Pyrolysis kinetics and TG-FTIR analysis of waste epoxy printed circuit boards

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.

[1]  Guan Jie,et al.  Product characterization of waste printed circuit board by pyrolysis , 2008 .

[2]  H P Wang,et al.  Fate of bromine in pyrolysis of printed circuit board wastes. , 2000, Chemosphere.

[3]  Lorenza Operti,et al.  GC/MS Identification of Pyrolysis Products from Fire-retardant Brominated Epoxy Resin , 2005 .

[4]  I. Hasegawa,et al.  Pyrolysis of the mixture of biomass and plastics in countercurrent flow reactor Part I: Experimental analysis and modeling of kinetics , 2008 .

[5]  I. Marco,et al.  Pyrolysis of electrical and electronic wastes , 2008 .

[6]  Guido Grause,et al.  Pyrolysis of tetrabromobisphenol-A containing paper laminated printed circuit boards. , 2008, Chemosphere.

[7]  Paul T. Williams,et al.  PYROLYSIS OF BROMINATED FEEDSTOCK PLASTIC IN A FLUIDISED BED REACTOR , 2006 .

[8]  Seung Goo Lee,et al.  Oxidative stabilization mechanism of poly(vinyl chloride) pitch , 2000 .

[9]  M. Zanetti,et al.  Thermal decomposition of fire retardant brominated epoxy resins cured with different nitrogen containing hardeners , 2007 .

[10]  Joseph LaDou,et al.  Printed circuit board industry. , 2006, International journal of hygiene and environmental health.

[11]  Youn Min Chou,et al.  Kinetics of thermal and oxidative decomposition of printed circuit boards , 1999 .

[12]  T. V. Bukharkina,et al.  Kinetics of Aerobic Liquid-Phase Oxidation of Organic Compounds , 2004 .

[13]  Xuguang Jiang,et al.  TG-FTIR analysis of PVC thermal degradation and HCl removal , 2008 .

[14]  Paul T. Williams,et al.  Separation and recovery of materials from scrap printed circuit boards , 2007 .

[15]  Thallada Bhaskar,et al.  Pyrolysis studies of PP/PE/PS/PVC/HIPS-Br plastics mixed with PET and dehalogenation (Br, Cl) of the liquid products , 2004 .

[16]  Jie Guo,et al.  Recycling of waste printed circuit boards: a review of current technologies and treatment status in China. , 2009, Journal of hazardous materials.

[17]  Duan Ji-an,et al.  The relationship between IR characteristic peak and microstructure of the glass used as optical fiber , 2006 .

[18]  Qunwu Huang,et al.  Thermogravimetric characteristics and kinetic of plastic and biomass blends co-pyrolysis , 2006 .

[19]  Ting-Chien Chen,et al.  Pyrolysis characteristics of integrated circuit boards at various particle sizes and temperatures. , 2007, Journal of hazardous materials.

[20]  Paul T. Williams,et al.  Removal of organobromine compounds from the pyrolysis oils of flame retarded plastics using zeolite catalysts , 2008 .

[21]  Rafael Font,et al.  Pyrolysis and combustion of electronic wastes , 2009 .