Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Kuznetsov, Petr; Marakushina, E. N.; Kazbanova, A. V.; Kolesnikova, S. M.; Кузнецова, Л. И.; Buryukin, F. A.; Kositcyna, Svetlana Sergeevna

doi:10.3844/ajassp.2016.7.13

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…The results of the thermal dissolution of bituminous and sub-bituminous coals to produce the extractive pitches have been reported recently in our works. − In the medium of anthracene coal-tar fraction, the yields of pitch containing product at temperatures of 350–380 °C were up to 80%. The extraction of pitch-like products occurred very selectively; only a little distillates and gases were obtained.…”

Section: Introductionsupporting

confidence: 60%

Comparative Study of the Properties of the Coal Extractive and Commercial Pitches

2017

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Three extractive pitches were produced by using thermal dissolution of the medium-ranked coals at 380 °C in anthracene oil. The empirical properties such as the chemical composition, solubility in quinoline and toluene, softening point, and content of carcinogenic polycyclic hydrocarbons, and also molecular and structural parameters of the extractive pitches were characterized in comparison with three commercially available pitches, including typical coal-tar pitch, petroleum-derived pitch, and blended pitch derived from the mixture of coal tar with petroleum feedstock. The molecular and structural properties of pitches were studied using FTIR, 1H and 13C NMR, and XRD techniques. It was shown that the average molecule of the extractive pitches was composed of predominantly aromatic rarely substituted pericondensed nuclei, such as that in coal-tar pitch. The spatial structures of both the extractive and reference pitches consisted of predominantly disordered carbon matter with a small amount of rather ordered nanosized “graphite-like” stacks. In terms of the technical specifications, the extractive pitches irrespective of the coal used met the requirements for the pitch binder and resembled commercial blended petro-coal-tar pitch. A remarkable merit of the extractive pitches compared to coal-tar pitch was low carcinogenicity (two to three times as low).

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Section: Introductionsupporting

confidence: 60%

Comparative Study of the Properties of the Coal Extractive and Commercial Pitches

2017

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“…During thermal dissolution in the anthracene fraction of coal tar, the yield of pitch-bearing products is high for GZh and Zh coal, as we showed in [26][27][28]. The technical and structural properties of the pitch produced resemble those of hybrid pitches based on mixtures of coal tar and petroleum [29,30].…”

Section: Introductionmentioning

confidence: 60%

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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“…Traditionally, this process is focused on achieving the complete destruction of the organic mass of coal while obtaining light hydrocarbon fractions for fuel purposes [28,29].…”

Section: Introductionmentioning

confidence: 99%

Non-Catalytic Dissolution of Biochar Obtained by Hydrothermal Carbonization of Sawdust in Hydrogen Donor Solvent

et al. 2021

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The production of fuel hydrocarbons from CO2-neutral raw materials is a promising task at present. The thermal dissolution of biochar obtained by the method of hydrothermal carbonization of sawdust was studied. The dissolution of biochar in tetralin (hydrogen donor solvent) was studied at different temperatures (350–450 °C) and with two types of dilution of the mixture with tetralin: 1/3 and 1/4. The process proceeded without a catalyst. It was found that the samples subjected to thermal dissolution at temperatures of 425–450 °C had the highest conversion and yield of liquid products. The reaction temperature also had a significant effect on the composition of liquid products. It was found that an increase in the reaction temperature led to a significant increase in benzenes, both in the direct and in the hexane fraction. A benzene yield of more than 50% was observed for both fractions at a temperature of 450 °C. It was also suggested that the possible positive effect of abietates on the homogenization of the reaction mixture contributed to high conversion in the process. The biochar/tetralin ratio effects the yield and composition of the liquid products as well. An increase in the tetralin concentration in the mixture during thermal dissolution led to an increase in the conversion and yield of hydrocarbon fractions for fuel purposes. This is undoubtedly due to the large amount of elemental hydrogen involved in the hydrogenation of the reaction mixture.

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Getting an Alternative Pitch Binder by Thermal Dissolution of Coal

Cited by 9 publications

References 18 publications

Comparative Study of the Properties of the Coal Extractive and Commercial Pitches

Comparative Study of the Properties of the Coal Extractive and Commercial Pitches

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

Non-Catalytic Dissolution of Biochar Obtained by Hydrothermal Carbonization of Sawdust in Hydrogen Donor Solvent

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