酸预处理中纤维素聚合度变化的数学模型及对水解效率的影响  

MATHEMATICAL MODEL OF CELLULOSE POLYMERIZATION DEGREE CHANGING AND ITSEFFECTION CELLULOSE HYDROLYSIS EFFICIENCY USING ACID PRETREATMENT

作　　者：李文志[1] 卢文昱[1] 吴昊[1] 刘启予 

机构地区：[1]中国科学技术大学热科学与能源工程系,合肥230027

出　　处：《太阳能学报》2017年第1期72-77,共6页Acta Energiae Solaris Sinica

基　　金：科学院重点部署项目(KGZD-EW-304-2);科学院天然气水合物重点实验室优先资助项目(CX2090130020);国家重点基础研究发展(973)计划(2012CB215302)

摘　　要：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。Using filter paper as the model compound of cellulose, dilute hydrochloricacid pretreatment experiment was carried out to explore the effect of hydrochloricacid concentration, pretreatment temperature and time on cellulose polymerization degree （DP）change. Meanwhile, the effect of DP changing on sugar yield of cellulose hydrolysiswas also investigated. A mathematical model of DP changed with hydrochloricacid concentration, pretreatment temperature, time was established through nonlinear regression. The impact of the three variables was demonstrated through analyzing the mathematical model. The results indicated that DP decreases from 1088 to 120 after acid pretreatment, and it followed the model as DP：1088-23.5C-20.67T-7.8t＋1.71CT＋0.56Ct-13.24n＋4.32C^2＋0.02T^2＋0.51t^2. What＇s more, a lower cellulose DP is corresponding to a higher glucose yield, the yield of glucose increased from 9.2% to 14.5% after acid treatment.

关 键 词：纤维素水解 预处理 非线性回归 糖产率 

分 类 号：TK6[动力工程及工程热物理—生物能]