Isochoric measurements of the R23 + CO2 binary system

Isochoric measurements were taken for the R23+CO2 system for both the two-phase and the superheated vapor regions. The isochoric experiment covered a temperature range from 253 to 353 K and a pressure range from 1590 to 5880 kPa. The data in the two-phase region enabled VLE parameters to be derived using a flash method with the Carnahan–Starling–De Santis equation of state (EoS); in addition, the dew point for each isochore was found from the intersection of P–T sequences. The two derived parameters were compared with each other and a good consistency was found. The VLE data for the R23+CO2 system were compared with results in the literature and a fair degree of agreement was found. The measured system showed positive deviation from Raoult’s law that increases with rising of temperature. The P–V–T–x data in the superheated region were compared with the REFPROP 6.01 estimate for a wider temperature range than was previously measured by the Burnett method. The values predicted by the REFPROP 6.01 software show a positive deviation of about 0.4% in the comparison with the experimental data.