For vapor-liquid equilibrium calculations, the K-value is defined as the ratio of the mole fraction of a component in the vapor phase to that in the liquid phase:
Ki = yi/xi
For liquid-liquid equilibria calculations, a corresponding equilibrium ratio or distribution coefficient is defined as the mole fraction of a component in the first liquid phase to that in the second liquid phase:
KDi = xIi/xIIi
K-values can be predicted using various methods including Equations of State (EOS) such as SRK and PR. The kij is a term in an EOS called a binary interaction parameter which corrects for interactions between dissimilar pairs of components in a mixture so that the phase equilibrium of the mixture can be accurately predicted. For more detailed information see the Reference Manual.
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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