THERMODYNAMICS OF BINARY-MIXTURES CONTAINING LINEAR OR CYCLIC ALKENESPLUS N-ALKANES OR CYCLOHEXANE

A head-space technique has been used to determine vapor-phase equilibr ia for binary mixtures of linear or cyclic mono- and polyalkenes + n-a lkanes or + cyclohexane. Excess molar Gibbs energies, G(E), for the mi xtures investigated were obtained by a least-squares treatment of the equilibrium results. These data, the previously measured excess enthal pies, H-E, and the data available in the literature on G(E), H-E, acti vity coefficients at infinite dilution, gamma(i)(infinity), and molar excess enthalpies at infinite dilution, h(i) (E,infinity) are examined on the basis of the DISQUAC group contribution model. The model provi des a fairly consistent description of the phase equilibria and the re lated excess functions, using a unique set of structure-dependent disp ersive parameters.