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在25 kt/a间歇液相本体聚丙烯工业装置反应器机理模型的基础上,建立间歇丙烯聚合过程中产品分子量及分子量分布、熔融指数等性质的数学模型。采用BWRS状态方程计算氢在氢-丙烯系统气-液平衡常数,以分析生产中聚丙烯分子量及分子量分布、聚丙烯熔融指数等参数的变化情况及其影响因素。结果表明:氢在液相中的浓度是影响聚丙烯瞬时分子量的主要因素,主要受氢-丙烯系统气液平衡常数和液相固含率影响,氢在液相中的浓度与温度成正比,与液相固含率成反比。聚丙烯熔融指数模型由重均分子量关联得到,二者呈反比关系,熔融指数的变化与重均分子量变化相对应。瞬时分子量和产量是聚丙烯萤均分子量和熔融指数的主要影响因素。
Based on the model of 25 kt / a intermittent liquid bulk polypropylene reactor, a mathematical model of the molecular weight, molecular weight distribution and melt index of the batch propylene polymerization process was established. BWRS equation of state was used to calculate the gas-liquid equilibrium constant of hydrogen in propylene-propylene system to analyze the changes of polypropylene molecular weight and molecular weight distribution, polypropylene melt index and other influencing factors. The results show that the concentration of hydrogen in the liquid phase is the main factor affecting the instantaneous molecular weight of polypropylene. The concentration of hydrogen in the liquid phase is mainly affected by the gas-liquid equilibrium constant and liquid solid content of the hydrogen-propylene system. The concentration of hydrogen in the liquid phase is proportional to the temperature, The liquid phase solid content is inversely proportional. The polypropylene melt index model is derived from the correlation of weight average molecular weight, and the two are inversely proportional to each other. The change of melt index corresponds to the change of weight average molecular weight. Instantaneous molecular weight and yield are the main factors affecting the average molecular weight and melt index of polypropylene.