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Study on the pyrolysis behaviors of mixed waste plastics

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  • Li, Dan
  • Lei, Shijun
  • Wang, Ping
  • Zhong, Lei
  • Ma, Wenchao
  • Chen, Guanyi

Abstract

Pyrolysis is considered as a promising technology to recover valuable hydrocarbons from waste streams. Even though some studies exist on waste plastics pyrolysis, it still lacks of in-depth knowledge on multiple components plastics pyrolysis. This study explores three types of waste plastics and their mixed forms to obtain thermal cracking features, products distribution, and kinetic features. TG-FTIR was used to observe the decomposition characteristics and functional groups in the volatile fractions of products. The interaction effects of the plastics components during the co-pyrolysis process were compared, analyzed, and reported. For a more precise knowledge of the reaction procedure, a thermodynamic study was conducted. Results showed that TG and DTG curves of PS and PE were similar to each other but different from those of PVC. The main products of PE and PS pyrolysis were alkanes and alkenes, while the major products of PVC pyrolysis were HCl, alkenes, and a small number of aromatic compounds. During the co-pyrolysis process of PS with PVC and PE with PVC, the thermal decomposition rates of PVC were accelerated due to synergistic effect. Implied by the kinetic parameters, pyrolysis of PS, PE, and PVC exhibited one-order reaction from pure component to multiple component mixtures.

Suggested Citation

  • Li, Dan & Lei, Shijun & Wang, Ping & Zhong, Lei & Ma, Wenchao & Chen, Guanyi, 2021. "Study on the pyrolysis behaviors of mixed waste plastics," Renewable Energy, Elsevier, vol. 173(C), pages 662-674.
    • Handle: RePEc:eee:renene:v:173:y:2021:i:c:p:662-674
    DOI: 10.1016/j.renene.2021.04.035
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    References listed on IDEAS

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    1. Park, Ki-Bum & Jeong, Yong-Seong & Guzelciftci, Begum & Kim, Joo-Sik, 2020. "Two-stage pyrolysis of polystyrene: Pyrolysis oil as a source of fuels or benzene, toluene, ethylbenzene, and xylenes," Applied Energy, Elsevier, vol. 259(C).
    2. Burra, K.G. & Gupta, A.K., 2018. "Synergistic effects in steam gasification of combined biomass and plastic waste mixtures," Applied Energy, Elsevier, vol. 211(C), pages 230-236.
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    Cited by:

    1. Stančin, H. & Šafář, M. & Růžičková, J. & Mikulčić, H. & Raclavská, H. & Wang, X. & Duić, N., 2022. "Influence of plastic content on synergistic effect and bio-oil quality from the co-pyrolysis of waste rigid polyurethane foam and sawdust mixture," Renewable Energy, Elsevier, vol. 196(C), pages 1218-1228.
    2. Li, Chao & Sun, Yifan & Li, Qingyang & Zhang, Lijun & Zhang, Shu & Wang, Huaisheng & Hu, Guangzhi & Hu, Xun, 2022. "Effects of volatiles on properties of char during sequential pyrolysis of PET and cellulose," Renewable Energy, Elsevier, vol. 189(C), pages 139-151.
    3. Hueon Namkung & Se-In Park & Yoomin Lee & Tae Uk Han & Jun-Ik Son & Jun-Gu Kang, 2022. "Investigation of Oil and Facility Characteristics of Plastic Waste Pyrolysis for the Advanced Waste Recycling Policy," Energies, MDPI, vol. 15(12), pages 1-10, June.
    4. Agnieszka Kijo-Kleczkowska & Adam Gnatowski, 2022. "Recycling of Plastic Waste, with Particular Emphasis on Thermal Methods—Review," Energies, MDPI, vol. 15(6), pages 1-21, March.
    5. Li, Jie & Yu, Di & Pan, Lanjia & Xu, Xinhai & Wang, Xiaonan & Wang, Yin, 2023. "Recent advances in plastic waste pyrolysis for liquid fuel production: Critical factors and machine learning applications," Applied Energy, Elsevier, vol. 346(C).

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