Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Study of the impact of high temperatures and pressures on the equilibrium densities and interfacial tension of the carbon dioxide/water system

Pereira, L. M. C.[Luis M.C.], Chapoy, A.[Antonin], Burgass, R.[Rod], Oliveira, M. B.[Mariana B.], Coutinho, J. A. P.[Joao A.P.], Tohidi, B.[Bahman]
J. Chem. Thermodyn. 2016, 93, 404-415
ABSTRACT
The development of successful and economical CO2 geological storage projects requires a precise estimation of the saturated phase densities and interfacial tension of the CO2/H2O system. The axisymmetric drop shape analysis (ADSA) method was used for measuring the interfacial tension of this system at temperatures over the range (298 to 469) K and pressures up to 69 MPa. The phase densities, required to determine accurate IFT values, were determined by measuring the oscillation period of the equilibrated phases with an Anton Paar densitometer. A correlation to readily determine the density of the CO2-saturated water phase in the range of interest is proposed and the use of pure compound densities for the calculation of the interfacial tension values discussed. The Cubic-Plus-Association equation of state (CPA EoS) was used to estimate the phase behaviour pressure and temperature dependence of the system studied with very good results. Bulk phase properties and influence parameters adjusted to pure compounds surface tensions within the density gradient theory (DGT) were used to predict the CO2/H2O interfacial tensions with remarkably low deviations from the measured values.
Compounds
# Formula Name
1 CO2 carbon dioxide
2 H2O water
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.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • 2
  • Surface tension liquid-gas, N/m ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Pendant drop shape
  • 69
  • POMD
  • 1
  • 2
  • Interfacial tension, N/m ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Pendant drop shape
  • 9
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Vibrating tube method
  • 9
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Vibrating tube method
  • 5
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Gas
  • Temperature, K; Gas
  • Pressure, kPa; Gas
  • Gas
  • Liquid
  • Vibrating tube method
  • 12
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Gas
  • Vibrating tube method
  • 55
  • POMD
  • 1
  • 2
  • Vapor or sublimation pressure, kPa ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Gas
  • Closed cell (Static) method
  • 1