Solubility of Polyethylene in n-Hexane and Cyclohexane: Experimental Determination and Comparison with Solid–Liquid Equilibria-Based Predictions,Industrial & Engineering Chemistry Research

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Solubility of Polyethylene in n-Hexane and Cyclohexane: Experimental Determination and Comparison with Solid–Liquid Equilibria-Based Predictions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-10-07 , DOI: 10.1021/acs.iecr.1c02406
Jan-Hendrik Arndt ₁ , Robert Brüll ₁ , Tibor Macko ₁ , Francisco Perez ₂ , Jens Panitzky ₂

Affiliation

In polyethylene (PE) production, the slurry process, in which the polymer is suspended as a slurry in a diluent, is particularly relevant. In the slurry state, partial solubilization of the polymer may occur. This may ultimately lead to wax formation, reactor fouling and polymer agglomeration. These issues may be alleviated by empirically adapting polymerization conditions, but a rational approach to that necessitates detailed information about polymer solubility. This information can be obtained through quantification of solid–liquid equilibria (SLE), which, in turn, necessitate input from experimental data. With an experimental setup for cloud point temperature determinations, the necessary data input was obtained to estimate the SLE of different PE (high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE)) in typical slurry process diluents. The cloud point temperatures predicted by the developed models were checked against experimental results. It was established that the behavior of solvent mixtures can be predicted based on that of their components.

中文翻译：

聚乙烯在正己烷和环己烷中的溶解度：实验测定并与基于固液平衡的预测进行比较

在聚乙烯 (PE) 生产中，将聚合物作为浆液悬浮在稀释剂中的浆液工艺尤其重要。在淤浆状态下，聚合物可能会发生部分溶解。这可能最终导致蜡形成、反应器结垢和聚合物附聚。这些问题可以通过经验调整聚合条件来缓解，但合理的方法需要有关聚合物溶解度的详细信息。这些信息可以通过固液平衡 (SLE) 的量化获得，而这又需要从实验数据中输入。通过用于浊点温度测定的实验装置，获得了必要的数据输入以估计不同 PE（高密度聚乙烯 (HDPE)、线性低密度聚乙烯 (LLDPE)) 在典型的淤浆工艺稀释剂中。开发模型预测的浊点温度与实验结果进行了核对。已确定溶剂混合物的行为可以根据其组分的行为进行预测。

更新日期：2021-10-20

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