低分子量聚己二酸乙二醇酯制备过程中的缩聚反应动力学  

Reaction Kinetics of Polycondensation Process of Low Molecular Weight Poly (ethylene adipate)

作　　者：奚桢浩[1] 陈礼科[1] 潘珣[1] 赵玲[1] 袁渭康[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化学反应工程与工艺》2014年第2期97-101,共5页Chemical Reaction Engineering and Technology

基　　金：国家重点基础研究计划(973计划)(2009CB623501);上海市启明星计划项目(10QB1404700)

摘　　要：以己二酸和乙二醇为原料、经酯化及缩聚过程合成的数均分子量1000-4000聚己二酸乙二醇酯（PEA）是生产聚氨酯的主要原料之一。实验考察了制备低分子量PEA的缩聚过程中催化剂种类、催化剂用量、反应温度等对合成的 PEA 羧基浓度、分子量等的影响。结果发现钛酸异丙酯催化活性最好，其较佳用量为25-50 mg/kg，较佳的反应温度为220~250℃。建立了基于有外加催化剂存在下酯化和缩聚反应均为2级反应的动力学模型，并根据不同反应温度、催化剂用量时的动力学实验数据，利用遗传算法得到了低分子量PEA合成缩聚过程反应动力学参数，模型计算值和实验值的相对误差在9%之内。Poly （ethylene adipate） （PEA） with the number average molecular weight of 1 000-4 000 is one of main raw materials for producing polyurethane, which is manufactured with ethylene glycol （EG） and adipic acid （AA）. The effects of different kinds of catalyst, the catalyst dosage and reaction temperature on the concentration of carboxyl, molecular weight in polycondensation process of producing the low molecular weight PEA were investigated experimentally. The results showed that tetraisopropyl titanate （TPT） had the optimal catalytic activity with the dosage of 25-50 mg/kg, while the proper range of reaction temperature were 220-250 ℃. Based on batch experiments and the second-order kinetic model in the present of additional catalysts for esterification and polycondensation reactions, the kinetic parameters of polycondensation process for PEA were estimated by genetic algorithm, and the average relative error between calculated and experimental values was less than 9%.

关 键 词：聚己二酸乙二醇酯 缩聚 动力学 低分子量 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]