Consider a binary mixture composed of chloroform and acetone. This mixture exhibits a negative azeotrope. This Demonstration computes and plots the isobaric vapor-liquid equilibrium (VLE) diagram, the equilibrium curve, the relative volatility, the ... -value, and the gas phase fugacity coefficients for user-specified values of the pressure. This Demonstration takes into account the deviation from ideal behavior in the gas phase by including gas phase fugacity coefficients. Thus high-pressure VLE data can be obtained. This Demonstration does not allow for the Poynting Factor Correction (or POY). VLE data is computed using the following formula (the gamma-phi equation): ... where ... and ... are the vapor and liquid mole fractions of component ... , ... is the total pressure, ... is the saturation vapor pressure of component ... , ... and ... are the vapor-phase fugacity coefficient and the liquid-phase activity coefficient determined using the Soave–Redlich–Kwong equation of state and the Wilson model, respectively.


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