Densities of CO2/N2/O2 ternary mixtures at temperatures from (300.15 to 353.15) K and pressures from (5 to 18) MPa

Abstract

As a thermodynamic property, the density of CO 2 mixtures plays an important role on carbon capture and storage. The densities of two CO 2 /N 2 /O 2 ternary mixtures were measured at temperatures from (300.15–353.15) K and pressures from (5–18) MPa using a high-precision magnetic suspension balance. The temperature and pressure uncertainties were 0.01 K and 0.005 MPa, respectively. The density measurement uncertainty was estimated as 0.138 kg·m −3 . Impurities decreased the density of pure CO 2 and the more the impurities were, the larger the reduction was. The densities of mixtures were calculated using GERG-2008 EOS and compared with experimental data. When the temperature and pressure were far away from the critical region, the discrepancy between the experimental data and GERG-2008 EOS calculations was small.