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中文摘要：
以Spheripol工艺（环管-环管-流化床）为例,在获得聚丙烯性能指标（熔融指数与乙烯的摩尔分数）累积值与瞬时值的微分关系和动态计算公式的基础上,以切换时间最短为目标,建立多釜串联的聚丙烯产品牌号切换优化模型.通过同时优化各反应器中氢气的质量浓度、乙烯的摩尔分数和聚单体温度等操作变量,使得产品牌号的切换时间最短.研究表明,通过对环管反应器中氢气的质量浓度和流化床中乙烯的摩尔分数的过调能分别有效地调控产品的熔融指数和乙烯的摩尔分数;维持各反应器中的聚合温度平缓地变化,能有效抑制聚合过程的剧烈变化,保证切换生产过程的安全进行.
英文摘要：
A model of grade transition for the industrial multi-reactor polypropylene production process was conducted according to the Spheripol technique （loop-loop-fluidized bed）.The model aimed at the minimum transition time was based on the formula between instantaneous and cumulative polypropylene properties.The time of grade transition can be minimized by the optimization of manipulated variable profiles in three reactors,such as hydrogen mass concentration,ethylene mole fraction,and polymerization temperature.Results show that the melt index can be controlled by over regulating the hydrogen mass concentration in loop reactors and the ethylene mole fraction can be controlled by the ethylene mole fraction in fluidized bed reactor respectively.The polymerization temperature profile was kept stable during grade transition,which can restrain the sharp adjustment of operation variables and ensure the safety of production.
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