Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking

doi:10.1016/j.cjche.2024.09.025

中国化学工程学报 ›› 2025, Vol. 77 ›› Issue (1): 93-101.DOI: 10.1016/j.cjche.2024.09.025

Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking

Xiangchun Liu, Ying Chen, Huan Song, Ping Cui

Anhui Province Key Laboratory of Coal Clean Conversion & High Valued Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243032, China

收稿日期:2024-06-24 修回日期:2024-09-02 接受日期:2024-09-05 出版日期:2025-01-28 发布日期:2024-11-12
通讯作者: Xiangchun Liu,E-mail:chunliu7@ahut.edu.cn;Ping Cui,E-mail:cokecp@ahut.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (22308006 and 22278001) and the Natural Science Foundation of Anhui Provincial Education Department (KJ2021A0407).

Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking

Xiangchun Liu, Ying Chen, Huan Song, Ping Cui

Anhui Province Key Laboratory of Coal Clean Conversion & High Valued Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243032, China

Received:2024-06-24 Revised:2024-09-02 Accepted:2024-09-05 Online:2025-01-28 Published:2024-11-12
Contact: Xiangchun Liu,E-mail:chunliu7@ahut.edu.cn;Ping Cui,E-mail:cokecp@ahut.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (22308006 and 22278001) and the Natural Science Foundation of Anhui Provincial Education Department (KJ2021A0407).

摘要/Abstract

摘要： Polystyrene (PS) waste was depolymerized using a low-temperature pyrolysis treatment (LTPT) to increase its caking index. The mechanism of caking index modification was revealed by using Fourier transform infrared spectroscopy, thermogravimetric (TG) analysis, pyrolysis-gas chromatography with mass spectrometric detection, and solid-state ¹³C nuclear magnetic resonance spectroscopy. The crucible coal-blending coking tests were carried out using an industrial coal mixture and the treated-PS with the highest caking index (PS300) or raw PS. Some properties of the resultant cokes were also analyzed. It was demonstrated that the caking index of PS dramatically increased by LTPT; however, exceeding 300 ℃ did not yield any benefit. The caking index increased due to the formation of the caking components, whose molecules are medium in size, caused by LTPT. Additionally, the coke reactivity index of the coke obtained from the mixture containing PS300 decreased by 5.1% relative to that of the coke made from the mixture with PS and the coke strength after reaction index of the former increased by 7.3% compared with that of the latter, suggesting that the ratio of depolymerized PS used for coal-blending coking could increase relative to that of PS.

关键词: Polystyrene, pyrolysis, Caking index, Coking property

Abstract: Polystyrene (PS) waste was depolymerized using a low-temperature pyrolysis treatment (LTPT) to increase its caking index. The mechanism of caking index modification was revealed by using Fourier transform infrared spectroscopy, thermogravimetric (TG) analysis, pyrolysis-gas chromatography with mass spectrometric detection, and solid-state ¹³C nuclear magnetic resonance spectroscopy. The crucible coal-blending coking tests were carried out using an industrial coal mixture and the treated-PS with the highest caking index (PS300) or raw PS. Some properties of the resultant cokes were also analyzed. It was demonstrated that the caking index of PS dramatically increased by LTPT; however, exceeding 300 ℃ did not yield any benefit. The caking index increased due to the formation of the caking components, whose molecules are medium in size, caused by LTPT. Additionally, the coke reactivity index of the coke obtained from the mixture containing PS300 decreased by 5.1% relative to that of the coke made from the mixture with PS and the coke strength after reaction index of the former increased by 7.3% compared with that of the latter, suggesting that the ratio of depolymerized PS used for coal-blending coking could increase relative to that of PS.

Key words: Polystyrene, pyrolysis, Caking index, Coking property

Xiangchun Liu, Ying Chen, Huan Song, Ping Cui. Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking[J]. 中国化学工程学报, 2025, 77(1): 93-101.

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Modification mechanism of caking property of polystyrene waste using low-temperature pyrolysis and its use in coal-blending coking

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