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Thermal Degradation and Kinetic Analysis of Multi- layered Plastics

Multi-layered plastics are a great challenge for the waste recycling industry. The majority of multi-layered plastics consist of two or more types of polymers, making it difficult to recycle mechanically, which leads to landfill or incineration plant. As a way of thermochemical recycling, pyrolysis is a promising cleaner technology that could use multi-layered waste plastics potential and convert it into valuable products like fuels and chemicals. To better understand the pyrolysis process of multi-layered plastics, thermogravimetric analysis was carried out to determine their thermochemical behaviour and kinetic parameters. Thermogravimetric measurements were conducted in a nitrogen atmosphere at heating rates of 5, 10, 15 and 20 °C/min in the temperature range 40−600 °C. Kinetic analysis was done using the isoconversional model- free Friedman method in combination with an advanced statistical approach. Thermogravimetric analysis revealed how decomposition occurs in the range 350−510 °C and the weight loss >90% indicating high volatile matter content, hence potential for pyrolytic oil production. The results of the kinetic analysis showed how pyrolysis of multi-layered plastics is a complex process consisting of three decomposition stages. The activation energy values determined by Friedman were rising with the degree of conversion from 127 kJ/mol at 0.01 to 219 kJ/mol at 0.95.

Multi-layered plastics ; thermochemical recycling ; pyrolysis ; dynamic thermogravimetric analysis ; kinetic study

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