Abstract
The determination of activity coefficients for various two-component liquid—vapour systems was accomplished by reversed-flow gas chromatography. By means of derived mathematical equations, the gaseous equilibrium concentration of each component under study, in the pure state and in the binary mixture, was determined. From these equilibrium concentrations, activity coefficients for the alcohol component in the binary mixtures methanol—water, ethanol—water and 1-propanol—water were calculated. The coefficients found depend on the nature of the alcohol component, its molar fraction and temperature. From the activity coefficients measured and their variation with temperature, excess partial molar thermodynamic functions of mixing were calculated. The activity coefficients found are compared with those at infinite dilution, calculated by an empirical equation.
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