Abstract
In the measurement of infinite-dilution activity coefficients for a multicomponent system by the gas stripping method, this paper shows a way to obtain more limiting data to improve the study of multicomponent phase equilibria. As an example, the infinite-dilution ternary activity coefficients γ∞A(B,C) for the acetonitrile−benzene−n-heptane system were determined at 318.15 K. Inasmuch as the solvents involved are often composed of two components, the double-cell technique (DCT) was employed to obtain steady solvent surroundings for the dilute solutes, which are apparently an essential condition for reasonable and meaningful measurements of infinite-dilution activity coefficients. The experimental γ∞A(B,C) values were correlated by use of the NRTL and UNIQUAC equations, and the vapor−liquid and liquid−liquid equilibria for the relevant system could be predicted.
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