基于Aspen Polymer的聚酯聚合反应研究及流程模拟

PET polymerization analysis and process simulation with Aspen Polymer

通过Aspen Polymer对对苯二甲酸和乙二醇进行逐步聚合生成聚酯的反应进行了研究。并采用间歇反应器模块分析了进料比、压力、温度对反应的影响，结果表明进料比为1.2～2.0是比较合适的，低压高温有利于聚合反应的进行。但过低的压力导致较低的反应速率而使反应时间增加，过高的温度也导致副产物大幅度增加。因此选择压力为0.001～0.2MPa，温度为260～285℃，在间歇反应器内进行逐步降压和逐步升温反应，并在此基础上，设计模拟了压力逐步降低、温度逐步升高的连续生产工艺流程并进行优化。经过优化后的连续生产工艺流程最终反应器出口聚合度达到121.1。

The step-growth polymerization of TPA and EG was studied with Aspen Polymer. The influences of feed ratio,pressure and temperature on polymerization were also analyzed with batch reactor block. The feed ratio from 1.2 to 2.0 was appropriate,low pressure and high temperature were beneficial to the reactions. But an overly low pressure led to more reaction time because of low reaction rate. On the other hand , high temperature resulted in more by-products. Thus the polymerization in a batch reactor was simulated with continuously dropping pressure from 0.001MPa to 0.2MPa and continuous climbing temperature from 260℃ to 285℃. On the basis of the result,a continuous production process was designed and optimized with the degree of polymerization reaching 121.1.