1. Study of the impact of high temperatures and pressures on the equilibrium densities and interfacial tension of the carbon dioxide/water system
- Author
-
Luís M.C. Pereira, Bahman Tohidi, Mariana B. Oliveira, Antonin Chapoy, Rod Burgass, and João A. P. Coutinho
- Subjects
Equation of state ,Density gradient ,LINEAR GRADIENT THEORY ,MUTUAL SOLUBILITIES ,SURFACE-TENSION ,Rotational symmetry ,Thermodynamics ,02 engineering and technology ,ELEVATED PRESSURES ,PHASE-BEHAVIOR ,Surface tension ,chemistry.chemical_compound ,020401 chemical engineering ,Phase (matter) ,PLUS WATER ,General Materials Science ,Densitometer ,0204 chemical engineering ,Physical and Theoretical Chemistry ,Oscillation ,ASSOCIATING FLUID THEORY ,021001 nanoscience & nanotechnology ,EQUATION-OF-STATE ,BINARY-MIXTURES ,Atomic and Molecular Physics, and Optics ,chemistry ,13. Climate action ,N-ALKANES ,Carbon dioxide ,0210 nano-technology - 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. Crown Copyright (C) 2015 Published by Elsevier Ltd. All rights reserved.
- Published
- 2016