MODELING OF THE STATE OF VAPOR-LIQUID EQUILIBRIUM OF HYDROCARBON MIXTURES BASED ON THE TWO-CONSTANT PENG-ROBINSON EQUATION

Problems arising when using Soave-Redlich-Kwong equation and initial Redlich-Kwong equation in the process of numerical modeling are analyzed. The possibility of using a simpler two-consonant Peng-Robinson equation in the modeling process was evaluated, which at the same time will allow to obtain better results than using the Soave-Redlich-Kwong equation. An algorithm for calculating the parameters of the state of the hydrocarbon mixture has been formed. The software implementation of the algorithm is made in the form of a Basic macro, using the LibreOffice Calc tabular processor interface, compatible with the Astpa Linux operating system. Comparison of the results of modeling the state of vapor-liquid equilibrium of a hydrocarbon mixture with experimental data allows us to conclude that the solutions are adequate in the formation of the corresponding mathematical model.