yield increased from 9.2% to about 14.5%. Using nonlinear regression method, the mathematical model of change of degree of polymerization (DP) of cellulose with dilute hydrochloric acid concentration, reaction temperature and reaction time was established. DP = 1088-23.5C-20.67T-7.8t + 1.71CT + 0.56Ct -13.24Tt + 4.32C ~ 2 + 0.02T ~ 2 + 0.51t ~ 2, the influence of three variables on the degree of cellulose polymerization was analyzed.