Interfacial tensions in the (CH4 + CO2 + H2O) system under two- and three-phase conditions
File(s)
Accepted version
Author(s)
Lv, Pengfei
Stevar, Mihaela SP
Trusler, JP Martin
Type
Journal Article
Abstract
Interfacial properties of the (CH4 + CO2 + H2O) system are of great importance in many geotechnical engineering applications. In this study, we report the first experimental measurements of the interfacial tensions in the (CH4 + CO2 + H2O) system under both three-phase (VLLE) and biphasic conditions. The measurements were made by the pendant drop method. The compositions of the coexisting phases were obtained from a previous study of the phase behavior and the phase densities were then calculated from an equation of state. IFTs along five isotherms in the VLLE region and along six isotherms in biphasic region are reported. In the VLLE region, the IFT between the water-rich liquid and the gas phase varied between (33 and 39) mN·m−1, with a sharp increase as the pressure increased along an isotherm towards the upper critical end point. In the same region, the IFT between the water-rich and CO2-rich liquids varied between (30 and 33) mN·m−1. The IFT between the gas phase and the CO2-rich liquid phase was too small to measure accurately but an approximate value was obtained which is consistent with Antonov's equality. In the biphasic region, measurements were made at temperatures up to 423 K and at pressures up to 30 MPa. As observed in other water-gas systems, the IFT declines monotonically along isotherms with increasing pressure and decreases with increasing temperature at constant pressure.
Date Issued
2020-11-01
Date Acceptance
2020-07-18
Citation
Fluid Phase Equilibria, 2020, 522, pp.1-13
ISSN
0378-3812
Publisher
Elsevier BV
Start Page
1
End Page
13
Journal / Book Title
Fluid Phase Equilibria
Volume
522
Copyright Statement
© 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Qatar Shell Research and Technology Center QSTP LLC
Identifier
https://www.sciencedirect.com/science/article/pii/S0378381220303083?via%3Dihub
Grant Number
490000724
Subjects
Chemical Engineering
0203 Classical Physics
0306 Physical Chemistry (incl. Structural)
0904 Chemical Engineering
Publication Status
Published
Article Number
112760
Date Publish Online
2020-07-23