An Experimental Approach to Determining the Average Diffusion Coefficient of Volatile Components in Polymer Waste Materials

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Recycling Pub Date : 2023-09-21 DOI:10.3390/recycling8050072
Chi Nghia Chung, Christian Marschik, Jakub Klimosek, Juraj Kosek, Mohamad Hassan Akhras, Georg Steinbichler
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引用次数: 0

Abstract

One of the major challenges in recycling plastics is the removal of undesired volatile components from the polymeric phase, which may reduce process efficiency and negatively affect product quality. Accordingly, the recycling industry employs a broad range of degassing techniques, the efficiency of which often depends on the diffusion coefficient—a measure of the mass transport of volatile components in polymeric phases. The aim of this study was to develop a practically feasible experimental approach using thermogravimetric analysis (TGA) to determine the average diffusion coefficient of volatile components in polymer waste materials. First, the TGA method was validated with a pressure decay apparatus (PDA) using predefined binary material mixtures: Thin sheets were pressed from virgin high-density polyethylene (HDPE) and polypropylene (PP) and deliberately saturated with toluene in a sorption experiment. These saturated samples were then used in TGA and PDA desorption experiments at 60 °C, 80 °C and 100 °C, which yielded similar results with an average difference of 7.4% for the HDPE-toluene system and 14.7% for the PP-toluene system. When validated, TGA was employed to determine the diffusion coefficient of volatile components in post-industrial plastic waste melt at a temperature of 220 °C. The proposed method contributes to the understanding of diffusion-based mass transport in polymer waste materials and provides a key parameter for model-based process control and optimization. In practice, the diffusion coefficient results can be used to predict the degassing performance of an extrusion process in the mechanical recycling of plastic waste.
测定高分子废弃物中挥发性组分平均扩散系数的实验方法
回收塑料的主要挑战之一是从聚合物相中去除不需要的挥发性成分,这可能会降低工艺效率并对产品质量产生负面影响。因此,回收工业采用了广泛的脱气技术,其效率往往取决于扩散系数——一种衡量聚合物相中挥发性组分的质量传输的指标。本研究的目的是开发一种实际可行的实验方法,利用热重分析(TGA)来确定聚合物废料中挥发性组分的平均扩散系数。首先,用压力衰减仪(PDA)验证TGA方法,使用预定义的二元材料混合物:从高密度聚乙烯(HDPE)和聚丙烯(PP)中压制薄片,并在吸附实验中故意用甲苯饱和。将饱和后的样品分别在60℃、80℃和100℃下进行TGA和PDA解吸实验,结果相似,hdpe -甲苯体系的平均差异为7.4%,pp -甲苯体系的平均差异为14.7%。验证后,采用热重分析仪测定了工业后塑料废液中挥发性组分在220℃下的扩散系数。该方法有助于理解聚合物废弃物中基于扩散的质量传递,并为基于模型的过程控制和优化提供关键参数。在实际应用中,扩散系数结果可用于预测塑料垃圾机械回收中挤出工艺的脱气性能。
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
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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