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<p>Pyrolysis is recognized as a promising technology for waste plastics management. Although extensive research has been conducted on the pyrolysis of waste plastics, the synergistic effects during the co-pyrolysis of PET with other plastics have not been thoroughly investigated. The behaviors of polyethylene terephthalate (PET), low-density polyethylene (LDPE), polypropylene (PP), and their mixtures were investigated by thermogravimetric analysis (TGA) under varying heating rates. The model-free methods (Flynn–Wall–Ozawa, Starink) were combined with the model-fitting methods (Malek, Coats–Redfern) to analyze the pyrolysis kinetics systematically. The activation energies of the pyrolysis process were determined using model-free methods, the pyrolysis mechanism functions were summarized via model-fitting approaches, and the synergistic effects of co-pyrolysis were analyzed. The results indicate that the synergistic effects are most pronounced during the co-pyrolysis of PET/LDPE/PP mixtures. The activation energy for the co-pyrolysis of PET/LDPE/PP was the lowest (148.4 ± 2.5&#xa0;kJ·mol⁻¹), representing a 25.7% reduction compared with the theoretical value (199.8&#xa0;kJ·mol⁻¹). Compared with the theoretical weighted oil yields of the individual plastics (50.2%), the actual oil yield from co-pyrolysis increased by 10.6%, reaching 60.8 ± 0.7%. This study provides a feasible technical approach and theoretical basis for achieving closed-loop recycling of waste plastics, following the concept of “from plastics to plastics.”</p>

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The influence of synergistic effects in mixed plastics on pyrolysis kinetics and product distribution

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Xuebin Chang,
  • Yangyifan Zhang,
  • Yang Yu,
  • Wei Tong,
  • Fengfu Yin

摘要

Pyrolysis is recognized as a promising technology for waste plastics management. Although extensive research has been conducted on the pyrolysis of waste plastics, the synergistic effects during the co-pyrolysis of PET with other plastics have not been thoroughly investigated. The behaviors of polyethylene terephthalate (PET), low-density polyethylene (LDPE), polypropylene (PP), and their mixtures were investigated by thermogravimetric analysis (TGA) under varying heating rates. The model-free methods (Flynn–Wall–Ozawa, Starink) were combined with the model-fitting methods (Malek, Coats–Redfern) to analyze the pyrolysis kinetics systematically. The activation energies of the pyrolysis process were determined using model-free methods, the pyrolysis mechanism functions were summarized via model-fitting approaches, and the synergistic effects of co-pyrolysis were analyzed. The results indicate that the synergistic effects are most pronounced during the co-pyrolysis of PET/LDPE/PP mixtures. The activation energy for the co-pyrolysis of PET/LDPE/PP was the lowest (148.4 ± 2.5 kJ·mol⁻¹), representing a 25.7% reduction compared with the theoretical value (199.8 kJ·mol⁻¹). Compared with the theoretical weighted oil yields of the individual plastics (50.2%), the actual oil yield from co-pyrolysis increased by 10.6%, reaching 60.8 ± 0.7%. This study provides a feasible technical approach and theoretical basis for achieving closed-loop recycling of waste plastics, following the concept of “from plastics to plastics.”