Properties of Binary Mixtures as a Function of Composition.

Abstract

D a t a on physical properties of mixtures as a function of composition and temperature are valuable in correlating other properties and in analytical studies. In this and subsequent investigations an attempt w a s made to develop experimental data for a number of systems on which generalized correlations could be developed relating Composition and the property evaluated based on the properties of the pure components, Thus, eight binary systems having a rather wide range of properties (particularly interfacial tension) and in most cases, representing nonideal liquid mixtures were studied. The systems were: 1-propanol-water; toluene-n-octane; water-1-butanol; acetone-1-butanol; benzene-2-chloroethanol; carbon tetrachloride-1-propanol; ethyl alcohol-1,4-dioxane; and methanol-l,4-dioxane. The properties determined were: refractive index vs. composition, liquid density vs. composition and temperature, interfacial tension a t the boiling point and a t 3OoC. as a function of composition, liquid viscosity as a function of temperature and composition, and vapor viscosity a s a function of temperature and composition. Because of the peculiar variation of interfacial tension and viscosity with composition a t the boiling point, no general correlations have been developed. More data on both binary and ternary systems are necessary.