Corresponding-states correlations for estimating partial molar volumes of nonelectrolytes at infinite dilution in water over extended temperature and pressure ranges

Analysis has been made of a large volume of data to obtain the partial molar volumes of aqueous solutes at infinite dilution for temperatures up to 700 K and pressures up to 50 MPa. Values of V 2 ∞ are expressed in terms of the infinite dilution water–solute direct correlation function integral (DCFI) at the conditions of interest reduced by the solute's DCFI at 298.15 K, 0.1 MPa. Empirical equations have been found for the temperature-density dependence of these reduced DCFIs for solute classes of: simple fluids, nonpolar compounds, aromatic compounds, monohydric alcohols, monocarboxylic acids, nitriles, amides, and other organic solutes. A reliable, but less accurate generalization, based on pure water DCFI, has also been developed for the reduced DCFI for solute classes of: simple fluids, nonpolar compounds, polar substances, and compounds containing chemically bonded water. At high densities, the reduced DCFI for all solutes is the same as that for water, which is consistent with the behavior of hard-sphere mixtures.