Abstract
The motivation for developing a cubic equation of state model having improved capabilities in the vicinity of the critical region and in predicting liquid densities is reviewed. The reliability of the resulting Peng-Robinson equation for predicting volumetric and phase behavior is illustrated for complex hydrocarbon systems. Modifications to improve the performance of the equation for two- and three-phase systems containing water are described. The reliability of the equation for system containing methanol is illustrated using new data on the methanol - carbon dioxide and methanol - propane systems. The agreement between experimental and calculated results is acceptable only over limited regions.
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