TG-FTIR Analysis on Pyrolysis Characteristics of Waste Plastics
Pyrolysis and emission characteristics of waste plastics of a paper mill were investigated at different heating rates by using thermogravimetric analysis coupled with Fourier transfer infrared spectrometer(TG-FTIR).Results showed that the process of pyrolysis was divided into two stages including dechlorination and fracture of carbon chain by forming smaller molecules hydrogen compounds.Mass loss and peak slightly increased with increasing heating rate.Doyle method was used to analyze activation energy of waste plastic pyrolysis and it turned out that the activation energy increased with the extent of pyrolysis reaction.Dechlorination followed the three-dimensional diffusion spherically symmetric model and Jander equation was the probable function,while the fracture of carbon chain followed two-dimensional cylindrical symmetric model. Emission gases in the process of pyrolysis were almost the same at different heating rates.Hydrogen chloride and most hydrocarbons were released at the first stage and the second stage of pyrolysis respectively.