Pyrolysis of Polyethylene Terephthalate via Infrared Heating: Comparing the Effect of the Heating Rate Factor on The Quality and Quantity of the Final Char Product

Document Type : Regular Article

Authors

Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, Iran.

Abstract
The pyrolysis of polyethylene terephthalate (PET) was investigated across a broad range of final temperatures, from 478°C to 640°C, yielding various products. Infrared radiation was employed as the heat source in this study. To minimize experimental deviations, each test under fixed conditions was repeated twice, and the results were compared for consistency. The primary objective was to evaluate the quantitative and qualitative differences in the products generated through this novel heating method, aiming to enhance the understanding of the pyrolysis process and the influence of the heating rate on the final outputs. Pyrolysis was conducted in a vertical tubular reactor housed within an infrared furnace. The average heating rates varied significantly, ranging from approximately 20.61°C/min in the slowest test to 161.12°C/min in the fastest one. The solid residue (char) resulted from PET pyrolysis was analyzed. The yields of 87.5% and 91% were recorded for the slowest and fastest heating rates respectively. These char samples were assessed using Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) to compare their quantity and quality. The findings revealed that the heating rate during the infrared pyrolysis of PET has a direct correlation with the quantity of valuable products, but an inverse relationship with their quality. 

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[1] Sarker MSA, Tusar MH, Salam B, Prince KGM, Investigation on pyrolysis of coconut shell for bio-oil production using infrared heat source, AIP Conference Proceedings, 1980 (2018) 060003. https://doi.org/10.1063/1.5044371
[2]  Sullivan L. How Big Oil Misled The Public Into Believing Plastic Would Be Recycled 11/09/2020 [Available from: https://www.npr.org/2020/09/11/897692090/how-big-oil-misled-the-public-into-believing-plastic-would-be-recycled
[3]  Geyer R, Jambeck JR, Law KL, Production, use, and fate of all plastics ever made, Science Advances, 3 e1700782. https://doi.org/10.1126/sciadv.1700782
[4]  Zander NE, Gillan M, Lambeth RH, Recycled polyethylene terephthalate as a new FFF feedstock material, Additive Manufacturing, 21 (2018) 174-82. https://doi.org/https://doi.org/10.1016/j.addma.2018.03.007
[5] Dhahak A, Hild G, Rouaud M, Mauviel G, Burkle-Vitzthum V, Slow pyrolysis of polyethylene terephthalate: Online monitoring of gas production and quantitative analysis of waxy products, Journal of Analytical and Applied Pyrolysis, 142 (2019) 104664. https://doi.org/https://doi.org/10.1016/j.jaap.2019.104664
[6] Papari S, Bamdad H, Berruti F, Pyrolytic Conversion of Plastic Waste to Value-Added Products and Fuels: A Review, Materials, 14 (2021) 2586. https://doi.org/10.3390/ma14102586
[7] Dimitrov N, Kratofil Krehula L, Ptiček Siročić A, Hrnjak-Murgić Z, Analysis of recycled PET bottles products by pyrolysis-gas chromatography, Polymer Degradation and Stability, 98 (2013) 972-9. https://doi.org/https://doi.org/10.1016/j.polymdegradstab.2013.02.013
[8] Brems A, Baeyens J, Vandecasteele C, Dewil R, Polymeric Cracking of Waste Polyethylene Terephthalate to Chemicals and Energy, Journal of the Air & Waste Management Association, 61 (2011) 721-31. https://doi.org/10.3155/1047-3289.61.7.721
[9] Kumagai S, Yamasaki R, Kameda T, Saito Y, Watanabe A, Watanabe C, et al., Tandem μ-reactor-GC/MS for online monitoring of aromatic hydrocarbon production via CaO-catalysed PET pyrolysis, Reaction Chemistry & Engineering, 2 (2017) 776-84. https://doi.org/10.1039/C7RE00097A
[10]      Artetxe M, Lopez G, Amutio M, Elordi G, Olazar M, Bilbao J, Operating Conditions for the Pyrolysis of Poly-(ethylene terephthalate) in a Conical Spouted-Bed Reactor, Industrial & Engineering Chemistry Research, 49 (2010) 2064-9. https://doi.org/10.1021/ie900557c
[11]      Luo S, Feng Y, The production of fuel oil and combustible gas by catalytic pyrolysis of waste tire using waste heat of blast-furnace slag, Energy Conversion and Management, 136 (2017) 27-35. https://doi.org/https://doi.org/10.1016/j.enconman.2016.12.076
[12]      Suresh A, Alagusundaram A, Kumar PS, Vo D-VN, Christopher FC, Balaji B, et al., Microwave pyrolysis of coal, biomass and plastic waste: a review, Environmental Chemistry Letters, 19 (2021) 3609-29. https://doi.org/10.1007/s10311-021-01245-4
[13]      Varma AK, Shankar R, Mondal P, A Review on Pyrolysis of Biomass and the Impacts of Operating Conditions on Product Yield, Quality, and Upgradation, In: Sarangi PK, Nanda S, Mohanty P, Eds. Recent Advancements in Biofuels and Bioenergy Utilization,  Singapore,  Springer Singapore, (2018),  p. 227-59. https://doi.org/10.1007/978-981-13-1307-3_10
[14] Atkins PW, De Paula J, Keeler J, Atkins' Physical Chemistry, Oxford University Press, (2018).
[15] Efimov M, Vasilev A, Muratov D, Panin A, Malozovskaya M, Karpacheva G, Application of Infrared Pyrolysis and Chemical Post-Activation in the Conversion of Polyethylene Terephthalate Waste into Porous Carbons for Water Purification, Polymers, 16 (2024) 891 1-21. https://doi.org/10.3390/polym16070891
[16] Liew RK, Chai C, Yek PNY, Phang XY, Chong MY, Nam WL, Su MH, Lam WH, Ma NL, Lam SS, Innovative Production of Highly Porous Carbon for Industrial Effluent Remediation via Microwave Vacuum Pyrolysis plus Sodium-Potassium Hydroxide Mixture Activation, Journal of Cleaner Production, 208 (2019) 1436-1445. https://doi.org/10.1016/j.jclepro.2018.10.214.