Solubility of supercritical CO2 in polystyrene

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-08-03 DOI:10.1016/j.supflu.2024.106374

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引用次数: 0

Abstract

Expanded polystyrene (ePS) plays an important role in the food packaging industry. However, the foaming process is environmentally unfriendly. A sustainable alternative is dissolving supercritical CO₂ (scCO₂) in the polystyrene (PS) matrix. Most studies so far were performed at temperatures above the PS glass transition temperature; however, a more general temperature window is desirable. In this work, the solubility of scCO₂ in polystyrene was measured at 323 K, 343 K, 363 K and 383 K and pressure up to 130 bar using a magnetic suspension balance (MSB). It was concluded that the solubility of CO₂ in PS decreases with temperature and increases with pressure. The Sanchez-Lacombe Equation of State was utilized to estimate the degree of swelling. The model developed was able to derive the experimentally determined solubilities after correction for the swelling. The interaction parameter, k₁₂, turned out to be only a function of temperature. With these results the solubility and swelling of PS in scCO₂ can be more accurately assessed for different temperatures and pressures.

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超临界二氧化碳在聚苯乙烯中的溶解度

发泡聚苯乙烯（ePS）在食品包装行业发挥着重要作用。然而，发泡工艺并不环保。一种可持续的替代方法是在聚苯乙烯（PS）基质中溶解超临界 CO（scCO）。迄今为止，大多数研究都是在高于 PS 玻璃转化温度的条件下进行的；然而，我们需要一个更宽泛的温度窗口。在这项工作中，使用磁悬浮天平 (MSB) 在 323 K、343 K、363 K 和 383 K 以及高达 130 bar 的压力下测量了 scCO 在聚苯乙烯中的溶解度。结果表明，一氧化碳在聚苯乙烯中的溶解度随温度升高而降低，随压力升高而升高。利用 Sanchez-Lacombe 状态方程估算了溶胀程度。在对溶胀进行修正后，所建立的模型能够推导出实验测定的溶解度。结果表明，相互作用参数 k 只是温度的函数。有了这些结果，就可以更准确地评估 PS 在不同温度和压力下在 scCO 中的溶解度和溶胀度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.