环管反应器中稳态操作的聚丙烯液相本体聚合的模拟

 采用机理建模方法，研究了丙烯在环管反应器中的液相本体聚合过程。基于流体全混流流动模式并机理分析方法，建立了环管反应器中的丙烯液相本体聚合的微观数学模型，模拟了在稳态操作条件下环管反应器中丙烯液相本体聚合动力学。以采集到的工业数据对模型进行了考核。从反应器内反应物料密度和聚合物熔融指数来看，模拟结果与工业现场采集数据相吻合。采用模型考察了稳态下，主要工艺条件下对丙烯聚合过程的影响。结果表明，丙烯转化率和聚合产物质均相对分子质量均随聚合温度升高而增加；随丙烯进料量的增加，转化率下降，聚合产物质均相对分子质量则先增加后减小；随催化剂量的增加，转化率与聚合产物质均相对分子质量均增加；而H2进料量对转化率没有影响，但增加H2进料量将导致聚合产物质均相对分子质量下降。

SIMULATION FOR LIQUID PHASE BULK PROPYLENE POLYMERIZATION IN LOOP REACTOR AT STEADY OPERATION CONDITIONS

The liquid phase bulk propylene polymerization in loop reactor was simulated based on the polymerization mechanism. According to the flow behavior in the loop reaclor and the mechanism analysis of bulk polymerization of propylene, the micro-model for liquid phase bulk propylene polymerization in loop reactor at steady operation condition was proposed in order to determine the polymerization kinelics. Moreover, the proposed model was testified by using the spot data in industry. The comparison between simulated and industrial data of the materiel density and melt index showed that they were in good agreement with each other. The model was applied to investigate the effects of the main factors, including polymerization temperature, the mass flow rates of propylene, eatalyst and hydrogen, on the polymerization process. The results indicated thai the propylene conversion and lhe weighted average relative molecular mass of the product polymer increased wilh the rise of polymerization lemperature. With the increase of the mass flow rate of propylene, the conversion decreased, and the weighted average relative molecular mass of the product polymer increased first and then decreased. The conversion and weighted average relative molecular mass increased with the increase of the mass flow rate of catalyst. However, the mass flow rate of hydrogen had no effect on the conversion, but the increase of hydrogen could cause the weighted average relative molecular mass of the product polymer to be decreased.