Obtaining needle coke from coal liquefaction residue

Cheng, Xuewu; Li, Guoning; Peng, Yaoli; Song, Shulei; Xinxin, Shi; Wu, Jianjun; Xie, Jun; Zhou, Min; Hu, Guangzhou

doi:10.1007/s10553-012-0379-3

Cited by 18 publications

(16 citation statements)

References 12 publications

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“…Research of the coal thermal dissolution processes to produce coal-tar pitch-like products was carried out in a number of papers by various authors (Shkoller and Proshunin, 2008;Cheng et al, 2012). It was determined that hard coals at the middle stage of metamorphism are most suitable for coal thermal dissolution processes that aim to produce coal-tar pitchlike products (Rahman et al, 2013;Takanohashi et al, 2008a;Sharma et al, 2008a).…”

Section: Introductionmentioning

confidence: 99%

“…It is shown that Hypercoal has good ductile and sintering properties with a softening point of 240 to 270°C. Apart from the designated use as an environmentally friendly fuel (Sharma et al, 2008a;, it can be used as a coking additive to coking charge to get needle coke (Cheng et al, 2012), other carbon materials (Roberto et al, 2004). Mono-and polycyclic aromatic hydrocarbons and their mixtures with different active additives are mostly used as solvents for coal thermal dissolution (Shui et al, 2013;Yoshida et al, 2004;CAERNCLLC, 2005;Miura et al, 2004), as well as various low-boiling solvents, which under reaction conditions are in the supercritical gas state (Roberto et al, 2004;Torrente and Galan, 2010;Sun et al, 2014;Sangon et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Kuznetsov¹,

Marakushina²,

Kazbanova³

et al. 2016

American Journal of Applied Sciences

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The process of thermal dissolution of medium metamorphosed coals in anthracene oil to produce an alternative pitch binder was studied. The process was carried out at temperatures from 350 to 400°C and pressure not higher than 2.5 MPa, without the use of hydrogen and catalysts. It was determined that during thermal dissolution hard coal of gaseous-fat grade demonstrated a higher activity compared with less metamorphosed gaseous coal. Under optimal conditions at a temperature of 350-380°C yields of pitch tar containing product are 63-75%. With regard to their composition and the main technical characteristics the isolated pitches are at the level in the middle between the coal-tar and oil pitches. Based on the yield data analysis, technical and environmental characteristics of the isolated pitch products a conclusion was made on the prospects of thermal dissolution process as an alternative method for preparing extractive pitch-a substitute for coal-tar pitch produced by coking process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Kuznetsov¹,

Marakushina²,

Kazbanova³

et al. 2016

American Journal of Applied Sciences

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“…The polycyclic aromatic nature of coals is a key consideration in making coals an attractive feedstock for pitch-like products. In addition to conventional transportation fuels use, the non-volatile aromatic liquid residues could be used as a feedstock for non-fuel applications, for pitch production in particular (Hu et al, 1998;Cheng et al, 2012;Rahman et al, 2013). The problems which limit the efficiency of current coal conversion processes are not necessary amenable to a solution using conventional solvents, or other established chemical conversion concepts.…”

Section: Introductionmentioning

confidence: 99%

Study of Supercritical Coal Extraction in Toluene Containing Fluids

Kuznetsov¹,

Kolesnikova²,

Кузнецова³

et al. 2016

American Journal of Applied Sciences

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Abstract:The conversion of brown coals and sapropelic coal in toluene containing mixtures with co-solvents (water, ethanol and tetralin) was studied under sub-and supercritical conditions within the temperature range of 375-550°C and at pressures from 7 to 40 MPa. It was found that the extent of coal extraction in the toluene solvent medium, at 400°C, was significantly increased by the addition of small amounts of hydrogen-donor tetralin or ethanol co-solvents. The extract yield from sapropelic coal reached 79-83%, with the gas yield being small. The effect of process variables on extract yields under sub-and supercritical conditions was monitored. Coal extraction in the toluene-tetralin mixtures was found to depend mainly on the hydrogen donor ability of the tetralin co-solvent irrespective of sub-or supercritical toluene states. According to the composition, the bitumen extracted from coals can be used as a feedstock for pitch production. In the water containing mediums, aside from coal liquefaction, coal methanation, hydrolysis and oxidation reactions occurred resulting in the generation of large amounts of methane, hydrogen and carbon dioxide.

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“…Active research on extractive pitches is underway in China, the United States, and Japan [13][14][15][16][17]. The Japanese technology for the thermal dissolution of subbituminous and bituminous coal in the production of ash-free HyperCoal has undergone the most development [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Thermal Dissolution of Coking Coals in the Anthracene Fraction of Coal Tar

et al. 2018

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The thermal dissolution of two samples of 1GZhR and ZhR coal in the anthracene fraction of coal tar is studied. The yield of quinoline-soluble products increases considerably in the temperature range of coal softening. Optimal thermal-dissolution conditions are determined for selective production of quinoline-soluble pitch-like products. At 350-380°C, the yield of quinoline-soluble products is 70-73% after 1-2 h. The yields of the distillate fraction and the gas are 0.9% and 0.2%, respectively. The ash-free pitch-like product is a plastic mass with a softening temperature of 76-81°C. It consists mainly of polycyclic aromatic hydrocarbons with a few short alkyl substituents in the aromatic rings. The spatial structure mainly includes poorly structured polycyclic aromatic molecules of the γ component. The proportion of relatively ordered graphitelike packets is 31-37%. Each packet contains five stacked polycyclic aromatic molecules of diameter 17 Å. In terms of its composition and plasticity, the product is suitable as a source of alternatives to coal pitch.

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Obtaining needle coke from coal liquefaction residue

Cited by 18 publications

References 12 publications

Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Study of Supercritical Coal Extraction in Toluene Containing Fluids

Thermal Dissolution of Coking Coals in the Anthracene Fraction of Coal Tar

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