Pyrolysis kinetics and TG-FTIR analysis of waste epoxy printed circuit boards |
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Authors: | ZHAN Zhi-hua QIU Ke-qiang |
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Affiliation: | (1) Energy and Resources Research Institute, The University of Leeds, Leeds, LS2 9JT, UK |
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Abstract: | Thermal decomposition of waste epoxy PCBs was performed in different atmospheres (nitrogen, argon, air and vacuum) at a heating rate of 10 °C/min by DSC-TGA, and the pyrolysis characteristic was analyzed. The gases volatilized from the experiment were qualitatively analyzed by TG-FTIR. Kinetics study shows that pyrolysis reaction takes place between 300 and 400 °C, and the activation energies are 256, 212 and 186.2 kJ/mol in nitrogen, argon and vacuum, respectively. There are two mass-loss processes in the decomposition under air atmosphere. In the first mass-loss process, the decomposition is the main reaction, and in the second process, the oxidation is the main reaction. The activation energy of the second mass-loss process is 99.6 kJ/mol by isothermal heat-treatments. TG-FTIR analysis shows carbon dioxide, carbon monoxide, hydrogen bromide, phenol and substituent phenol are given off during the pyrolysis of waste epoxy PCBs. |
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Keywords: | pyrolysis kinetics waste printed circuit boards |
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