Crossover equation of state and microstructural properties of infinitely dilute solutions near the critical point of a pure solvent

Microstructural (correlation integrals, cluster size) and related thermodyn amic (partial molar volume, Krichevskii parameter) properties of infinitely dilute solutions near the critical point of a pure solvent are studied in terms of nonclassical (crossover) equations of state. The Krichevskii param eter eras evaluated for a number of binary solutions by analyzing the initi al slopes of the critical lines and the properties of a pure solvent. Quali tative explanation is offered for the physicochemical mechanism of the anom alously high solubility of slightly volatile substances in a supercritical solvent based on microstructural and thermodynamic characteristics of a sup ercritical of fluid mixture.