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Effect of the hydrogen pressure on the kinetics of the liquid-phase catalytic hydrogenation of aromatic nitro compounds

  • I. A. Makaryan
  • V. I. Savchenko
  • Kh. A. Brikenshtein
Physical Chemistry
  • 37 Downloads

Conclusions

  1. 1.

    The relation between the rate of liquid-phase nitro compound hydrogenation and the hydrogen pressure is complex. Over the pressure range from 0.1 to 0.9 MPa, the concentration of the initial nitro product varies in direct proportion to the hydrogen pressure, and this despite the fact that the rate of conversion of the intermediate phenylhydroxylamine into the amino product is unaffected by an alteration in the pressure. This supports the suggestion that the catalytic hydrogenation of nitro compounds proceeds through disproportionation, rather than reduction, of the phenylhydroxylamines.

     
  2. 2.

    The possibility of increasing the selectivity of the hydrogenation reaction for pchlorohydroxylamine formation is discussed, and it is shown that the yield of this product can be increased markedly by working at high pressure and low temperature.

     

Keywords

Hydrogenation High Pressure Pressure Range Disproportionation Hydrogen Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature cited

  1. 1.
    D. V. Sokol'skii and V. A. Druz', Theory of Heterogeneous Catalysis [in Russian], Nauka, Alma-Ata (1968), p. 151.Google Scholar
  2. 2.
    F. B. Bizhanov, Proceedings of the Institute of Organic Catalysis and Electrochemistry of the Academy of Sciences of the Kazakh SSR, Hydrogenation and Oxidation on Heterogeneous Catalysts [in Russian], Vol. 19, Alma-Ata (1978), p. 115.Google Scholar
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    P. N. Ovchinnikov, I. I. Bat', G. A. Chistyakova, and A. S. Muchnik, in: The Catalysis of Liquid-Phase Reduction of Aromatic Nitro Compounds [in Russian], Khimiya, Leningrad (1962), No. 62, p. 37.Google Scholar
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    V. I. Savchenko, T. V. Denisenko, S. Ya. Sklyar, and V. D. Sitonov, Zh. Org. Khim.,11, 2149 (1975); ibid.,12, 1036 (1976).Google Scholar
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    V. D. Sitonov, T. V. Denisenko, V. I. Savchenko, S. Ya. Sklyar, and N. M. Ryazanova, Khim. Promyshlennost', No. 8, 19 (1977).Google Scholar
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    V. P. Shmonina, Proceedings of the Institute of Chemical Science of the Academy of Sciences of the Kazakh SSR. Liquid-Phase Hydrogenation Catalysts [in Russian], Vol. 14, Alma-Ata (1966), p. 78.Google Scholar

Copyright information

© Plenum Publishing Corporation 1981

Authors and Affiliations

  • I. A. Makaryan
    • 1
  • V. I. Savchenko
    • 1
  • Kh. A. Brikenshtein
    • 1
  1. 1.Branch of the Institute of Chemical PhysicsAcademy of Sciences of the USSRChernogolovka

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