规模化聚对苯二甲酸乙二醇酯终缩聚的流程模拟  

Modeling of an Industrial Polycondensation Process for Polyethylene Terephthalate

作　　者：李文艳[1] 顾雪萍[1] 王嘉骏[1] 冯连芳[1] 

机构地区：[1]浙江大学化学工程与生物工程学系化学工程联合国家重点实验室,浙江杭州310027

出　　处：《石油化工》2011年第10期1094-1099,共6页Petrochemical Technology

基　　金：国家科技支撑项目(2007BAE28B04)

摘　　要：归纳了目前已报道的关于聚对苯二甲酸乙二醇酯(PET)终缩聚的动力学机理及参数、传质机理及参数,建立了相应的数学模型;考察了缩聚、醇解、酯化、水解、热裂解、二甘醇和乙醛生成反应的速率常数和传质因子对PET终缩聚的影响;采用工厂的实际数据对模型进行了修正。结果表明,缩聚、醇解、热裂解反应的速率常数对二甘醇、乙醛和PET的质量流量及PET的相对分子质量影响较大;热裂解反应的速率常数、酯化反应速率常数对对苯二甲酸的质量流量影响较大;传质因子对PET的数均相对分子质量(Mn)影响较大。根据修正后的PET终缩聚的机理模型,得到羧基转化率、PET的Mn、端羧基值等模型数据与实测数据相对偏差在2%以内。The reported kinetics mechanism, mass-transfer mechanism and their parameters for polyethylene terephthalate （PET） polycondensation were summarized, and the corresponding model was established. The effects of the polycondensation rate constant, the esterification rate constant, the hydrolysis rate constant, the thermal degradation rate constant, diethylene glycol formation, acetaldehyde formation and mass-transfer factor on PET polycondensation were studied. The model was revised by using plant data. The results showed that the rate constants for the polycondensation, the hydrolysis and the thermal degradation could evidently affect the mass flows of diglycol, acetaldehyde and PET, and PET relative molecular mass. The rate constants of the thermal degradation and the esterification had significant effects on the terephthalic acid mass flow. The effect of masstransfer factor on the number average relative molecular mass（Mn） of PET was obvious. Based on the revised model of PET polycondensation, all the errors between plant data and simulation data for carboxyl conversion, M, of PET and mass mole concentration of the terminal carboxyl group were less than 2%.

关 键 词：聚对苯二甲酸乙二醇酯 动力学 传质 流程模拟 缩聚 

分 类 号：TQ015.9[化学工程]