Kozlovskyi S. Thermodynamic properties of binary mixtures of carbon dioxide with methane, ethane and propane.

The thesis is devoted to the analytical description of the thermodynamic behavior of binary mixtures of natural refrigerants. As a result, two forms of uniform equations of state (UES) were proposed to calculate the properties of such mixtures. As a result of the analysis of the available experimental data, three binary mixtures of carbon dioxide with methane, ethane and propane were selected. For these mixtures, the UES was compiled in both forms. The calculated values of the density obtained for each mixture according to the selected forms of UES are compared with the experimental ones. The standard deviations for each mixture and for both forms of UES do not exceed 0,4%. On the basis of UES in the authors form the phase behavior of the studied mixtures was investigated. Based on this study, it was found that these mixtures, except for CO2/C2H6, are non-azeotrope. The mixture of carbon dioxide with ethane at a molar fraction of the latter 0,6 is close to azeotrope.