The PVT properties of the (H2 + CO2) mixtures and the (H2 + CO2 + CH4) mixtures in the supercritical region of water are significant for making full use of the gas mixtures in the coal and supercritical water gasification. In this paper, we report PVT measurements of the (0.6005 H2 + 0.3995 CO2), (0.6992 H2 + 0.3008 CO2) and (0.6026 H2 + 0.1948 CO2 + 0.2026 CH4) mixtures (all in mole fractions) at the temperature 673 K and pressures of (0.5 to 25) MPa, measured by a modified Burnett method. The upper bounds of the expanded uncertainties at 95% confidence are 0.2 K for the temperatures, 0.015*p for the pressures, 0.008* for the densities. The density data were compared to those predicted using GERG-2008 equation of state. The deviations between the calculated and experimental data are not more than 0.021*. Furthermore, the densities were found in accordance with the weighted average of the components' existing equations of state using their mole fractions within 0.0076* for all the mixtures in this work. The second and third virial coefficients were determined at the temperature 673 K for hydrogen and all the mixtures investigated.
Compounds
#
Formula
Name
1
N2
nitrogen
2
He
helium
3
H2
hydrogen
4
CH4
methane
5
CO2
carbon dioxide
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.