间歇液相本体丙烯聚合过程的模拟与分析

Simulation and analysis of batch liquid phase bulk polymerization of propylene

在丙烯聚合反应宏观动力学的基础上,针对间歇液相本体丙烯聚合工艺的特点,将丙烯聚合过程分解为升温阶段和恒温阶段建立聚合反应器模型。采用MathCAD软件解算模型,计算出的结果与实际生产数据偏差小于±5%。从反应放热和系统热负荷两个方面模拟分析装置的反应过程,反应前期(<50℃)反应放热最少,当反应进行到67 min～70 min时,反应放热达到最大值,在反应前期控制温度在20 min之内达到50℃,有利于催化剂活性的发挥,降低反应放热峰值;在50℃～75℃升温阶段,反应放热集中,以缓和的速度升温,能够减少热负荷波动的频率和幅度,实现平稳生产控制,降低单位聚丙烯能耗。

The process of batch liquid phase bulk polymerization of propylene was divided into elevation of temperature stage and constant temperature stage according to its characters. Reactor model was established based on the kinetics of polymerization reaction of propylene. The MathCAD software was used in solving the model. The deviations between calculation results and the sit data were no more than ± 5%. The output of the reaction heat and the thermal load of the reaction system in practical operation were studied. The output of reaction heat was little in the precious period （ 〈 50~C ） and achieved the maximum during 67 min - 70 min from the beginning. The proper conduct was to raise the system temperature to 50℃ within 20 min in the precious period, which could cut down the maximum of the output of the reaction heat. While at the elevation of temperature stage（50℃ -75℃ ） , the output of the reaction heat concentrated. It could reduce energy consumption and control the thermal load smoothly to smooth down the heating rate at this stage.