Such mixtures show marked deviations from ideality. PR is certainly NOT recommended for glycol systems, as these contain highly polar molecular functional groups. In such cases, the liquid phase is assumed not to exhibit strong non-ideality in the sense of Raoult's law. In general, an equation of state uses the same expression to calculate component fugacity coefficients in the vapor and liquid phases. The PR (Peng-Robinson) option is an equation of state that is valid for hydrocarbons, light gases, and petroleum mixtures.
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