Letter | Published:

Prediction of Critical Temperatures

Naturevolume 180page1353 (1957) | Download Citation



IN cases where critical temperatures are unknown they can be calculated from a number of empirical or semi-empirical formulæ1, the simplest but least-accurate being Guldberg's rule. More accurate equations exist for estimating values for hydrocarbons, for example, those of Jatkar and Lakshminarayanan2 and Watson3, but these are unsuitable for use with phenolic and basic organic compounds which occur in coal tar.

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  1. 1

    Partington, J. R., “An Advanced Treatise on Physical Chemistry”, 646 et seq. (Longmans, Green and Co., London, 1949).

  2. 2

    Jatkar, S. K. K., and Lakshminarayanan, D., J. India Inst. Sci., 28, A, 1 (1946).

  3. 3

    Watson, K. M., Indust. Eng. Chem., 23, 360 (1931).

  4. 4

    “Selected Values of Physical and Thermodynamic Properties of Hydrocarbons and Related Compounds”, A.P.I. Research Project 44 (1953).

  5. 5

    Doss, M. P., “Physical Constants of the Principal Hydrocarbons” (The Texas Co., New York, 1943).

  6. 6

    Ambrose, D., and Grant, D. G., Trans. Farad. Soc., 53, 771 (1957).

  7. 7

    Coal Tar Research Association, “The Coal Tar Data Book” (Gomersal, C.T.R.A.).

  8. 8

    Egloff, G., “Physical Constants of Hydrocarbons” (Reinhold Pub. Corp., New York, 1946).

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  1. Research Laboratories, Coal Tar Research Association, Oxford Road, Gomersal, Leeds

    • D. K. H. BRIGGS
    •  & W. D. DRAKE


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