Interaction and characteristics of furfural residues and polyvinyl chloride in fast co-pyrolysis

Abstract

This study investigated the interaction between the furfural residue and polyvinyl chloride co-pyrolysis using an infrared heating method. Various analytical techniques including production distribution analysis, thermal behavior, pyrolysis kinetic, simulated distillation and gas chromatography-mass spectrography (GCMS), and X-ray photoelectron spectroscopy were utilized to elucidate the pyrolysis characterization and reaction mechanism during the co-pyrolysis. Initially, the yield of co-pyrolysis oil increased from 35.12% at 5 °C·s^–1 to 37.70% at 10 °C·s^–1, but then decreased to 32.07% at 20 °C·s^–1. Kinetic and thermodynamic parameters suggested non-spontaneous and endothermic behaviors. GCMS analysis revealed that aromatic hydrocarbons, especially mono- and bi-cyclic ones, are the predominant compounds in the oil due to the presence of H radicals in polyvinyl chloride, suggesting an enhancement in oil quality. Meanwhile, the fixed chlorine content increased to 65.11% after co-pyrolysis due to the interaction between inorganic salts in furfural residues and chlorine from polyvinyl chloride.

Graphical abstract

Keywords

infrared heating / pyrolysis oil / polyvinyl chloride / chlorine / co-pyrolysis

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Competing interests

The authors declare that they have no competing interests.

Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant Nos. 52104245 and 22178123); the National Natural Science Foundation of Chongqing (Grant Nos. cstc2021jcyj-msxmX0099, 2021XM3073, and 2019LY41). The deepest gratitude goes to the Analytical and Testing Center of Chongqing University.

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2024 Higher Education Press