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Isothermal vapour-liquid equilibria in cyclohexanone + dichloroalkane binary mixtures at temperatures from 298.15 to 318.15K

Dragoescu Dana ("Ilie Murgulescu" Institute of Physical Chemistry, Splaiul Independentei, Bucharest, Romania)
Barhala Alexandru ("Ilie Murgulescu" Institute of Physical Chemistry, Splaiul Independentei, Bucharest, Romania)
Teodorescu Mariana ("Ilie Murgulescu" Institute of Physical Chemistry, Splaiul Independentei, Bucharest, Romania)
Chiscan Daniela ("Ilie Murgulescu" Institute of Physical Chemistry, Splaiul Independentei, Bucharest, Romania)

The vapour pressures of binary mixtures of cyclohexanone + dichloroalkane (1,3-dichloropropane and 1,4-dichlorobutane) were measured at temperatures between 298.15 K and 318.15 K. The vapour pressures vs. liquid phase composition data were used to calculate the activity coefficients of the two components and the excess molar Gibbs energies GE for the mixtures, using the Barker method and the Redlich-Kister, Wilson, NRTL and UNIQUAC equations, taking into account the vapour phase imperfection in terms of the 2nd virial coefficient. No significant difference between the GE values obtained with these equations was observed.

Keywords: vapour pressure, vapour-liquid equilibria, excess Gibbsenergy, mixtures, cyclohexanone, dichloroalkanes