纤维素衍生物酸性水解的动力学研究  

Kinetic Study of Acid Hydrolysis of Substituted Cellulose

作　　者：母炳男[1,2] 陈睿文[1,2] 杨一奇[1,2] 

机构地区：[1]东华大学生态纺织教育部重点实验室,上海210620 [2]东华大学化学化工与生物工程学院,上海210620

出　　处：《纤维素科学与技术》2015年第2期19-26,共8页Journal of Cellulose Science and Technology

摘　　要：研究了取代基对纤维素水解动力学的影响,纤维素酸性水解速率的大小直接决定纤维素材料的可用性以及纤维素转化成糖的效率,纤维素衍生物由于其特有的化学非均相性,水解动力学很少有人研究。本文量化了取代基效应、p H、温度对纤维素衍生物水解速率的影响;活性红120取代的纤维素二糖酸性水解反应速率为5.0×10-3 h-1,是未取代双糖速率的190倍,反应活化能较未取代的低10 k J/mol,并且发现被取代的纤维素二糖对质子更加敏感;最终基于反应的非均相性,建立了一个包含多种因素的水解动力学模型。这个模型对今后研究取代基催化纤维素水解的机理提供了帮助。The substituent effect on the kinetics of cellulose hydrolysis was investigated in the present paper. The value of hydrolysis rate determined not only the durability of cellulosic materials but also the conversion efficiency from cellulose to glucose. Few studied the kinetic of cellulose derivatives due to their chemical heterogeneity. The effects of substitution, pH, temperature and degree of crystallinity were quantified. The reaction rate of substituted cellobiose by reactive red 120 was 5.0 × 10^-3 h^-1, which was 190 folded faster than that of unsubstituted. The activation energy of substituted cellobiose was 10 kJ/mol lower than that of unsubstituted one. And the substituted cellobiose was more sensitive to proton. Base on the chemical heterogeneity, a model integrating several factors was developed. This model could provide assistance when studying the mechanism why substituent accelerated the hydrolysis rate.

关 键 词：纤维素衍生物 取代基效应 动力学模型 聚合度 取代度 

分 类 号：TS195.5[轻工技术与工程—纺织化学与染整工程]