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开车过程作为聚乙烯装置运行的初始环节,对废料量、产品质量等有重要影响,而关于茂金属聚乙烯气相聚合开车过程动态模拟的研究比较少。本文以gPROMS为建模工具建立了气相流化床反应器中乙烯、1-丁烯在茂金属催化剂催化下共聚的动态模型,包括反应动力学、物料衡算、热量衡算等,并利用该模型模拟了乙烯气相聚合开车过程。模拟结果显示,开车过程所用时间、达到稳态后的各项指标与实际装置可以很好地吻合,聚乙烯分子量分布较窄也符合茂金属催化剂单一活性位的特点,表明建立的模型是准确有效的,可用于开展进一步的研究工作。
As the initial part of the operation of polyethylene plant, the driving process has an important influence on the amount of waste material and product quality. However, there are few studies on the dynamic simulation of metallocene polyethylene gas phase polymerization driving process. In this paper, gPROMS was used as a modeling tool to establish a dynamic model of ethylene and 1-butene copolymerization catalyzed by metallocene catalyst in a gas-phase fluidized bed reactor, including reaction kinetics, material balance calculation, heat balance calculation and so on. The model simulates the ethylene gas phase polymerization driving process. The simulation results show that the time spent in driving process and the steady state are in good agreement with the actual equipment. The narrower molecular weight distribution of polyethylene also accords with the single active site of metallocene catalyst, indicating that the established model is accurate and effective Which can be used for further research work.