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Conversion of Pyrrole in Supercritical Water and Water–Oxygen Fluid

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Abstract

The conversion of pyrrole in supercritical water and water–oxygen fluid in continuous flow (673–823 K, 25 MPa, excess of oxygen ≤2.46, residence time 18–148 s) is studied. It is found that, in the absence of O2, an increase in temperature leads to an increase in the pyrrole conversion and the yield of gaseous products (H2, CH4, CO, and CO2). When pyrrole is oxidized in a water–oxygen fluid, the excess oxygen has a greater effect on the degree of removal of organic carbon than temperature. The products obtained at 723 and 773 K contain a solid substance, the IR spectrum of which corresponds to polypyrrole. In general, the oxidation of pyrrole in a water–oxygen fluid occurs by the mechanism of parallel and consecutive reactions, including the formation and oxidation of ring-opening products, as well as the formation and oxidation of pyrrole polymerization products.

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ACKNOWLEDGMENTS

We thank M.Ya. Sokol and V.E. Tolstokorov for their help in performing the experiments and D.O. Artamonov for processing the mass spectra of the volatile products (all from the Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia).

Funding

This study was supported by the Russian Foundation for Basic Research (project no. 18-29-06005).

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    O. N. Fedyaeva & A. A. Vostrikov

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  1. O. N. Fedyaeva
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  2. A. A. Vostrikov
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Correspondence to O. N. Fedyaeva.

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Translated by V. Glyanchenko

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Fedyaeva, O.N., Vostrikov, A.A. Conversion of Pyrrole in Supercritical Water and Water–Oxygen Fluid. Russ. J. Phys. Chem. B 16, 1409–1415 (2022). https://doi.org/10.1134/S1990793122080140

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