Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emission monitoring
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RESEARCH
Pyrolysis kinetic modelling of abundant plastic waste (PET) and in‑situ emission monitoring Ahmed I. Osman1,2* , Charlie Farrell3,4, Alaa H. Al‑Muhtaseb5, Ahmed S. Al‑Fatesh6, John Harrison3 and David W. Rooney1
Abstract Background: Recycling the ever-increasing plastic waste has become an urgent global concern. One of the most convenient methods for plastic recycling is pyrolysis, owing to its environmentally friendly nature and its intrinsic properties. Understanding the pyrolysis process and the degradation mechanism is crucial for scale-up and reactor design. Therefore, we studied kinetic modelling of the pyrolysis process for one of the most common plastics, polyeth‑ ylene terephthalate (PET). The focus was to better understand and predict PET pyrolysis when transitioning to a low carbon economy and adhering to environmental and governmental legislation. This work aims at presenting for the first time, the kinetic triplet (activation energy, pre-exponential constant, and reaction rate) for PET pyrolysis using the differential iso-conversional method. This is coupled with the in-situ online tracking of the gaseous emissions using mass spectrometry. Results: The differential iso-conversional method showed activation energy (Ea) values of 165–195 kJ mol−1, R2 = 0.99659. While the ASTM-E698 method showed 165.6 kJ mol−1 and integral methods such as Flynn-–Wall and Ozawa (FWO) (166–180 kJ mol−1). The in-situ Mass Spectrometry results showed the gaseous pyrolysis emissions, which are C1 hydrocarbons and H–O-C=O along with C 2 hydrocarbons, C5–C6 hydrocarbons, acetaldehyde, the frag‑ ment of O–CH=CH2, hydrogen, and water. Conclusions: From the obtained results herein, thermal predictions (isothermal, non-isothermal and step-based heating) were determined based on the kinetic parameters. They can be used at numerous scale with a high level of accuracy compared with the literature. Keywords: Kinetic modelling, Plastic waste, Pyrolysis, Polyethylene terephthalate, Gaseous emissions, Plastic recycling
*Correspondence: [email protected] 1 School of Chemistry and Chemical Engineering, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, UK Full list of author information is available at the end of the article © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission
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