Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N4441][Cl]

doi:10.1016/j.cjche.2024.11.026

Chinese Journal of Chemical Engineering ›› 2025, Vol. 81 ›› Issue (5): 57-63.DOI: 10.1016/j.cjche.2024.11.026

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Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N₄₄₄₁][Cl]

Shixian Fang, Ying Chen, Yutong Qian, Shulin Wang, Xiangchun Liu, Ping Cui

Anhui Province Key Laboratory of Coal Clean Conversion & Low-carbon Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Hefei 243032, China

Received:2024-10-09 Revised:2024-11-13 Accepted:2024-11-27 Online:2025-03-11 Published:2025-05-28
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 (22278001 and 22308006) and the Natural Science Foundation of Anhui Provincial Education Department (KJ2021A0407).

Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N₄₄₄₁][Cl]

Shixian Fang, Ying Chen, Yutong Qian, Shulin Wang, Xiangchun Liu, Ping Cui

Anhui Province Key Laboratory of Coal Clean Conversion & Low-carbon Utilization, School of Chemistry and Chemical Engineering, Anhui University of Technology, Hefei 243032, China

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 (22278001 and 22308006) and the Natural Science Foundation of Anhui Provincial Education Department (KJ2021A0407).

Abstract

Abstract: The effects of different kinds of ionic liquids (ILs) on the caking property of Shenhua long-flame coal (SHLC) were studied. SHLC and its residue after [N₄₄₄₁][Cl] treatment under optimum conditions were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and pyrolysis-gas chromatography and mass-spectrometric analysis (Py-GC/MS). The results showed that the ILs used could extract the poorly-caking components from SHLC, and [N₄₄₄₁][Cl] with C₃H₆O as a solvent exhibited the best effect among the ILs and solvents used. [N₄₄₄₁][Cl] could destroy the H bonds in SHLC, and the structure of the cross-linked macromolecules of SHLC was loosed, leading to the release of the small molecules within the macromolecular framework of SHLC. Additionally, [N₄₄₄₁][Cl] could easily penetrate into the interior of the relaxed SHLC and break the weak covalent bonds (e.g., C—O bonds) of the macromolecules of SHLC. As a result, aromatic hydrocarbons with 3-5 rings and aliphatic side chains, which are the precursor of the poorly-caking components, were formed and were then extracted from SHLC by C₃H₆O. Consequently, [N₄₄₄₁][Cl] treatment could decrease the caking property, thermal ability, and macromolecular size of SHLC.

Key words: Low-rank coal, Ionic liquids, Caking property, Functional groups

摘要： The effects of different kinds of ionic liquids (ILs) on the caking property of Shenhua long-flame coal (SHLC) were studied. SHLC and its residue after [N₄₄₄₁][Cl] treatment under optimum conditions were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and pyrolysis-gas chromatography and mass-spectrometric analysis (Py-GC/MS). The results showed that the ILs used could extract the poorly-caking components from SHLC, and [N₄₄₄₁][Cl] with C₃H₆O as a solvent exhibited the best effect among the ILs and solvents used. [N₄₄₄₁][Cl] could destroy the H bonds in SHLC, and the structure of the cross-linked macromolecules of SHLC was loosed, leading to the release of the small molecules within the macromolecular framework of SHLC. Additionally, [N₄₄₄₁][Cl] could easily penetrate into the interior of the relaxed SHLC and break the weak covalent bonds (e.g., C—O bonds) of the macromolecules of SHLC. As a result, aromatic hydrocarbons with 3-5 rings and aliphatic side chains, which are the precursor of the poorly-caking components, were formed and were then extracted from SHLC by C₃H₆O. Consequently, [N₄₄₄₁][Cl] treatment could decrease the caking property, thermal ability, and macromolecular size of SHLC.

关键词: Low-rank coal, Ionic liquids, Caking property, Functional groups

Shixian Fang, Ying Chen, Yutong Qian, Shulin Wang, Xiangchun Liu, Ping Cui. Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N₄₄₄₁][Cl][J]. Chinese Journal of Chemical Engineering, 2025, 81(5): 57-63.

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Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N₄₄₄₁][Cl]

Mechanism of extracting poorly-caking components from Shenhua long-flame coal using [N₄₄₄₁][Cl]

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