Abstract
Alvarez J. and Fernández-Prini R., 1991. A semiempirical procedure to describe the thermodynamics of dissolution of non-polar gases in water. Fluid Phase Equilibria, 66: 309–326. Measurements of the solubility of nitrogen in water at 582 and 612 K up to 54 MPa of gas pressure are reported. These measurements enabled us to test a method of determining the solute activity coefficient by means of a semiempirical perturbation method. The procedure is validated with a recently derived thermodynamic relationship that should be obeyed by dilute solutions close to the critical point of the pure solvent. As a consequence, a simplified procedure of measurement complemented by the semiempirical perturbation method of calculation is proposed and tested for the case of the ethylene-water system. The results are good and the method enables the description of the thermodynamics of dissolution over wide ranges of the state variables.
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