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


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.



subject category

Thermodynamics; Chemistry


Pereira, LMC; Chapoy, A; Burgass, R; Oliveira, MB; Coutinho, JAP; Tohidi, B

our authors


This research work is part of an ongoing Joint Industrial Project (JIP) conducted jointly at the Institute of Petroleum Engineering, Heriot-Watt University and the UP laboratory of MINES ParisTech. The JIPs is supported by Chevron, GALP Energia, Linde AG Engineering Division, OMV, Petroleum Expert, Statoil, TOTAL and National Grid Carbon Ltd, which is gratefully acknowledged. The participation of National Grid Carbon in the JIP was funded by the European Commission's European Energy Programme for Recovery. The authors would also like to thank the members of the steering committee for their fruitful comments and discussions. Luis M.C. Pereira acknowledges the financial support from Galp Energia through his PhD grant. Mariana B. Oliveira acknowledges for her Post-Doctoral grant (SFRH/BPD/71200/2010). JAPC and MBO work was developed in the CICECO-Aveiro Institute of Materials (Ref. FCT UID /CTM/50011/2013), financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement.

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