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<p>Continuous feeding techniques integrated with a liquid heating medium represent a promising approach for converting waste plastics into high-value products. Molten salts have great potential as efficient liquid heating media for the pyrolysis of waste plastics. The present study investigates the pyrolysis of low-density polyethylene (LDPE) assisted by LiCl–KCl molten salt in a continuous feeding process. The distribution of plastic pyrolysis products under different pyrolysis temperatures (440‒590&#xa0;°C), LiCl mass fractions (52‒58 wt%), and feeding rates (18‒30 g/h) was thoroughly evaluated. The results indicate that a temperature of 540&#xa0;°C is crucial for enhancing gas yield and oil quality, as it provides an optimal balance between pyrolysis and volatilization rates. Increasing the LiCl mass fraction may accelerate the pyrolysis rate and can promote secondary cracking, thereby significantly increasing gas yield and producing considerably lighter oil&#xa0;. The highest gas yield of LDPE was 76.70 wt% at a feeding rate of 27 g/h, which was attributed to gas repolymerization predominating over the secondary cracking of light oil. Additionally, the product characteristics of five common plastics—LDPE, high-density polyethylene (HDPE), polypropylene (PP), waste polyethylene (WPE), and waste polypropylene (WPP)—were investigated and showed distinct characteristics. The gas yield of LDPE was higher than that of PP because the isomerization radicals of PP generate light-component oil <i>via</i>&#xa0;cyclization. Furthermore, this system also exhibits excellent performance in handling waste plastics.&#xa0;This work provides guidance for selecting appropriate operating conditions and establishes a theoretical basis for the subsequent large-scale industrial application of molten salt-assisted plastic pyrolysis</p>

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Valorization of Waste Plastics in a Continuous Molten Salt-Assisted Pyrolysis System

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Yibo Wu,
  • Youwei Yang,
  • Dawei Shi,
  • Jie Yu,
  • Yaning Zhang,
  • Leilei Dai,
  • Meisam Tabatabaei,
  • Mortaza Aghbashlo,
  • YanMing Guo,
  • Ruming Pan

摘要

Continuous feeding techniques integrated with a liquid heating medium represent a promising approach for converting waste plastics into high-value products. Molten salts have great potential as efficient liquid heating media for the pyrolysis of waste plastics. The present study investigates the pyrolysis of low-density polyethylene (LDPE) assisted by LiCl–KCl molten salt in a continuous feeding process. The distribution of plastic pyrolysis products under different pyrolysis temperatures (440‒590 °C), LiCl mass fractions (52‒58 wt%), and feeding rates (18‒30 g/h) was thoroughly evaluated. The results indicate that a temperature of 540 °C is crucial for enhancing gas yield and oil quality, as it provides an optimal balance between pyrolysis and volatilization rates. Increasing the LiCl mass fraction may accelerate the pyrolysis rate and can promote secondary cracking, thereby significantly increasing gas yield and producing considerably lighter oil . The highest gas yield of LDPE was 76.70 wt% at a feeding rate of 27 g/h, which was attributed to gas repolymerization predominating over the secondary cracking of light oil. Additionally, the product characteristics of five common plastics—LDPE, high-density polyethylene (HDPE), polypropylene (PP), waste polyethylene (WPE), and waste polypropylene (WPP)—were investigated and showed distinct characteristics. The gas yield of LDPE was higher than that of PP because the isomerization radicals of PP generate light-component oil via cyclization. Furthermore, this system also exhibits excellent performance in handling waste plastics. This work provides guidance for selecting appropriate operating conditions and establishes a theoretical basis for the subsequent large-scale industrial application of molten salt-assisted plastic pyrolysis