PSRK

PSRK (short for Predictive Soave-Redlich-Kwong)is an estimation method for the calculation of phase equilibria of mixtures of chemical components. The original goal for the development of this method was to enable the estimation of properties of mixtures which contain supercritical components. This class of substances cannot be predicted with established models, for example UNIFAC. PSRK (short for Predictive Soave-Redlich-Kwong)is an estimation method for the calculation of phase equilibria of mixtures of chemical components. The original goal for the development of this method was to enable the estimation of properties of mixtures which contain supercritical components. This class of substances cannot be predicted with established models, for example UNIFAC. PSRK is a group contribution equation of state. This is a class of prediction methods which combines equations of state (mostly cubic) with activity coefficient models based on group contributions, such as UNIFAC. The activity coefficient model is used to adapt the equation of state parameters for mixtures by a so-called mixing rule. The use of an equation of state introduces all thermodynamic relations defined for equations of state into the PRSK model. This allows the calculation of densities, enthalpies, heat capacities, and other properties. As stated previously, the PSRK model is based on a combination of the Soave-Redlich-Kwong equation of state with a mixing rule whose parameters are determined by the UNIFAC method.