Thermal Conductivity Measurements and Molecular Association: Ethanol Vapor

  • D. J. Frurip
  • L. A. Curtiss
  • M. Blander


Thermal conductivity measurements on ethanol vapor are reported as a function of temperature (329–419K) and pressure (100–1800 torr). The thermal conductivity versus pressure plots at constant temperature exhibit strong upward curvature at the lower temperatures and nearly linear increases at the higher temperatures. This enhancement in the thermal conductivity is indicative of the presence of a dimeric species and one or more larger clusters in the vapor. Analysis of the data gave best fits for monomer-dimer-tetramer and monomer-dimer-hexamer models. The resulting thermodynamic parameters for the association reactions in the monomer-dimer-tetramer model are: -ΔH2 = 3.70 kcal mol−1, -ΔS2 = 16.36 cal mol−1 K−1; -ΔH4 = 22.15 kcal mol−1, -ΔS4−74.65 cal mo1−1 K−1. Quantum mechanical evidence indicates that the tetramer is the most probable associated species larger than the dimer.


Thermal Conductivity Ethanol Vapor Molecular Association Thermal Conductivity Enhancement Associate Species 
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Copyright information

© Purdue Research Foundation 1983

Authors and Affiliations

  • D. J. Frurip
    • 1
  • L. A. Curtiss
    • 1
  • M. Blander
    • 1
  1. 1.Chemical Engineering DivisionArgonne National LaboratoryArgonneUSA

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