Parameters of the UNIQUAC model for describing the vapor-liquid phase equilibrium of D<sub>2</sub>-T<sub>2</sub>, D<sub>2</sub>-DT, DT-T<sub>2</sub> hydrogen isotope mixtures

Objectives. Determination of the parameters binary energy interaction (UNIversal QUAsiChemical) UNIQUAC model on basis mathematical processing experimental literature data phase equilibrium hydrogen isotopic mixtures D 2 -T2, -DT, DT-T to calculate activity coefficients components , DT, and T . Methods The method successive approximations was used in junction with “from stage stage” method, which consists calculating a single evaporation process theoretical plate. Results. Equations were written for isotopes Sherwood theory as applied -T ternary -DT-T isotope mixtures. graphical dependences separation are compared range concentration highly volatile component from 0 100 mol % at atmospheric pressure three options: ideal mixtures; non-ideal using theory; model. found be similar all However, when considering ideal, increases. According Sherwood's theory, remains practically constant value, is independent composition mixture. predicts decrease an increase less profile distribution three-component mixture along height distillation column operating closed mode calculated variants. It accepted that: equal 760 mm Hg. Art.; number plates 21; liquid first plate (stage), %: X D₂ = 65; DT 10; T₂ 25; accuracy vapor 10-10. Conclusions. determined. adequate relation coefficient separation. Due systematic deviations models, they not suitable further calculations