Abstract
Ternary vapor-liquid equilibrium can be predicted by use of the extended UNIQUAC and LEMF equations whose energy parameters are obtained from the correlation of the corresponding liquid-liquid equilibrium data. Three objective functions are used in parameter estimation, and objective functions are usually preferred defined in terms of liquid-phase mole fractions than in terms of activities. The extended UNIQUAC equation shows better performance than the LEMF equation. Prediction of binary vapor-liquid equilibrium from ternary liquid-liquid equilibrium data confirms the same trends as observed in ternary vapor-liquid equilibrium predictions.
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