Abstract
Theory model based on the concept of so-called “complete scaling” has been extensively developed for multicomponent mixtures. As a result, the equation of state (EOS) for near-critical mixture with given composition has been formulated. To verify the validity of the obtained EOS, it was applied for the description of thermodynamic properties of the fourteen-component mixture modeling a natural gas condensate. The mixture has been studied in our laboratory by the adiabatic calorimetry method. The measurements of the pressure, the derivative (∂P/∂T)ρ,x and heat capacity Cρ,x were carried out for nine isochores in rather wide range of pressures and temperatures including the near-critical region. It has been demonstrated that the proposed EOS describes adequately the experimental data in one- and two-phase region of the mixture with the sufficiently high accuracy. In addition, the analysis of experimental data by means of developed EOS enables us to calculate the dew–bubble curves of the mixture as well as to determine the mixture critical parameters.
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