Extraction and thermal dissolution of Piliqing subbituminous coal

Wang, Yanan; Wei, Xian‐Yong; Li, Zhan-Ku; Yan, Hong-Lei; Wang, Tie-Min; Zhang, Yangyang; Zong, Zhi‐Min; Ma, Fengyun; Liu, Jingmei

doi:10.1016/j.fuel.2017.03.081

Cited by 36 publications

(9 citation statements)

References 30 publications

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“…No significant dependence was found for Cyp AFCs, which showed ratios of 0.4–0.7. The fuel ratios for the Raws were 0.79 (Eco), 1.07 (Cyp), 1.60 (Dra), and 3.24 (Hai), which are generally larger than those for the corresponding AFCs because the thermal extraction dissolved relatively small molecules in the Raws. , The content of volatile matter that was relatively small and readily reactive was higher in the AFCs made of LRCs than those made of HRCs Thus, higher amounts of fixed carbon were measured for Hai and Dra AFCs (50–65 wt %), as they inherited the heavy carbon compounds from the Raws.…”

Section: Resultsmentioning

confidence: 97%

Steam Gasification of Thermally Extracted Ash-Free Coals: Reactivity Effects Due to Parent Raw Coals and Extraction Solvents

et al. 2017

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Utilization of coal is currently limited to coal-fired power plants and iron smelting, partly because of the incombustible ash in coal and the inability of existing technologies to modify its properties. This work investigates whether the gasification behavior of ash-free coals (AFCs) can be modified. Sixteen different AFCs were prepared using variously ranked coals (Eco, Cyprus, Drayton, and Hail Creek) and extraction solvents with different polarities (N-methyl-2-pyrrolidone, ethylenediamine, 1-methylnaphthalene, and tetralin). Next, the reactivities of the AFCs in steam gasification at 800 °C were tested, and the results are discussed taking into consideration their compositional differences. A combination of low-rank coals and polar solvents produces reactive AFCs that can be catalytically gasified under mild conditions. In contrast, AFCs extracted using nonpolar solvents are less reactive and possibly applicable as a carbon electrode precursor. In short, the properties of AFCs can be changed to some extent using the appropriate combination of coals and extraction solvents.

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Section: Resultsmentioning

confidence: 97%

Steam Gasification of Thermally Extracted Ash-Free Coals: Reactivity Effects Due to Parent Raw Coals and Extraction Solvents

et al. 2017

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“…While the absorption peak at 1100 cm –1 belonging to aryl ether or/and alkyl ether almost is almost disappeared in HBC AC , meaning that the acid washing process had great influence on the ether bond in coal. 31 The absorption peaks around 1040, 538, and 465 cm –1 are assigned to minerals. 32 It can be seen from Figure 3 that these peaks in HBC AC are vanished, indicating that acid washing can effectively remove minerals from coal.…”

Section: Resultsmentioning

confidence: 99%

Effect of Swelling by Organic Solvent on Structure, Pyrolysis, and Methanol Extraction Performance of Hefeng Bituminous Coal

Wang

et al. 2021

ACS Omega

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N -methyl-2-pyrrolidone (NMP), pyridine (Py), tetrahydrofuran (THF), and tetralin (THN) were used to swell Hefeng acid-washed bituminous coal (HBC AC ). The swelling effect on HBC AC by each solvent is different, among which NMP presented well swelling performance, with a swelling degree of 2.11. FTIR results showed that acid washing and swelling processes presented a marginal effect on HBC, and there was no damage to the macromolecule structure of the coal. TG–DTG profiles of the swollen coals illustrated that the total weight loss of each sample was lower than that of the acid-washing one, while the temperature of the maximum weight loss rate peak was almost unchanged, around 445 °C. Extract yield by methanol followed the order of HBC AC > HBC > HBC AC–NMP (swelled by NMP), showing that acid washing promoted the methanol extraction process, with a higher extract yield of 3.21%, which is twice that of HBC (1.66%).

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“…The C n of YL is 2.34, implying that lots of short-bridged bonds or side chains exist in the carbon skeletal structure of YL. 25,26 Since the σ in YL is 0.38, the average number of substituents on each AR is 2.28. Interestingly, the χ b in each TYL IL/M is ca.…”

Section: Change In Particlementioning

confidence: 99%

Insights into Physicochemical Changes of Yinggemajianfeng Lignite in Co-Solvents of Ionic Liquids and Methanol

Wang

Wei

et al. 2019

Energy Fuels

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Yinggemajianfeng lignite (YL) was subjected to thermal dissolution (TD) in a co-solvent of an ionic liquid (IL, 1-butyl-3-methyl-imidazolium chloride, 1-butyl-3-methylimidazolium tetrafluoroborate, or 1-ethyl-3-methylimidazolium acetate) and methanol at 70 °C. YL and treated YL (TYL) samples were analyzed with a scanning electron microscope (SEM), thermogravimetric analyzer, solid-state 13C nuclear magnetic resonance, and Fourier transform infrared spectrometer. The results show that the yield of soluble portion from each TYL with a co-solvent is much higher than that with the IL alone due to the decrease in the solvent viscosity and increase in the interactions between the IL and YL. The particles in the TYL samples are smaller than those in YL based on the observation with the SEM, and the TYL samples have more mass loss than YL during pyrolysis, suggesting that the TD destroyed the texture and structure of YL to some extent. Compared to YL, the TYL samples have more aliphatic carbons. The physicochemical changes of the TYL samples indicate that the co-solvents are effective for treating coals and the TYL samples are more appropriate for liquefaction and pyrolysis.

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Extraction and thermal dissolution of Piliqing subbituminous coal

Cited by 36 publications

References 30 publications

Steam Gasification of Thermally Extracted Ash-Free Coals: Reactivity Effects Due to Parent Raw Coals and Extraction Solvents

Steam Gasification of Thermally Extracted Ash-Free Coals: Reactivity Effects Due to Parent Raw Coals and Extraction Solvents

Effect of Swelling by Organic Solvent on Structure, Pyrolysis, and Methanol Extraction Performance of Hefeng Bituminous Coal

Insights into Physicochemical Changes of Yinggemajianfeng Lignite in Co-Solvents of Ionic Liquids and Methanol

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