Study on Pyrolysis Behavior and Kinetic Measurement of Typical Mixed Plastic Waste by Model-Free Combined with Model-Fitting Method

Pyrolysis technology can chemically convert waste plastics into products of low molecular weight or high added value with the prospect of large-scale disposal. In this study, the pyrolytic characteristics and kinetic parameters of solid plastic waste and its mixtures were analyzed for typical components of plastic waste. Thermogravimetric Analysis (TGA) for mixed plastics with different compositions was carried out under four heating rates (10, 20, 30, and 40 K/min). Then the model-free method (Flynn-Wall-Ozawa (F-W-O), Starink, Kissinger-Akahira-Sunose (K-A-S)) and model-fitting method (Malek and Coats-Redfern (C-R)) were combined to deduce more reliable dynamic parameters. In addition, the degree of mutual influence between individual components and mixed plastic material was analyzed. This research can provide ideas and theoretical support for the design of a mixed plastic waste reactor.