1999, Volume 2, Issue 3+4
Vapour - Liquid Equilibriium in Multicomponent Mixtures of Hydrogen's Isotopes
Institute of Cryogenics & Isotope Separations, Rm. Valcea
An important issue in the separation of hydrogen's isotopes using cryogenic distillation is the precise knowledge of the vapour-liquid equilibrium. To computes the equilibrium, we considered the non-idealities both in the vapour and in the liquid phase. We computed the specific volumes of hydrogen's isotopes with the aid of the virial equation of state and the Redlich-Kwong equation of state. The enthalpy of evaporation was computed with the aid of the Clausius-Clapeyron equation, where the saturation pressure for hydrogen's isotopes was expressed with the Mittelhauser equation. For the activity coefficients on the liquid phase, we hawe performed a comparative study of Hildebrand and Margules theories applied to mixtures of hydrogen's isotopes. The model is in good agreement with experimental data obtained for mixtures H2-D2 and H2-HD. Relevant data obtained on ternary mixtures are also presented (as Gibbs diagrams).
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