Vapor-liquid equilibrium was investigated at 29.3O C in the system 2,6-lutidinewater. Thermodynamic excess functions g", h", and Ts" for this system are given.

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Azeotropic Composition from the Activity Coefficients of Components An equation for calculating the composition of a binary azeotrope, x2 = (1 + a)-1, has been tested on 45 systems exhibiting small, medium, and large deviations from regularity. When corrections for the real behavior of the vapor phase were taken into account for the case in which one component Is associated in the vapor phase, e.g., acetic acid, the results obtained for the azeotropic composition improved considerably. The effect of the differences in the vaporization entropies of the components on the azeotropic composition, as exemplified by the systems containing acetic acid and n-paraffins, was found to be small compared to that of the dimerization of the acid in the vapor phase.

It is a well-known fact that azeotropes occur in organic and inorganic systems, although most of the known azeotropes are formed by organic substances. The explanation of this is simple: the very large number of organic compounds boil without decomposition in the easily accessible ranges of temperature and pressure. At the end of last century W. Ostwald considered azeotropy as an extremely rare phenomenon. This opinion has survived in some circles until