Determination of the Krichevskii function in near-critical dilute solutions of I₂(s) and CHI₃(s)

Author： Japas M.L. Alvarez J.L. Gutkowski K. Fernández-Prini R.

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.30, Iss.12, 1998-12, pp. : 1603-1615

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Abstract

In the present work the solubility of CHI₃(s) in xenon has been spectrophotometrically measured at different sub- and supercritical temperatures, and along the isotherm of T=316.9 K at pressures between 5 MPa and 10 MPa. Using these results together with already available solubilities for I₂(s) and CHI₃(s) in near-critical solvents, we have calculated the Krichevskii function (∂p/∂x)^∞_{V, T} for a series of dilute near-critical binary solutions; this quantity accounts for solute–solvent interactions in the binary mixtures. The Krichevskii functions are found to be only weakly dependent on the temperature. The fluid density dependence of (∂p/∂x)^∞_{V, T} is discussed in terms of intermolecular interactions; the fluorinated solvents show very low interaction with the solutes. Krichevskii functions can be used to predict various thermodynamic properties of the solution.