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Abstract: The alternative approach to the displacement of gas-liquid equilibrium isdeveloped on the basis of the Clapeyron equation. The phase transition in thesystem with well-established properties is taken as a reference process tosearch for the parameters of phase transition in the perturbed equilibriumsystem. The main equation, derived in the framework of both classicalthermodynamics and statistical mechanics, establishes a correlation betweenvariations of enthalpies of evaporation, \Delta \Delta H, which is induced byperturbations, and the equilibrium vapor pressures. The dissolution of asolute, changing the surface shape, and the effect of the external field ofadsorbents are considered as the perturbing actions on the liquid phase. Themodel provides the unified method for studying 1 solutions, 2 membraneseparations 3 surface phenomena, and 4 effect of the adsorption field; itleads to the useful relations between \Delta \Delta H, on the one hand, andthe osmotic pressures, the Donnan potential, the surface curvature, and thepore structure, on the other hand. The value of \Delta\Delta H has a clearphysical meaning and gives a new insight into our understanding of theapparently different phenomena. The model is applicable if the change betweenentropies of the comparable gas phases is far more than the difference betweenentropies of the liquid phases.

Autor: Vladimir Kh. Dobruskin



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