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Properties of pitch-like materials obtained using coal extraction

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Abstract

The bituminous coal was extracted with different industrial solvents like coal tar (CT), heavy cycle oil (HCO) and with their blends to determine the influence of solvent type on the extract yield, composition, thermal behavior, properties such as solubility to toluene and quinoline. The extracts obtained at 380 °C represented pitch-like solid matter with the softening points of 72–127 °C depending on the solvent used. They were characterized using the elemental and group analysis, FTIR spectroscopy, TG-DTG thermogravimetry and liquid chromatography for benzo(a)pyrene concentration. Also, maltene fractions of some extracts were studied by GC–MS. The results showed coal dissolution and the properties of the extracts to differ greatly depending on the solvent used. Coal tar was more favorable solvent for coal dissolution than HCO. Good correlation between the extract aromaticity and the content of the toluene insolubles was observed. The maltene fractions of the extracts obtained with CT and CT blended with HCO consisted mainly of polycyclic aromatics, and that obtained with the HCO contained also large amount of aliphatic compounds. It was found that the amount of the carcinogenic benzo(a)pyrene (BaP) in the toluene soluble fractions of the extracts were different depending on the solvents used for extraction. The remarkable result was that the BaP concentrations in all extracts were much lower than in the solvents used.

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Acknowledgements

This work was carried out within the framework of the state assignment of the Institute of Chemistry and Chemical Technology of the SB RAS (project AAAA-A17-117021310220-0) with financial support from the Russian Foundation for Basic Research (grant no. 19-53-44001) and in Institute of Chemistry and Chemical Technology of the Mongolian Academy of Sciences with financial support from the Mongolian Foundation for Science and Technology (Grant No.-SHUGH/OHU/-2019/13).

Analytical data were obtained using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center of the KSC SB RAS and of the Institute of Chemistry and Chemical Technology of the Mongolian Academy of Sciences.

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Authors and Affiliations

  1. Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia

    B. Avid, M. Battsetseg, B. Purevsuren & G. Shiirav

  2. Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center “Krasnoyarsk Science Center SBRAS”, 50-24 Akademgorodok, Krasnoyarsk, 660036, Russia

    P. N. Kuznetsov, L. I. Kuznetsova & E. S. Kamenskii

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  1. B. Avid
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  2. M. Battsetseg
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  3. B. Purevsuren
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  4. G. Shiirav
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  5. P. N. Kuznetsov
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  6. L. I. Kuznetsova
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  7. E. S. Kamenskii
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Correspondence to B. Avid.

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Avid, B., Battsetseg, M., Purevsuren, B. et al. Properties of pitch-like materials obtained using coal extraction. Carbon Lett. 32, 605–614 (2022). https://doi.org/10.1007/s42823-021-00297-4

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