Thermal degradation and kinetic study for different waste/rejected plastic materials

A kinetic analysis based on thermal decomposition of rejected polypropylene, plastic Elm 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 degrees C min(-1) have been performed from ambient to 700 degrees C 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+22 min(-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.