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Journal of Material Cycles and Waste Management

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18-07-2022 | ORIGINAL ARTICLE

Nonisothermal pyrolysis kinetics of waste printed circuit boards and product characterization using TG–MS

Authors: Qihao Jiang, Hanlin Wang, Jingxin Liu, Teng Wang, Meng Mei, Si Chen, Jinping Li

Published in: Journal of Material Cycles and Waste Management | Issue 6/2022

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Abstract

With characteristics of high resources, complex composition, and high toxicity, the treatment and disposal of waste printed circuit boards (WPCBs) have attracted widespread attention, and pyrolysis is regarded as a potential recovery method. In this study, the behaviors, kinetics, and mechanisms of WPCBs pyrolysis were systematically investigated. The pyrolysis process could be divided into three stages: evaporation stage, reaction stage, and stabilization stage. The mass losses of these stages at different heating rates were determined to be < 1%, 10.84–14.11%, and 6.37–8.82%, respectively. Four model-free methods (Friedman, Tang, Starink, and Bosewell) and the distributed activation energy method (DAEM) were used to reveal the pyrolysis kinetics of WPCBs. According to the model-free methods, the apparent activation energy (E_α) decreased with increasing conversion (α) in the range of 0.05–0.25, then increased in the α range of 0.30–0.75, and finally decreased. The Bosewell method possessed the highest fitting degree, and the E_α was calculated as 133.94–204.01 kJ/mol. The components in volatile products were detected using thermogravimetry–mass spectrometry (TG–MS), and the main components were identified as CO₂, CH_4, H₂O, phenol, etc. Based on characteristics of these products, the pyrolysis mechanisms of brominated and non-brominated structures in brominated epoxy resins were expounded.

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Title: Nonisothermal pyrolysis kinetics of waste printed circuit boards and product characterization using TG–MS
Authors: Qihao Jiang
Hanlin Wang
Jingxin Liu
Teng Wang
Meng Mei
Si Chen
Jinping Li
Publication date: 18-07-2022
Publisher: Springer Japan
Published in: Journal of Material Cycles and Waste Management / Issue 6/2022
Print ISSN: 1438-4957
Electronic ISSN: 1611-8227
DOI: https://doi.org/10.1007/s10163-022-01464-z

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