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

Luís Manuel Cravo Pereira, Antonin Chapoy, Rhoderick William Burgass, Mariana B. Oliveira, Joao A.P. Coutinho, Bahman Tohidi Kalorazi

Research output: Contribution to journalArticle

29 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)404-415
Number of pages12
JournalJournal of Chemical Thermodynamics
Volume93
Early online date14 May 2015
DOIs
Publication statusPublished - Feb 2016

Keywords

  • Carbon dioxide
  • CPA EoS
  • Density gradient theory
  • Interfacial tensions
  • Saturated densities
  • Water

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

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