Vapor-liquid equilibrium data for the binary systems of methanol-methyl ethyl ketone, ethanol-methyl ethyl ketone, methyl ethyl ketone-n-propanol and methyl ethyl ketone-n-butanol were investigated.
In these systems, vapor-liquid equilibrium data for methyl ethyl ketone-n-propanol and methyl ethyl ketone-n-butanol system were measured under atmospheric pressure.
In order to confirm the accuracy of experimental results, the x-y data obtained are thermodynamically analyzed with the Herington's consistency test, and checked with the relations of activity coefficients and Q-functions to the liquid phase compositions.
It was shown that the logarithmic value of relative volatility （log α） exhibited a linear function of the liquid composition (x) for systems.
And these linear relationships for each of four systems indicate a strong tendency falling into a single point, when each line is extended.
The present study proposed the empirical equations by which x-y data for each binary system of methyl ethyl ketone-alcohols can be estimated.
And the x-y data estimated by the proposed equations are compared with the experimental data, and proved to be in a good coincidence with them.