Korean Journal of Chemical Engineering, Vol.30, No.3, 626-633, 2013
Thermal degradation and kinetic study for different waste/ rejected plastic materials
A kinetic analysis based on thermal decomposition of rejected polypropylene, plastic film and plastic pellets collected from different industrial outlet has been carried out. Non-isothermal experiments using different heating rates of 5, 10, 20, 30, 40 and 50℃ min.1 have been performed from ambient to 700 ℃ in a thermo-balance with the objective of determining the kinetic parameters. The values of activation energy and frequency factor were found to be in the range of 107-322 kJ/mol, 85-331 kJ/mol, 140-375 kJ/mol and 3.49E+07-4.74E+22 min^(-1), 3.52E+06-2.88E+22min^(-1), 7.28E+13-1.17E+25 min^(-1) for rejected polypropylene, plastic film and plastic pellets, respectively, by Coats-Redfern and Ozawa methods including different models. Kissinger method, a model free analysis is also adopted to find the kinetic parameters. Activation energy and frequency factor were found to be 108 kJ/mol, 98 kJ/mol, 132 kJ/mol and 6.89E+03, 2.12E+02, 8.06E+05 min^(-1) for rejected polypropylene, plastic film and plastic pellets, respectively, by using the Kissinger method.
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