BIBLIOS

Document type
Journal articles

Document subtype
Full paper

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

Participants in the publication
C. M. Padrel de Oliveira (Author)
UNIVERSIDADE ABERTA
J. M. N. A. Fareleira (Author)
INSTITUTO SUPERIOR TÉCNICO
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Summary
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 stereochemical 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.


Institution
INSTITUTO SUPERIOR TÉCNICO

Where published
International Journal of Thermophysics

Publication Identifiers

Publisher
Springer Science and Business Media LLC



Document Identifiers
DOI - https://doi.org/10.1007/bf00503166
URL - http://dx.doi.org/10.1007/bf00503166

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

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