Abstract
Green and sustainable treatment of waste plastics emerged as one of the greatest challenging matters facing the world. In this work, the pyrolysis of chlorine-contained PVC plastics was investigated from a kinetic study perspective. The dual effects of calcium oxide (CaO) additive were examined. The Fraser-Suzuki deconvolution function was adopted to fit the differential thermogravimetric (DTG) curves into three pseudo-reactions. The apparent activation enegry (Ea), pre-exponential factor (A) and reaction mechanism models (f(a)) for each pseudo-reaction were identified. The results show that the use of CaO increased significantly the Ea value of the dehydrochlorination reaction but lowered that of the tar cracking reactions, indicating an apparent HCl release mitigation as well as tar compounds decomposition. The mechanism models of the three pseudo-reactions kept identical with or without CaO addition, which were A4 Avrami-Erofeev: ƒ(α)=4(1-α) [-ln(1-α)]3⁄4 for pseudo-reactions 1 and 3 and B1 Prout-Trompkins: ƒ(α)=α(1-α) for pseudo-reactions 2. The kinetic models of the pyrolysis of waste PVC and the mixtures were thus established. The obtained results could be used as a theoretical basis for the development and application of clean and efficient waste PVC plastics pyrolysis technology.
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