Based on experiment and quantum chemical calculations: a study of the co-pyrolysis mechanism of polyesterimide enameled wires with polyvinyl chloride and the catalytic effect of endogenous metal Cu

IF 12.4 Q1 ENVIRONMENTAL SCIENCES Resources Environment and Sustainability Pub Date : 2024-09-01 DOI:10.1016/j.resenv.2024.100167

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Abstract

Pyrolysis technology is a green and efficient method for recycling enameled wires. However, since waste enameled wires are typically recovered from electronic waste, they often contain small amounts of wires and cables. Therefore, during the pyrolysis process of waste enameled wires, it is inevitable for the paint film and the cable sheath to undergo co-pyrolysis. Polyesterimide enameled wires (EPEsI) and polyvinyl chloride (PVC) were chosen as represent enameled wires and cable sheath materials, respectively. Using thermogravimetric analysis with various pyrolysis kinetic analysis methods, the pyrolysis characteristics and kinetics of EPEsI and Mixture (mixture of EPEsI and PVC) were studied. Through synergy analysis and pyrolysis-gas chromatography/mass spectrometry analysis, the influence of PVC on the pyrolysis of EPEsI was elucidated from aspects such as pyrolysis characteristics and product distribution. Based on density functional theory calculations and wave function analysis, the role of endogenous metal Cu in EPEsI on the pyrolysis processes of PEsI and PVC, as well as the mechanism of HCl from PVC on the pyrolysis of PEsI, were clarified.

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基于实验和量子化学计算：聚酯酰亚胺漆包线与聚氯乙烯共热解机理及内源金属 Cu 催化作用的研究

热解技术是一种回收漆包线的绿色高效方法。然而，由于废漆包线通常是从电子垃圾中回收的，其中往往含有少量的电线和电缆。因此，在热解废漆包线的过程中，漆膜和电缆护套不可避免地会发生共热解。我们选择聚酯亚胺漆包线（EPEsI）和聚氯乙烯（PVC）分别作为漆包线和电缆护套的代表材料。利用热重分析和各种热解动力学分析方法，研究了 EPEsI 和 Mixture（EPEsI 和 PVC 的混合物）的热解特性和动力学。通过协同分析和热解-气相色谱/质谱分析，从热解特性和产物分布等方面阐明了 PVC 对 EPEsI 热解的影响。基于密度泛函理论计算和波函数分析，阐明了 EPEsI 中的内源金属 Cu 对 PEsI 和 PVC 热解过程的作用，以及 PVC 中的 HCl 对 PEsI 热解的作用机理。

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