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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。
Based on the macroscopical kinetics of propylene polymerization, aiming at the characteristics of propylene polymerization process of batch liquid phase bulk polymerization, the polymerization process of propylene was decomposed into heating stage and thermostatic stage to establish a polymerization reactor model. Using MathCAD software to solve the model, the calculated results deviate from the actual production data by less than ± 5%. From the reaction exotherm and the system heat load, the reaction process of the device was simulated and analyzed. The exothermic reaction was the least during the pre-reaction (<50 ℃). When the reaction proceeded to 67 min-70 min, the exothermic reaction reached the maximum. Pre-control temperature reached 50 ℃ within 20 min, which is conducive to the activation of the catalyst activity, reducing the peak exothermic reaction; at 50 ℃ ~ 75 ℃ warming phase, the reaction heat concentration, the slow rate of warming, can reduce the heat load fluctuations The frequency and amplitude, to achieve a smooth production control, reduce unit polypropylene energy consumption.