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Article

Composition Distribution of the Thermal Soluble Organics from Naomaohu Lignite and Structural Characteristics of the Corresponding Insoluble Portions

1
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources and Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, China
2
Hami Quality and Metrology Testing Institute, Hami 839000, China
3
Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
4
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
5
Xinjiang Energy Co., Ltd., Urumqi 830000, China
*
Authors to whom correspondence should be addressed.
Molecules 2024, 29(12), 2776; https://doi.org/10.3390/molecules29122776
Submission received: 19 March 2024 / Revised: 5 May 2024 / Accepted: 4 June 2024 / Published: 11 June 2024

Abstract

With cyclohexane (CH), benzene (BE), and ethyl acetate (EA) as solvents, Naomaohu lignite (NL, a typical oil-rich, low-rank coal) from Hami, Xinjiang, was thermally dissolved (TD) to obtain three types of soluble organics (NLCH, NLBE, and NLEA) and the corresponding insoluble portions (NLCH-R, NLBE-R, and NLEA-R). Ultimate analysis, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG-DTG), and gas chromatography–mass spectrometry (GC/MS) were used to characterize NL and its soluble and insoluble portions. Results showed that, compared with NL, the C element in NLCH-R, NLBE-R, and NLEA-R increased, while the O element decreased significantly, indicating that thermal dissolution is a carbon enrichment process and an effective deoxidation method. The GC/MS results showed that oxygen-containing organic compounds (OCOCs) are dominant in NLCH, NLBE, and NLEA. NLCH is mainly composed of ketones (11.90%) and esters (19.04%), while NLBE and NLEA are composed of alcohols (12.18% and 2.42%, respectively) and esters (66.09% and 84.08%, respectively), with alkyl and aromatic acid esters as the main components. Among them, EA exhibits significant selective destruction for oxygen-containing functional groups in NL. XPS, FTIR, and TG-DTG results showed that thermal dissolution can not only affect the macromolecular network structure of NL, but also improve its pyrolysis reactivity. In short, thermal dissolution can effectively obtain oxygen-containing organic compounds from NL.
Keywords: naomaohu lignite; thermal dissolution; soluble organics; composition and structural characteristics naomaohu lignite; thermal dissolution; soluble organics; composition and structural characteristics

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MDPI and ACS Style

Zhu, M.; Ma, Y.; Mo, W.; Hao, S.; Wei, X.; Fan, X.; Ren, T.; Ma, K.; Guo, J. Composition Distribution of the Thermal Soluble Organics from Naomaohu Lignite and Structural Characteristics of the Corresponding Insoluble Portions. Molecules 2024, 29, 2776. https://doi.org/10.3390/molecules29122776

AMA Style

Zhu M, Ma Y, Mo W, Hao S, Wei X, Fan X, Ren T, Ma K, Guo J. Composition Distribution of the Thermal Soluble Organics from Naomaohu Lignite and Structural Characteristics of the Corresponding Insoluble Portions. Molecules. 2024; 29(12):2776. https://doi.org/10.3390/molecules29122776

Chicago/Turabian Style

Zhu, Meixia, Yaya Ma, Wenlong Mo, Shihao Hao, Xianyong Wei, Xing Fan, Tiezhen Ren, Kongjun Ma, and Jia Guo. 2024. "Composition Distribution of the Thermal Soluble Organics from Naomaohu Lignite and Structural Characteristics of the Corresponding Insoluble Portions" Molecules 29, no. 12: 2776. https://doi.org/10.3390/molecules29122776

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