Vacuum pyrolysis characteristics of waste epoxy printed circuit boards |
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| Authors: | ZHAN Zhi-hua and QIU Ke-qiang |
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| Institution: | School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China;School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China |
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| Abstract: | Vacuum pyrolysis was employed to dispose scrap brominated epoxy printed circuit boards (PCBs). Pyrolysis characteristics of waste PCBs under normal pressure and vacuum were investigated in this paper. A detailed study on the analysis of the elemental composition of PCBs and the pyrolysis products was performed. The thermal decomposition kinetics was measured by a thermogravimetric (TG) analyzer. The activation energy of pyrolysis under nitrogen atmosphere and vacuum were 193 kJ/mol to 206 kJ/mol and 145 kJ/mol to 165 kJ/mol, respectively. The composition of materials was analyzed by elemental analyzer. The pyrolysis products were analyzed by GC (gas chromatograph), GC-MS (chromatography and mass spectrometry) and FT-IR (Fourier transform infrared spectroscopy). Vacuum helped to increase the yield of pyrolysis oil. The liquid yield of PCBs pyrolysis at 15 kPa and normal pressure were 31.3? and 23.5?, respectively. The main components in pyrolysis oils were phenol, isopropyl-phenol, and their brominated substitution. |
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| Keywords: | printed circuit board vacuum pyrolysis kinetics recycling |
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