| dc.description.abstract | Accurate thermophysical data for the CO2-rich mixtures relevant for carbon capture, transport and storage (CCS) are essential
for the development of the accurate equations of state (EOS) and models needed for the design and operation of the processes
within CCS. Vapor-liquid equilibrium measurements for the binary system CO2+O2 are reported at 218, 233, 253, 273, 288
and 298 K, with estimated standard uncertainties of maximum 8 mK in temperature, maximum 3 kPa in pressure, and
maximum 0.0031 in the mole fractions of the phases in the mixture critical regions, and 0.0005 in the mole fractions outside
the critical regions. These measurements are compared with existing data. Although some data exists, there are little
trustworthy literature data around critical conditions, and the measurements in the present work indicate a need to revise
the parameters of existing models. The data in the present work has significantly less scatter than most of the literature data,
and range from the vapor pressure of pure CO2 to close to the mixture critical point pressure at all six temperatures. With
the measurements in the present work, the data situation for the CO2+O2 system is significantly improved, forming the basis
to develop better equations of state for the system. A scaling law model is fitted to the critical region data of each isotherm,
and high accuracy estimates for the critical composition and pressure are found. The Peng-Robinson EOS with the alpha
correction by Mathias and Copeman, the mixing rules by Wong and Sandler, and the NRTL excess Gibbs energy model is fitted
to the data in the present work, with a maximum absolute average deviation of 0.01 in mole fraction. | nb_NO |
