Calculating the Critical Properties of Multicomponent Mixtures Using the Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) Equations of State, Based on the Binary Interaction Parameters

A way of estimating the binary interaction parameters (below, BIPs) for the semi-empirical Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) equations of state is developed, and an algorithm based on processing experimental data on the critical parameters of binary pairs in multicomponent mixtures is tested. A multivariate algorithm for solving the direct problem of predicting the critical parameters of multicomponent mixtures is also tested. The precisions of the calculations are compared, and the need to use BIPs in calculating the critical properties of multicomponent mixtures according to the SRK and PR equations of state is demonstrated.