A Single Particle Model to Predict the Impact of Induced Condensing Agents on Polymerizing Particles During the Gas Phase Polymerization of Ethylene,Macromolecular Reaction Engineering

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A Single Particle Model to Predict the Impact of Induced Condensing Agents on Polymerizing Particles During the Gas Phase Polymerization of Ethylene
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2021-06-18 , DOI: 10.1002/mren.202100016
Amel Ben Mrad ₁ , Nida Sheibat‐Othman ₂ , Timothy F. L. McKenna ₁

Affiliation

A single particle model for homopolymerization of ethylene in the presence of hydrogen is used to predict the impact of induced condensing agents on the evolution of concentration profiles in the growing particle, the rate of homopolymerization, and the evolution of the molecular weight distribution. The model formulation is based on the random-pore polymer flow model associated with a kinetic model using the method of moments to describe the chain length. The Sanchez–Lacombe equation of state is applied to calculate the equilibrium concentration of each penetrant in a mixture of gases in the amorphous polymer phase. The free volume model from Vrentas and Duda is employed to calculate the diffusivity coefficients of penetrants in a semi-crystalline polymer. The model confirms that the increased rates of production and increased molecular weights observed in previously published experimental studies are due in large part to the co-solubility and co-diffusivity effects.

中文翻译：

乙烯气相聚合过程中诱导缩合剂对聚合粒子影响的单粒子模型预测

在氢气存在下乙烯均聚的单颗粒模型用于预测诱导冷凝剂对生长颗粒中浓度分布、均聚速率和分子量分布演变的影响。模型公式基于与动力学模型相关的无规孔聚合物流动模型，该动力学模型使用矩量法来描述链长。Sanchez-Lacombe 状态方程用于计算无定形聚合物相中气体混合物中每种渗透剂的平衡浓度。Vrentas 和 Duda 的自由体积模型用于计算半结晶聚合物中渗透剂的扩散系数。

更新日期：2021-06-18

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