Modeling mixtures with PC-SAFT: Insights from large-scale parametrization and group-contribution method for binary interaction parameters

Abstract

Vapor/liquid equilibria of mixtures are of utmost importance in the design of chemical processes. Because of the combinatorial complexity of mixtures, the available experimental data is small when considering the large molecular space. To fill this knowledge gap, molecular equations of state like PC-SAFT show promise due to their explicit consideration of intermolecular interactions that can be transferred to mixtures. In this work, we comprehensively assess and exploit PC-SAFT for modeling phase equilibria of mixtures. First, we provide binary interaction parameters for 7861 binary systems for which pure-component parameters and experimental data are available. Bubble and dew point pressures are described with a median deviation of 2.3%. Secondly, we adjust a matrix of binary group/group interaction parameters for the homosegmented and heterosegmented group-contribution (GC) methods for PC-SAFT. Amongst 1389 mixtures that can be described with the GC methods, the median deviation in bubble and dew point pressures are 6.4% for the homosegmented approach and 5.1% for the heterosegmented approach. The detailed analysis shows the importance of hydrogen bonds in mixtures of non-self-associating components with self-associating components. The parametrization is only possible by introducing a fast numerical method to calculate the derivative of bubble and dew point pressures with respect to model parameters.