Experimental study on chemical structure and wetting influence of imidazole ionic liquids on coal

Chen, Xi; Gao, Jiahui; Deng, Cunbao; Ge, Shaocheng; Fan, Chaonan; Zhang, Wei

doi:10.1016/j.fuel.2022.125545

Cited by 26 publications

(19 citation statements)

References 43 publications

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“…The variation of functional group class and proportion and in the microstructure was one of the main factors affecting coal wettability . The effect of the percentages of aliphatic hydrocarbons and oxygen-containing functional groups on the contact angle under the action of SL is displayed in Figure a,b.…”

Section: Resultsmentioning

confidence: 99%

“…From the above, the inconsistent influence trend of the functional groups in the hydroxyl and aromatic structures on the contact angle could be inferred. Alternatively, SL had little impact on the content of hydroxyl structures and aromatic structures. , Therefore, the relations between the contact angle and the subfunctional groups contained in the hydroxyl and aromatic structures were discussed separately.…”

Section: Resultsmentioning

confidence: 99%

“…Alternatively, SL had little impact on the content of hydroxyl structures and aromatic structures. 55,64 Therefore, the relations between the contact angle and the subfunctional groups indicating that the change trend of contact angle with the three was not obvious. Theoretical Analysis.…”

Section: Influence Of Sl On Particle Size Distribution and Wettabilit...mentioning

confidence: 96%

“…From these results, it can be inferred that SL achieved wettability regulation by agglomerating fine coal dust and dissolving large coal dust, which was consistent with the results of Zhang et al 54 In previous studies, curve fitting was widely used to explore the relationship between two sets of data. 55,56 By connecting a series of points on the plane with a smooth curve, this curve had countless possibilities; therefore, there were various fitting methods. The Excel can be used for curve fitting to observe the intrinsic relationship between contact angle and characteristic particle size in this study.…”

Section: Influence Of Sl On Particle Size Distribution and Wettabilit...mentioning

confidence: 99%

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Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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Green biosurfactants are emerging as a promising area of research. However, there is a limited focus on the adsorption and wetting characteristics of biosurfactants on coal dust. This study explores the effects of sophorolipid (SL) biosurfactants on the microstructure and wettability of different coalification degree coal. The microstructure parameters of SL adsorbed on coal dust were measured using a surface tensiometer, contact angle analyzer, and particle size analyzer. The results indicate that SL has the lowest critical surface tension, leading to a 9.25°decrease in the contact angle for low-rank bituminous coal (YZ-LRBC). Furthermore, SL significantly altered the particle size distribution of lignite (NM-LC) and YZ-LRBC. The pore size structure of SL-infiltrated coal dust was quantified using a specific surface area analyzer, revealing a decrease in the specific surface area and an increase in the average pore size. The infrared analysis demonstrated that SL permeation significantly increased the percentage of hydrophilic functional groups (hydroxyl structures) while reducing the hydrophobic functional groups (aliphatic hydrocarbon and aromatic structure). Based on the measured microstructure parameters, a regression equation for contact angle was established: [contact angle (°)] = 73.800 − 0.860 × [D10 (nm)] + 4.280 × [specific surface area (m 2 /g)]. Notably, the characteristic particle size D10 had a significant negative effect on the contact angle, while the specific surface area had a significant positive effect. These findings provide a theoretical foundation for the application of biosurfactants in water injection to reduce dust and improve the wetting efficiency.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of Sl On Particle Size Distribution and Wettabilit...mentioning

confidence: 96%

Section: Influence Of Sl On Particle Size Distribution and Wettabilit...mentioning

confidence: 99%

See 2 more Smart Citations

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Wang,

Zheng,

Jiang

et al. 2023

Langmuir

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show abstract

“…It is reported that the extraction capacity of IL is not only related to coal species and extraction conditions, but also affected by its own hydrogen bond basicity. 20,21 The influence order of inorganic anions on hydrogen bond basicity is…”

Section: Introductionmentioning

confidence: 99%

1‐Butyl‐3‐methylimidazolium chloride involved in sequential extraction of lignite to separate group components and its effect on functional groups of residues

Liang

Zhao

Cui

et al. 2023

J of Chemical Tech & Biotech

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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 C al O, C al N, C al 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 chromatographymass 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.

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Effect of alkyl glucoside concentration on functional group structure and adsorption characteristics of anthracite

Zuo,

Chen,

Wang

et al. 2024

J Mol Model

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Experimental study on chemical structure and wetting influence of imidazole ionic liquids on coal

Cited by 26 publications

References 43 publications

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

Effect of Sophorolipid Adsorption on the Coal Microstructure: Experimental and Wettability Mathematical Model Discussion

1‐Butyl‐3‐methylimidazolium chloride involved in sequential extraction of lignite to separate group components and its effect on functional groups of residues

Effect of alkyl glucoside concentration on functional group structure and adsorption characteristics of anthracite

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