Beneficiation of Indian coals using Ionic Liquids

Bhoi, Sanjukta; Banerjee, Tamal; Mohanty, Kaustubha

doi:10.1016/j.fuproc.2016.05.023

Cited by 19 publications

(6 citation statements)

References 36 publications

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“…38 A different IL, 1-butyl-1-methylpyrrolidinium methylcarbonate ([BMPyr][CH 3 CO 3 ]) was found to dissolve 35% lignite and 47% bituminous coal at 100 °C. 45…”

Section: Resultsmentioning

confidence: 99%

“…Other ILs that have been evaluated for coal treatment include the following: (i) dialcarbs (N,N-dialkylammonium N 0 ,N 0 -dialkylcarbamates) for dissolving 18 45 and (v) amino acid-based IL (choline arginate or choline glycinate) were used to pretreat lignite and bituminous coals at 70 °C for 3 h, yielding considerable particle size reduction, as well as a decreased decomposition temperature for coal, and lower aliphatic carbon, carbonyl group, and sulfur contents. 46 Additionally, a number of functionalized ILs have been evaluated for coal treatment.…”

Section: Introductionmentioning

confidence: 99%

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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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“…38 A different IL, 1-butyl-1-methylpyrrolidinium methylcarbonate ([BMPyr][CH 3 CO 3 ]) was found to dissolve 35% lignite and 47% bituminous coal at 100 °C. 45…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functionalized ionic liquids for lignite dissolution and treatment

Franklin

Larm

Baker

et al. 2021

J of Chemical Tech & Biotech

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“…The swelling degree of HFC H and HFC O was increased to 2.2 and 2.4 and increased by 120 and 140%, respectively. Swelling could not only destroy the noncovalent bond, such as hydrogen bonds, π–π interactions, and van der Waals force, between the small molecule and the macromolecular network but also weaken or destroy the weak covalent bond between the structural units. ,, Thus, the network structure of the coal became loose, and the volume expansion of the coal took place. However, the swelling effect of each ionic liquid on the coal sample is different, with a swelling degree of 2.0–2.4, which is mainly ascribed to the effect of different organic cation length.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Lei et al found that the content of carbonyl and ether bonds in coal increased using [EMIM][H 2 PO 4 ] as a solvent, which could effectively improve the tar yield. Bhoi et al swelled four Indian coals with five ionic liquids. It was discovered that [MTBP][MeSO 4 ] and [BMPYR][CH 3 CO 3 ] showed an obvious destructive effect on the coal structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Swelling with Ionic Liquid on the Molecular Structure and Pyrolysis Behavior of Hefeng Sub-bituminous Coal

et al. 2020

Energy Fuels

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Four ionic liquids, 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]), 1-butyl-3-methylimidazolium acetate ([BMIM][OAc]), 1-hexyl-3-methylimidazolium acetate ([HMIM][OAc]), and 1-octyl-3-methylimidazolium acetate ([OMIM]-[OAc]), were used to swell Hefeng sub-bituminous coal. The effect of swelling on the molecular structure and pyrolysis behavior of the coal was investigated by swelling degree Q, SEM, FTIR, and TG-DTG characterizations. Results showed that swelling degree by different ionic liquid was in the range of 2.0−2.4, with a higher degree of 2.4 for the coal sample swelled by [OMIM][OAc]. The swelling process could destroy the surface morphology and pore structure of the coal and increase and loosen the sample's pore channel. The results of the FTIR analysis revealed that swelling can destroy hydrogen bonds in coal, reduce the relative content of oxygen-containing functional groups, and might increase the relative amount of low-molecular-weight organics. TG-DTG profiles proposed that swelling with ionic liquid could promote weight loss and pyrolysis conversion of the coal and significantly changed its pyrolysis behavior at the temperature of 180−350 °C. The Coats−Redfern results presented that swelling increased the pyrolysis activation energy of the coal at 180−350 °C, while the energy was decreased at 350−550 °C.

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“…The particle size was reduced and more isometric particles were obtained by dispersing raw Indian coal in ionic liquids. Microscopic images of the raw coal indicate irregular shapes and rough surfaces but the shape was not analyzed quantitatively [30]. However, it is well-known that particle shape has a significant influence on the flow behavior of suspensions including non-spherical particles.…”

Section: Introductionmentioning

confidence: 99%

Coke Slurries with Improved Higher Heating Value and Good Processability via Particle Shape Design

et al. 2017

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Coke‐water slurries can be used as biogenic intermediates in conversion of residual biomass into high value fuels such as liquefied petroleum gas or synthetic natural gas. The effect of particle size and shape on the flow behavior of slurries including coke particles obtained from fast pyrolysis was investigated. Particles were shaped in a planetary ball mill and equivalent sphere diameter and circularity were used to characterize size and shape. An increased circularity resulted in a strong decrease in slurry viscosity. Accordingly, a higher mass fraction of particles can be mixed into the slurry, thus, increasing the higher heating value while still preserving good processing properties.

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Beneficiation of Indian coals using Ionic Liquids

Cited by 19 publications

References 36 publications

Functionalized ionic liquids for lignite dissolution and treatment

Functionalized ionic liquids for lignite dissolution and treatment

Effect of Swelling with Ionic Liquid on the Molecular Structure and Pyrolysis Behavior of Hefeng Sub-bituminous Coal

Coke Slurries with Improved Higher Heating Value and Good Processability via Particle Shape Design

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