Measurement and modelling of the interfacial tensions of CO2 + decane-iododecane mixtures at high pressures and temperatures
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Published version
Author(s)
Pan, Z
Trusler, JPM
Type
Journal Article
Abstract
Experimentally determined interfacial tensions (IFTs) of CO2 and decane-iododecane mixtures are reported, with iododecane mass fractions of 0%, 50%, 70%, 90% and 100% over the temperature range of 298 K to 353 K and at pressures from 1 MPa up to the mixture critical point pressure. Measurements were carried out in a thermostatic high-pressure view cell by means of the pendant drop method. It was observed that the volume of a fresh drop of hydrocarbon initially increased, while the IFT decreased, before reaching equilibrium values. These observations correspond to two key mechanisms of CO2 flooding: oil swelling and IFT reduction. The equilibrium IFTs decrease with increasing pressure isothermally until the mixture critical point pressure is reached. The IFTs also increase with increasing mass fraction of iododecane. An empirical model was developed that is able to represent the experimental results with an overall average absolute deviation of 0.2 mN∙m−1. The IFT data were modeled with the square gradient theory coupled with the volume-translated Peng-Robinson equation of state. The temperature-independent influence parameters of decane and iododecane were regressed from their surface tensions, while the influence parameter of CO2 was taken from literature. The theoretical predictions are in good agreement with the experimental results with an average absolute deviation of 0.4 mN∙m−1. Finally, we extend a group-contribution approach for the binary interaction parameters in the Peng-Robinson equation of state to encompass the CH2I functional group, thereby facilitating application of the modelling approach to other systems comprising CO2 or N2 with iodoalkanes.
Date Issued
2022-12-12
Online Publication Date
2023-02-15T16:15:51Z
Date Acceptance
2022-12-06
ISSN
0378-3812
Publisher
Elsevier
Start Page
1
End Page
12
Journal / Book Title
Fluid Phase Equilibria
Volume
566
Copyright Statement
© 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Identifier
https://www.sciencedirect.com/science/article/pii/S0378381222003193?via%3Dihub
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Publication Status
Published
Article Number
ARTN 113700
Date Publish Online
2022-12-07