International Journal of Thermophysics

, Volume 13, Issue 5, pp 801–815 | Cite as

Viscosity of biniary mixtures. III. Tri-n-butylamine with alkanes and monoalkylamines at 303.15 and 313.15 K

  • S. L. Oswal
  • S. G. Patel


Viscosities η of seven binary systems of n-propylamine, n-butylamine, n-hexylamine, n-octylamine, n-hexane, n-octane, and isoctane (2,2,4-trimethylpentane) with tributylamine have been measured at 303.15 and 313.15 K with an Ubbelohde suspended-level viscometer. Based on Eyring's theory, values of excess Gibbs energy of activation δG *E of viscous flow have been calculated. Deviations of viscosities from linear dependence on the mole fraction and values of δG *E are attributed to the H-bonding and to the size of alkylamine and alkane molecules. The free volume theory of Prigogine-Flory-Patterson in combination with work by Bloomfield-Dewan has been used to estimate the excess viscosity δ ln η and the terms corresponding to enthalpy, entropy, and free volume contributions for the present binary mixtures.

Key words

activation energy alkylamines alkanes binary liquids propylamine butylamine hexylamine octylamine n-hexane n-octane isooctane (2,2,4 trimethyl pentane) tributylamine Eyring's theory Prigogine-Flory-Patterson-Bloomfield-Dewan theory viscosity 


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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • S. L. Oswal
    • 1
  • S. G. Patel
    • 1
  1. 1.Department of ChemistrySouth Gujarat UniversitySuratIndia

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