Use of the Soave modification of the Redlich-Kwong equation of state for phase equilibrium calculations. Systems containing methanol

The Soave modification of the Redlich-Kwong equation of state is used to predict phase equilibrium in mixtures found in acid gas removal processes used to clean gases produced from coal. Binary mixture equilibrium calculations compare favorably with data obtained from the literature, provided a temperature-dependent interaction parameter is used in some cases. Predictions of equilibrium behavior in systems containing methanol were satisfactory if the solute composition in the liquid was limited to approximately 5 mol % nitrogen or 30 mol % for the other components. Parameters evaluated, and their correlations with temperature, were used to illustrate predictions of multicomponent system behavior. The results should be applicable in many systems of industrial interest where the concentration is maintained at levels consistent with those found as upper limits on the accuracy of the Soave equation.