Thermodynamic Effects on Grade Transition of Polyethylene Polymerization in Fluidized Bed Reactors,Macromolecular Reaction Engineering

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Thermodynamic Effects on Grade Transition of Polyethylene Polymerization in Fluidized Bed Reactors
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2020-06-02 , DOI: 10.1002/mren.202000013
Sabrine Kardous ₁ , Timothy F. L. McKenna ₂ , Nida Sheibat‐Othman ₁

Affiliation

An off‐line dynamic optimization procedure is employed to optimize the transition between different grades of linear low density polyethylene in a fluidized bed reactor. This type of reactor is frequently operated under condensed mode, which consists of injecting induced condensing agents (ICA) to absorb part of the reaction heat. However, the presence of ICA affects the solubility of monomers in the polymer, so it is important to account for this effect in a grade transition optimization strategy. A kinetic model is combined with a thermodynamic model based on the Sanchez–Lacombe equation of state to describe the grade transitions. Simplified correlations are then suggested to predict the impact of ICA on ethylene and comonomer solubility in a quaternary system. The results highlight the importance of the thermodynamic model during grade transition.

中文翻译：

流化床反应器中聚乙烯聚合反应的热力学效应

离线动态优化程序可用于优化流化床反应器中不同等级的线性低密度聚乙烯之间的过渡。这种类型的反应器通常在冷凝模式下运行，该模式包括注入感应冷凝剂（ICA）以吸收部分反应热。但是，ICA的存在会影响单体在聚合物中的溶解度，因此重要的是要在梯度过渡优化策略中考虑这种影响。基于Sanchez-Lacombe状态方程的动力学模型与热力学模型相结合，描述了相变。然后提出简化的相关性，以预测ICA对四元体系中乙烯和共聚单体溶解度的影响。

更新日期：2020-06-02

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