Molar Interactions of Some Aromatic Hydrocarbons in n-Heptane by Viscometric Measurements at 298.15K

  • Md Kamrul Hossain Department of Chemistry, University of Chittagong, Chittagong
  • M Abdur Rahaman Department of Chemistry, Mawlana Bhashani Science & Technology University, Tangail-1902, Bangladesh
  • Shamim Akhtar Department of Chemistry, University of Chittagong, Chittagong
Keywords: Viscosity; n-heptane; Aromatic hydrocarbon.

Abstract

The viscosities, η , of pure n-heptane, toluene, o-xylene, mesitylene, and some of their binary mixtures covering the whole composition range have been measured at 298.15K. Deviations in viscosity, ∆η , was calculated using experimental results. The concentration dependencies of η were correlated to polynomial expressions, whereas, ∆η were fitted to the Redlich–Kister equation. Moreover, the values of the excess Gibbs free energy of activation, ∆G#E, of these mixtures were determined. Viscosity measurements of the binary systems were correlated with Grunberg and Nissan the three-body and four-body McAllister expressions. In all systems, ∆η were found to be negative in the whole range of composition with a single lobe having minimum at 0.6 mple fraction of aromatic hydrocarbon. While dispersive forces are suggested to dominate in n-heptane + toluene, for the other two systems  ‘favourable geometric fitting’ overpowers them due to the increasing number of  – CH3 groups in the relevant aromatic hydrocarbons.

The Chittagong Univ. J. Sci. 40 : 97-110, 2018

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Abstract
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Published
2018-06-28
How to Cite
Hossain, M. K., Rahaman, M. A., & Akhtar, S. (2018). Molar Interactions of Some Aromatic Hydrocarbons in n-Heptane by Viscometric Measurements at 298.15K. The Chittagong University Journal of Science, 40(1), 97-110. https://doi.org/10.3329/cujs.v40i1.47918
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