Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering and Chemistry

First Advisor

Hung T. Chen

Second Advisor

Teddy Greenstein

Third Advisor

George Y. Lei


Equations relating isobaric vapor-liquid equilibrium data to heats of vaporization are useful in testing the thermodynamic consistency of experimental VLE data and in the design of distillation equipment. Several researchers have proposed such equations based on the Gibbs-Duhem equation. At low pressures, simplified versions of these equations were successfully used to test the consistency of published VLE and enthalpy data. At high pressures, equilibrium phase enthalpy differences were calculated from rigorous equations using a modified form of the Redlich-Kwong equation to calculate fugacity coefficients. As expected, the relative error of using the simplified equations was found to increase with increasing pressure.



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