International Journal of Thermophysics

, Volume 10, Issue 5, pp 973–982 | Cite as

Mutual diffusivity in binary mixtures of n-heptane with n-hexane isomers

  • C. M. Padrel de Oliveira
  • J. M. N. A. Fareleira
  • C. A. Nieto de Castro


This paper presents a study of the influence of branching in the binary diffusion coefficients of n-heptane + n-hexane isomers, in the liquid state. The measurements have been made with the Taylor dispersion technique, at several compositions, at 283 and 298 K, for the X + n-heptane mixtures, where X= n-hexane, 3-methylpentane, 2, 3-dimethylbutane, and 2, 2-dimethylbutane. The results show a very interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a maximum, for compositions about a molar fraction of n-heptane of 0.5, which increases with the increase in the degree of branching, suggesting the possibility of order-disorder effects caused by stereochemically favored packing in the liquid phase and energetically favored segment interaction in the liquid mixtures. An attempt to apply the van der Waals model to these data could not predict the experimental binary diffusion coefficients of these systems within the experimental accuracy.

Key words

binary diffusion 2,2-dimethylbutane 2,3-dimethylbutane n-heptane n-hexane liquid mixtures 3-methylpentane Taylor dispersion 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M. L. S. Matos Lopes and C. A. Nieto de Castro, High Temp. High Press. 17:599 (1985).Google Scholar
  2. 2.
    M. L. S. Matos Lopes and C. A. Nieto de Castro, Int. J. Thermophys. 7:699 (1986).Google Scholar
  3. 3.
    A. Alizadeh, C. A. Nieto de Castro, and W. A. Wakeham, Int. J. Thermophys. 1:243 (1980).Google Scholar
  4. 4.
    M. L. S. Matos Lopes, C. A. Nieto de Castro, and C. M. Padrel de Oliveira, Fluid Phase Equil. 36:195 (1987).Google Scholar
  5. 5.
    J. H. Dymond, Physica 75:100 (1974).Google Scholar
  6. 6.
    J. H. Dymond, Chem. Phys. 17:101 (1976).Google Scholar
  7. 7.
    K. J. Czworniak, H. C. Anderson, and R. Pecora, Chem. Phys. 11:451 (1975).Google Scholar
  8. 8.
    V. Sanchez, H. Oftadeh, C. Durou, and J. P. Hot, J. Chem. Eng. Data 22:123 (1977).Google Scholar
  9. 9.
    H. J. V. Tyrrell and K. R. Harris, Diffusion in Liquids (Butterworths, London, 1984).Google Scholar
  10. 10.
    A. Heintz and R. N. Lichtenthaler, Angew. Chem. Int. Ed. Engl. 21:184 (1982).Google Scholar
  11. 11.
    J. C. G. Galado, J. M. N. A. Fareleira, C. A. Nieto de Castro, and W. A. Wakeham, Int. J. Thermophys. 4:193 (1983).Google Scholar
  12. 12.
    E. Gruska and P. Schnipelsky, J. Phys. Chem. 80:1509 (1976).Google Scholar
  13. 13.
    E. Gruska and V. R. Maynard, J. Phys. Chem. 77:1437 (1973).Google Scholar
  14. 14.
    E. Gruska and P. Schnipelsky, J. Phys. Chem. 78:1428 (1974).Google Scholar
  15. 15.
    R. W. Elliot and H. Watts, Can. J. Chem. 50:31 (1972).Google Scholar
  16. 16.
    C. Muckenfuss and C. F. Curtiss, J. Chem. Phys. 29:1257 (1958).Google Scholar
  17. 17.
    W. A. Wakeham and D. H. Slater, J. Phys. B 7:197 (1974).Google Scholar
  18. 18.
    F. Bachl and H. D. Lüdemann, Z. Naturforsch. 41a:963 (1986).Google Scholar
  19. 19.
    F. Bachl and H. D. Lüdemann, Physica, 139, 140B:100 (1986).Google Scholar
  20. 20.
    P. Bothorel, C. Clement, and P. Maraval, C.R. Acad. Sci. 264:658 (1967).Google Scholar
  21. 21.
    V. T. Lam, P. Picker, D. Patterson, and P. Tancrede, J. Chem. Soc. Faraday Trans. II 70:1465 (1974).Google Scholar
  22. 22.
    M. D. Croucher and D. Patterson, J. Phys. Chem. 82:40 (1978).Google Scholar
  23. 24.
    H. Quinones and P. Bothorel, C.R. Acad. Sci. 277:133 (1973).Google Scholar
  24. 25.
    S. F. Y. Li and W. A. Wakeham, Personal communication.Google Scholar
  25. 26.
    L. D. Eicher and B. J. Zwolinski, J. Chem. Phys. 76:3295 (1972).Google Scholar
  26. 27.
    R. Reid, J. M. Prausnitz, and B. E. Poling, The Properties of Gases and Liquids, 4th ed. (McGraw-Hill, New York, 1987).Google Scholar
  27. 28.
    N. B. Vargaftik, Tables on the Thermophysical Properties of Liquids and Gases, 2nd ed. (John Wiley & Sons, New York, 1975).Google Scholar
  28. 29.
    B. J. Alder, W. E. Alley, and J. H. Dymond, J. Chem. Phys. 61:1415 (1974).Google Scholar

Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • C. M. Padrel de Oliveira
    • 1
  • J. M. N. A. Fareleira
    • 1
  • C. A. Nieto de Castro
    • 1
  1. 1.Centro de Quimica Estrutural, Complexo I, ISTLisboa CodexPortugal

Personalised recommendations