Calculation of vapor–liquid equilibria for a 10-component system: comparison of EOS, EOS–GE and GE–Henry’s law models

Vapor–liquid equilibrium (VLE) data for a 10-component system containing H2, CO, CO2, H2O, CH4, C2H6, C3H8, methanol, ethanol and n-propanol have been used to evaluate the performance of several commonly used thermodynamic models for representing multi-component phase equilibrium data. The equation of state (EOS) used is the Soave–Redlich–Kwong (SRK) equation with modified mixing rules. The EOS–GE models used are the predictive Soave–Redlich–Kwong (PSRK) model, the MHV2 “zero pressure” model, and recently proposed “finite pressure” approach. The GE–Henry’s law models used are the three popular activity coefficient models of Wilson, UNIQUAC and NRTL combined with the Henry coefficients derived from gas solubility data. ation of the EOS–GE models to the mixture containing supercritical components such as those present in this work usually requires additional work to obtain binary parameters for the pairs involving these components. Some problems associated with handling supercritical components in the EOS–GE models are discussed and the results are shown for the bubble point pressure and vapor phase compositions at the conditions of pressure equal to 100 bar and temperature in the range of 313–333 K.