ABSTRACT
Liquid-gas equilibrium plays an important role in a wide range of natural and industrial processes. Most gas mixtures can be separated by contact with a suitable liquid, if it is chosen to preferentially dissolve one component. Hildebrandand others have pointed out that a close relationship exists between the logarithm of the gas solubility and the Hildebrand parameter of the liquid. The Hildebrand-Scatchard equation had already been applied in a slightly different way to solutions of argon, nitrogen, hydrogen, and other gases. Hildebrand also provided graphical correlations of gas solubilities with liquid Hildebrand parameters which are widely used. The slopes are similar for many of the simpler gas solutes. The solvent properties of compressed gases, especially carbon dioxide, for biochemicals and polymers have been receiving more attention because of their application in high pressure gas chromatography and supercritical fluid chromatography. It should be noted that Henry’s law assumes that the gas-phase fugacity is equal to the partial pressure.
