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An isoplethic phase envelope is a locus of two-phase equilibria where one of the phases is kept at constant composition. The thermodynamic conditions for such a phase envelope are expressed as a set of first-order ordinary differential equations in which molar concentrations appear as central variables instead of mole fractions. The resulting formalism is applicable to multicomponent mixtures, well-suited...
The thermodynamic conditions for isothermal or isobaric two-phase boundaries of fluid mixtures are expressed as sets of first-order ordinary differential equations. In contrast to the Gibbs–Konovalov equations, the new equations use molar densities instead of mole fractions. The resulting formalism is applicable to multicomponent mixtures, well-suited for machine calculations, and allows a very rapid...
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