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Modeling the Process of Purifying Ethylene from Acetylene Hydrocarbons over Palladium Nanocatalysts

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Abstract

An analysis of the process of selective hydrogenation of acetylene in the ethane–ethylene fraction of pyrolysis gas over a palladium-containing catalyst of the KPNM-45M brand promoted by the elements from Groups I, II, and VI of the Periodic Table is performed. Spherical granules of α-Al2O3 with a diameter of 0.4 cm are used as the support. The concentration of palladium on the support is less than 0.05 wt %. The activation of a KPNM-45M catalyst and kinetic experiments are performed in a plug flow laboratory-scale reactor with a diameter of 2 cm with a length of the catalytic zone of 35 cm. When performing the experiments, the space velocity of the feedstock is varied from 2000 to 4000 h−1, the pressure is varied from 20 to 30 atm, the temperature of the reaction medium is varied from 333 to 393 K, and the hydrogen/acetylene molar ratio is varied from 1.5 to 3. A stage mechanism of the hydrogenation reactions of acetylene and ethylene is proposed and a kinetic model corresponding to it is constructed. Overall, 80 kinetic experiments are carried out. The kinetic model parameters are estimated based on the results of the experiment by the least squares method. The region of selective hydrogenation of acetylene in the acetylene–ethylene–ethane mixtures is determined in which a gain in ethylene in the output stream of the reagents is observed during the hydrogenation reaction of acetylene. The results of the laboratory-scale kinetic experiment are confirmed on bench-scale and prototype industrial reactors.

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Authors and Affiliations

  1. Mendeleev University of Chemical Technology of Russia, 125047, Moscow, Russia

    E. V. Pisarenko & A. A. Ilinova

  2. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Moscow, Russia

    A. B. Ponomaryov

  3. OOO Synton, 108841, Moscow, Russia

    V. N. Pisarenko

Authors
  1. E. V. Pisarenko
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  2. A. B. Ponomaryov
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  3. A. A. Ilinova
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  4. V. N. Pisarenko
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Correspondence to E. V. Pisarenko.

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Translated by E. Boltukhina

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Pisarenko, E.V., Ponomaryov, A.B., Ilinova, A.A. et al. Modeling the Process of Purifying Ethylene from Acetylene Hydrocarbons over Palladium Nanocatalysts. Theor Found Chem Eng 54, 446–455 (2020). https://doi.org/10.1134/S0040579520030100

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  • DOI: https://doi.org/10.1134/S0040579520030100

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