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Conversion of brown coal in sub- and supercritical water at cyclic pressurization and depressurization

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Abstract

The conversion of brown coal in sub- and supercritical water at 310–460°C and pressures up to 30 MPa in the cyclic pressurization and depressurization modes is studied. The temperature dependences of coal organic matter (COM) conversion and the yield of volatile and condensed products are obtained. The temperature dependence of the yield of condensed substances has a maximum at 370°C. The fraction of high-molecular substances in condensed products is increased with increasing temperature. The cumulative conversion of COM into volatile and condensed products upon heating to 460°C was 31.4 and 8.6%, respectively. According to the data of mass spectrometry analysis of volatile products and the elemental analysis of the initial coal, carbonaceous residue after the conversion, and condensed products, 82.3% of oxygen and 74.7% of sulfur, are removed from COM. CO2 and H2S are the main products of the conversion of oxygen- and sulfur-containing groups.

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    O. N. Fedyaeva, A. A. Vostrikov, A. V. Shishkin & M. Ya. Sokol

  2. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    L. S. Borisova & V. A. Kashirtsev

Authors
  1. O. N. Fedyaeva
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  2. A. A. Vostrikov
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  3. A. V. Shishkin
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  4. M. Ya. Sokol
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  5. L. S. Borisova
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  6. V. A. Kashirtsev
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Correspondence to O. N. Fedyaeva.

Additional information

Original Russian Text © O.N. Fedyaeva, A.A. Vostrikov, A.V. Shishkin, M.Ya. Sokol, L.S. Borisova, V.A. Kashirtsev, 2011, published in Sverkhkriticheskie Flyuidy: Teoriya i Praktika, 2011, Vol. 6, No. 4, pp. 59–75.

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Fedyaeva, O.N., Vostrikov, A.A., Shishkin, A.V. et al. Conversion of brown coal in sub- and supercritical water at cyclic pressurization and depressurization. Russ. J. Phys. Chem. B 6, 793–803 (2012). https://doi.org/10.1134/S1990793111080069

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  • DOI: https://doi.org/10.1134/S1990793111080069

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