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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
Article

Abstract

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 

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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

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