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<p>The large annual yield, wide application, and massive discard of plastics and tires have brought severe environmental issues. It is urgent to find an efficient way to recycle waste plastics and tires as high-value chemicals and energy fuels. Pyrolysis has long been considered a clean and productive technology. However, waste polymers are complex mixtures. The co-pyrolysis of the mixture is difficult but essential for energy and material recovery. This study investigated the co-pyrolysis of polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC) and tire waste (TW) using Thermogravimetric (TG) analysis, Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GC/MS), and lab-scale experiments. TG analysis showed that synergistic effect between PVC and TW was the most significant among all the experiments. In the lab-scale experiments, the interaction of PE/PVC and PE/TW improved olefin yield due to the synergistic effect while aromatics formation was promoted by PS/TW. The quality of the pyrolysis gas of PVC/TW was extremely high in the aspect of H<sub>2</sub> concentration. However, the component distribution of co-pyrolysis oil of PVC/TW revealed no evident synergistic effect in the micro-scale experiment. Finally, the possible reaction pathways were proposed to get a better understanding of co-pyrolysis. Our study provided theoretical guidance for mixed polymer co-pyrolysis and product regulation.</p>

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Comparative Study on the Synergistic Co-Pyrolysis of Plastics and Rubber Waste: Thermal Behavior and Product Distributions

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Yan Shao,
  • Yang Xia,
  • Shoukang Wang,
  • Jun Wang,
  • Yuan Wang,
  • Zihao Liu,
  • Fangfang Lou,
  • Jiahui Lei,
  • Qunxing Huang

摘要

The large annual yield, wide application, and massive discard of plastics and tires have brought severe environmental issues. It is urgent to find an efficient way to recycle waste plastics and tires as high-value chemicals and energy fuels. Pyrolysis has long been considered a clean and productive technology. However, waste polymers are complex mixtures. The co-pyrolysis of the mixture is difficult but essential for energy and material recovery. This study investigated the co-pyrolysis of polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC) and tire waste (TW) using Thermogravimetric (TG) analysis, Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GC/MS), and lab-scale experiments. TG analysis showed that synergistic effect between PVC and TW was the most significant among all the experiments. In the lab-scale experiments, the interaction of PE/PVC and PE/TW improved olefin yield due to the synergistic effect while aromatics formation was promoted by PS/TW. The quality of the pyrolysis gas of PVC/TW was extremely high in the aspect of H2 concentration. However, the component distribution of co-pyrolysis oil of PVC/TW revealed no evident synergistic effect in the micro-scale experiment. Finally, the possible reaction pathways were proposed to get a better understanding of co-pyrolysis. Our study provided theoretical guidance for mixed polymer co-pyrolysis and product regulation.