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Non-condensing gases produced in the vacuum distillation of residual fuel

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As a result of study of eight industrial distillation plants the ranges of output and composition of uncondensed gases in the vacuum parts were determined

  1. 1.

    The hydrocarbon part of the uncondensed gas is in the range 0.005–0.42%. On average this gas includes 70% paraffin (from C1 to C6, and above), 5–15% naphthenes, 15–20% olefins. The mean molecular weight of the hydrocarbon gas is 36–68.

  2. 2.

    The quantity of inert gas that the ejector removes from the column ranges from 0.001 to 0.14% of the fuel oil. This gas contains 70–90% air, the greater part of which enters through leaks in the system.

  3. 3.

    When operating on high sulfur crude more decomposition products are formed than on low sulfur crude.

  4. 4.

    When the furnace has panel heaters the gas output is 0.005–0.006% which is a tenth to a twentieth of that in installations with other types of furnace, even with lower preheating temperatures. Alternating the flow diagram of feed in a sloping-roof furnace by transferring the evaporation zone to the less severely thermally loaded floor screens, also reduces decomposition gas output to 0.04–0.07% against 0.24–0.42% in a furnace with a normal feed flow circuit.

  5. 5.

    On increasing the heating temperature of fuel oil in the furnace by 10–15°C in individual cases the gas output is raised by a factor of 1.5 to 2.0

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Literature cited

  1. 1.

    W. L. Nelson, Petroleum Refinery Engineering, McGraw Hill Book Co. Inc., New York(1958).

  2. 2.

    M. A. Bestuzhev, Azerb. neft. khoz. No. 10 (1928).

  3. 3.

    O. E. Benedict, Petroleum Ref.31, No. 1 (1952).

  4. 4.

    G. G. Rabinovich, Design of Petroleum Distillation Apparatus [in Russian] Gostoptekhizdat (1941).

  5. 5.

    W. L. Nelson, Oil and Gas J, V.14, No. 19 (1956).

  6. 6.

    W. L. Nelson, Oil and Gas J, V.56, No. 31 (1958).

  7. 7.

    I. L. Gurevich, Petroleum Technology, Fart 1 [in Russian], Gostoptekhizdat (1952).

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Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel No. 3, pp. 7–10, 1969.

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Manovyan, A.K., Odintsov, O.K., Skoblo, A.I. et al. Non-condensing gases produced in the vacuum distillation of residual fuel. Chem Technol Fuels Oils 5, 172–175 (1969).

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  • Furnace
  • Naphthene
  • Vacuum Distillation
  • Flow Circuit
  • Vacuum Part