Functional groups of sequential extracts and corresponding residues from Hefeng sub-bituminous coal based on FT-IR analysis

WANG Yue; MA Ya-ya; MO Wen-long; GONG Wen-tao; MA Feng-yun; WEI Xian-yong; FAN Xing; ZHANG Shu-pei

doi:10.1016/S1872-5813(21)60055-5

Volume 49 Issue 7

Jul. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(7): 890-901

WANG Yue, MA Ya-ya, MO Wen-long, GONG Wen-tao, MA Feng-yun, WEI Xian-yong, FAN Xing, ZHANG Shu-pei. Functional groups of sequential extracts and corresponding residues from Hefeng sub-bituminous coal based on FT-IR analysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(7): 890-901. doi: 10.1016/S1872-5813(21)60055-5

Citation:

WANG Yue, MA Ya-ya, MO Wen-long, GONG Wen-tao, MA Feng-yun, WEI Xian-yong, FAN Xing, ZHANG Shu-pei. Functional groups of sequential extracts and corresponding residues from Hefeng sub-bituminous coal based on FT-IR analysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(7): 890-901. doi: 10.1016/S1872-5813(21)60055-5

Citation:

WANG Yue, MA Ya-ya, MO Wen-long, GONG Wen-tao, MA Feng-yun, WEI Xian-yong, FAN Xing, ZHANG Shu-pei. Functional groups of sequential extracts and corresponding residues from Hefeng sub-bituminous coal based on FT-IR analysis[J]. Journal of Fuel Chemistry and Technology, 2021, 49(7): 890-901. doi: 10.1016/S1872-5813(21)60055-5

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Functional groups of sequential extracts and corresponding residues from Hefeng sub-bituminous coal based on FT-IR analysis

doi: 10.1016/S1872-5813(21)60055-5

WANG Yue^1
,,
MA Ya-ya¹,
MO Wen-long^{1
,
,},
GONG Wen-tao¹,
MA Feng-yun¹,
WEI Xian-yong^{1, 2
,
,},
FAN Xing^{1, 3},
ZHANG Shu-pei⁴

1.
Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uyghur Autonomous Region), College of Chemical Engineering, Xinjiang University, Urumqi 830046, China
2.
Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
3.
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
4.
Xinjiang Yihua Chemical Industry Co., Ltd., Changji 831700, China.

Funds: The project was supported by the High-Level Talents Project from Xinjiang University, the Tianchi Project for Introducing High-Level Talents to Xinjiang Uyghur Autonomous Region (China) and the Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education.

Received Date: 2020-12-02
Rev Recd Date: 2021-02-09

Available Online: 2021-03-08

Publish Date: 2021-07-15

Abstract

Abstract

Petroleum ether, carbon disulfide, methanol, acetone, and acetone/carbon disulfide were selected as solvents for ultrasonic-assisted extraction of acid-washed Hefeng sub-bituminous coal. The extract and residue were identified as E_i and R_i (i = 1, 2, 3, 4, 5) for each stage. By FT-IR characterization of E_i and R_i, molecular structure of the extracted product was analyzed by means of segmented peak fitting. The results show that the hydroxy hydrogen bond in the fifth-order extract is dominated by self-associating hydroxy hydrogen bond; in aliphatic substances, only E₃ was dominated by aliphatic −CH₃ and asymmetric −CH₂ stretching vibration, while the other extracts were dominated by symmetric and asymmetric −CH₂ stretching vibration. E₁ is dominated by symmetric bending vibration of aliphatic chain terminal −CH₃ and asymmetric deformation vibration of −CH₃ and −CH₂, indicating that petroleum ether mainly break the easily dissociated chemical bonds in coal samples; CS₂ dissolve a higher proportion of aromatic structure containing aliphatic side chains. The functional groups contained in the five residues are the same, indicating that the main structure of the coal sample is not changed due to the stepwise extraction. Extraction has an obvious influence on aromatic structure and hydroxy hydrogen bond in the residue. Aromatic structures change from di-substituted benzene dominant to tetra-substituted benzene dominant. Before extraction, the hydroxyl hydrogen bond in the acid-washed coal sample was dominated by hydroxyl ether hydrogen bonds, and after extraction, it was transformed into self-associated hydroxyl ones. In addition, sequential extraction has little effect on oxygen-containing functional groups and aliphatic functional groups. By comparing structural parameters, it is found that E₁, E₃, and R₅ has a higher degree of aromatic condensation, and E₄ has a longer straight-chain and less branched chain.
- coal structure,
- FT-IR spectroscopy,
- functional groups,
- extract residue

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References(32)

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