Gaseous pvTx properties for the binary mixtures of carbon dioxide (CO2) + trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) and carbon dioxide (CO2) + 3,3,3-trifluoropropene (R1243zf)

The gaseous pvTx data of the binary mixtures for carbon dioxide (CO₂) + trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) and CO₂ + 3,3,3-trifluoropropene (R1243zf) were experimentally measured at 5 isotherms from 333.15 K to 393.15 K. The experiment used a Burnett apparatus and the highest experimental pressure exceeded 7 MPa. The standard uncertainties of temperature, pressure and mole fraction are 10 mK, 0.2 ∼ 0.8 kPa and 0.0015, respectively. The relative uncertainty of the molar density is 0.05 %. Based on the experimental data of pure components and mixtures, three-term truncated virial equations of state (EoS) were established. The relative root mean square deviations (RMSD) of virial EoS in calculating density of CO₂ + R1234ze(E) and CO₂ + R1243zf mixtures are 0.15 % and 0.05 %, respectively. The virial EoS obtained in this work were compared with REFPROP 10.0 and the literature data, and the virial coefficients were calculated and compared between the experimental value and the calculated value from virial EoS.