Study on the stability of hydro-liquefaction residue of Shenfu sub-bituminous coal

Wang, Zhicai; Xue, Wenting; Zhu, Jing; Chen, Ensheng; Pan, Chunxiu; Kang, Shigang; Lei, Zhiping; Ren, Shibiao; Shui, Hengfu

doi:10.1016/j.fuel.2016.05.042

Cited by 17 publications

(2 citation statements)

References 28 publications

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“…Research studies have shown that residues produced during coal liquefaction contain a significant amount of organic matter. The high concentrations of carbon and hydrogen in these residues indicate a possibility for their utilization for pyrolysis and gasification. − …”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Uwaoma¹,

Strydom²,

Matjie³

et al. 2019

Energy Fuels

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The lighter density (<1.5 g/cm3) fractions produced from two waste coals sampled from the waste coal disposal sites at thermochemical plants situated in South Africa were used as feed materials for liquefaction with tetralin. The liquefaction residues from the lighter density and untreated lighter density fractions were used in pyrolysis experiments. Pyrolysis of the lighter density fractions was carried out in a Fischer Assay oven at 750 and 920 °C under an argon atmosphere. Advanced analytical techniques (gas chromatography–mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy) were employed to characterize the pyrolysis products. Also, the lighter density fractions, liquefaction residues, and their chars were examined using conventional and advanced analytical techniques. The pyrolysis char yields of the liquefaction residues ranged between 74% and 76%, and those of the coal float fractions ranged between 67.0 and 71.5%. Gas pyrolysis yields ranged between 16.0% and 20.0% for the residues and between 14.5% and 18.4% for the lighter density fractions, while the pyrolytic water and the tar products of the lighter density fractions were slightly higher than those of the liquefaction-derived residues. The proton NMR analysis of the tars from the residues shows marginally higher amounts of aromatic protons than those of the lighter density fractions. Chars which were generated after pyrolysis of the liquefaction-derived residues show higher porosity values than those from the pyrolysis of the lighter density fractions. The differences in the porosities are attributed to the opening of pores and extraction of some lower molecular mass aliphatic species from the coal matrix during liquefaction. The pyrolysis products distribution and characterization of the products showed that the residues (waste material) generated after tetralin liquefaction of the float fractions from the float–sink experiments of waste coals may be utilized for thermochemical processes (pyrolysis).

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Section: Introductionmentioning

confidence: 99%

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Uwaoma¹,

Strydom²,

Matjie³

et al. 2019

Energy Fuels

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“…Direct coal liquefaction residue (DCLR) is derived from the solvent extraction of coal liquefaction product and is mainly composed of mineral, residual catalyst, unreacted coal, and heavy components (heavy oil, asphaltene, and preasphaltene). − DCLR is the main byproduct in the process of the direct coal liquefaction industry, and its content was about 30% to the raw coal (dry base). − Whether the liquefaction residue could be effectively utilized is related to the economy and resource conversion efficiency of the whole process of coal liquefaction. At present, the utilization of DCLR is mostly focus on pyrolysis, gasification, and hydro-liquefaction, − among which pyrolysis is not only the initial stage in the thermal conversion process of DCLR but also an important way to recover value-added chemicals, asphaltene, and heavy oil from liquefaction residue .…”

Section: Introductionmentioning

confidence: 99%

Effect of Swelling Treatment by Organic Solvent on the Structure and Pyrolysis Performance of the Direct Coal Liquefaction Residue

Wang

et al. 2020

Energy Fuels

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Five organic solvents, N-methyl-2-pyrrolidone (NMP), cyclohexanone (CYC), N,N-dimethylformamide (DMF), acetonitrile (ACN), and toluene (TOL) were used to treat Shenhua direct coal liquefaction residue (DCLR) by swelling processes. The treated residues were characterized by swelling degree (Q), SEM, FTIR, TG-DTG, and Py-GC/MS methods. The effect of swelling treatment on the swelling properties, surface morphology, functional group distribution, and pyrolysis performance of the residues was investigated. Swelling results showed that the swelling effect with different solvents on each residue was different and that the swelling degree of the residue treated by NMP was high, 2.4. Swelling treatment could significantly change the surface morphology and pore structure of DCLR, resulting in the increase of pores in the residue. FTIR spectra proposed that swelling treatment could effectively break the hydrogen bonds in residue and change the abundance of oxygen-containing functional groups. TG-DTG profiles demonstrated that the swelling procedure could increase the weight loss and pyrolysis rate of the residue, and the pyrolysis activation energy in high-temperature region (≥360 °C) was obviously reduced, while the energy in the low-temperature region (120–360 °C) was increased. Py-GC/MS proposed that the swelling pretreatment could change the pyrolysis product distribution of the residue, with the species of the products decreased, and that ketones and arenes compounds were the main products.

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Chemical transformation of inherent sodium and calcium species during direct liquefaction of two typical lignites rich in alkali and alkaline earth metals

Cao

Meng

et al. 2017

Fuel

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Study on the stability of hydro-liquefaction residue of Shenfu sub-bituminous coal

Cited by 17 publications

References 28 publications

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

Effect of Swelling Treatment by Organic Solvent on the Structure and Pyrolysis Performance of the Direct Coal Liquefaction Residue

Chemical transformation of inherent sodium and calcium species during direct liquefaction of two typical lignites rich in alkali and alkaline earth metals

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