Microwave-assisted extraction of Xianfeng lignite in 1-butyl-3-methyl-imidazolium chloride

Lei, Zhiping; Wu, Lian; Zhang, Yanqiu; Shui, Hengfu; Wang, Zhicai; Pan, Chunxiu; Li, Haiping; Ren, Shibiao; Kang, Shigang

doi:10.1016/j.fuel.2011.12.006

Cited by 47 publications

(23 citation statements)

References 15 publications

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“…The above result clearly shows that extraction temperature significantly affects the dissolution of lignite with EMIA. This phenomenon is consistent with the results of XL dissolution in BMIC [5]. Our previous studies showed that the extract yield of XL at this temperature without the addition of ILs is very low [5].…”

Section: Extraction Behavior Of XL With Emiasupporting

confidence: 92%

“…This phenomenon is consistent with the results of XL dissolution in BMIC [5]. Our previous studies showed that the extract yield of XL at this temperature without the addition of ILs is very low [5]. The above results clearly show that ILs have high extraction ability for lignite.…”

Section: Extraction Behavior Of XL With Emiasupporting

confidence: 91%

“…Our previous study showed that the extract yields of coals with BMIC vary with the ranks of coals [5]. For different lignites, the extract yield of lignites with BMIC is different.…”

Section: Effect Of Lignite Type On the Extract Yield Of Lignites Withmentioning

confidence: 98%

“…Also we had found that BMIC has high performance on the dissolution of Xianfeng lignite (XL) [5,6]. The effect of the chemical structure of anions and cations of ILs on their dissolving capability for lignite had also been studied [7].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the chemical structure of anions and cations of ILs on their dissolving capability for lignite had also been studied [7]. Among the ILs studied, BMIC exhibited the best dissolving capability that up to 80% extract yield of XL can be obtained by heating at 200°C [5]. However, the relatively high melting points and viscosities of ILs containing chloride anion possibly limit their practical application in lignite processing.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution of lignite in ionic liquid 1-ethyl-3-methylimidazolium acetate

Lei

Cheng

Zhang

et al. 2015

Fuel Processing Technology

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Section: Extraction Behavior Of XL With Emiasupporting

confidence: 92%

Section: Extraction Behavior Of XL With Emiasupporting

confidence: 91%

“…Our previous study showed that the extract yields of coals with BMIC vary with the ranks of coals [5]. For different lignites, the extract yield of lignites with BMIC is different.…”

Section: Effect Of Lignite Type On the Extract Yield Of Lignites Withmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dissolution of lignite in ionic liquid 1-ethyl-3-methylimidazolium acetate

Lei

Cheng

Zhang

et al. 2015

Fuel Processing Technology

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Ionic liquids for coal dissolution, extraction and liquefaction

Zhao

Franklin

2020

J of Chemical Tech & Biotech

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Coal is the most abundant fossil fuel. Direct combustion of low‐ and medium‐rank coals causes alarming environmental impacts. Therefore, it is crucial for coal to undergo pretreatments before its efficient utilization [such as coal to liquid (CTL) processes]. Conventional pretreatment methods suffer from several limitations including the use of volatile organic solvents, environmental hazards, strong reaction conditions (e.g. high temperature and pressure), consumption of large quantities of nonrecoverable chemicals (e.g. bases used in aqueous alkaline digestion), or being only effective for specific coals. On the other hand, coal pretreatment by nonvolatile ionic liquids (ILs) could lead to partial coal dissolution/swelling and structure disruption, which is a critical step before coal liquefaction, hydrogenation, pyrolysis or the inhibition of oxidation/combustion. In addition, ILs are suitable solvents for extracting sulfur compounds from coal, asphaltenes from Direct Coal Liquefaction Residues (DCLR) and phenolic compounds from coal tar. This review will discuss these aspects of coal pretreatments by ILs, and identify how ILs could lead to a cleaner and more efficient utilization of coal resources. © 2020 Society of Chemical Industry

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Functionalized ionic liquids for lignite dissolution and treatment

Franklin

Larm

Baker

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: As a low-rank coal, lignite (frequently referred to as 'brown coal') has a high latent moisture content and low energy density and thus has low value as a solid fuel, often being burned at power stations close to where it is mined. For this reason, an effective pretreatment is essential to the better utilization of low-rank coal for energy and materials. Ionic liquids (ILs) are alternatives to conventional volatile organic solvents for pretreating coal due to their tailorable structures and physical properties, as well as their ability to partially dissolve/swell coal components. This study aimed to rationally design ionic liquids having a high hydrogen-bond basicity, based on the acetate anion, paired with ether-functionalized cations (especially the lessexpensive piperidinium) for lignite dissolution and treatment. RESULTS: Lignite treated by these functionalized ionic liquids at 105 °C led to the dissolution of 15.7-24.5 wt% lignite with a concomitant increase in coal aromaticity and rank, a reduction in coal decomposition residues, and the production of smaller and more uniform particles. The ether-functionalized N-(2-ethoxyethyl)-N-methylpiperidinium acetate is a particularly attractive alternative to conventional imidazolium ILs due to its lower cost, high hydrogen-bond basicity, and a strong capability for improving the coal aromaticity.CONCLUSION: Our results have demonstrated that pretreatment with functionalized ionic liquids can improve the coal aromaticity and rank, decrease coal decomposition residues, and yield smaller and more uniform particles, which enables a better utilization of low-rank coal for fuel and materials.

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Microwave-assisted extraction of Xianfeng lignite in 1-butyl-3-methyl-imidazolium chloride

Cited by 47 publications

References 15 publications

Dissolution of lignite in ionic liquid 1-ethyl-3-methylimidazolium acetate

Dissolution of lignite in ionic liquid 1-ethyl-3-methylimidazolium acetate

Ionic liquids for coal dissolution, extraction and liquefaction

Functionalized ionic liquids for lignite dissolution and treatment

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