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• W4376140179 abstract "BACKGROUND In view of the low economic benefit for direct utilization of lignite, the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) has been used to extract Inner Mongolia lignite (IML) in order to efficiently separate lignite, develop the technology for clean and value-added utilization of lignite, and alleviate the enormous pressure of ecological environment pollution. Subsequently, sequential extraction of IML by [Bmim]Cl/N-methyl-2-pyrrolidone (NMP), acetonitrile and ether was employed to separate group components in lignite. RESULTS Functional group results show that hydrogen bonds of IML including OHether, COOH dimers and SHN, and weak covalent bonds such as CalO, CalN, CalS and SS, can be cleaved by [Bmim]Cl. Extraction experiments using mixed solvents of [Bmim]Cl and NMP or water indicate that the synergistic effect of NMP and [Bmim]Cl plays a vital role in increasing lignite extraction yield, but for water an opposite effect is observed. Importantly, the group components extracted by [Bmim]Cl/NMP and consecutively by acetonitrile and ether show a clear difference in composition according to gas chromatography–mass spectrometry. Specifically, polycyclic aromatic hydrocarbons and long-chain alkanes are present in the acetonitrile phase, with relative content of 8% and 88%, respectively, while most of esters, aliphatic acids and phenols are dissolved in ether with proportions of 35.24%, 35.53% and 16.57%, respectively. CONCLUSION This work demonstrates that sequential extraction of lignite by [Bmim]Cl/NMP, acetonitrile and ether may provide new insights for the separation of group components and clean utilization of lignite in industry. © 2023 Society of Chemical Industry (SCI)." @default.
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• W4376140179 date "2023-05-23" @default.
• W4376140179 modified "2023-09-26" @default.
• W4376140179 title "<scp>1‐Butyl</scp>‐3‐methylimidazolium chloride involved in sequential extraction of lignite to separate group components and its effect on functional groups of residues" @default.
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• W4376140179 doi "https://doi.org/10.1002/jctb.7425" @default.
• W4376140179 hasPublicationYear "2023" @default.
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