TY - JOUR
T1 - An Overview of the Oil+Brine Two-Phase System in the Presence of Carbon Dioxide, Methane, and Their Mixture
AU - Narayanan Nair, Arun Kumar
AU - Che Ruslan, Mohd Fuad Anwari
AU - Cui, Ronghao
AU - Sun, Shuyu
N1 - Funding Information:
This work was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2019-CRG8-4074.
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/12/14
Y1 - 2022/12/14
N2 - An overview of the molecular simulation studies of the oil+brine two-phase system in the presence of CO2, CH4, and their mixture at geological conditions is presented. The simulation results agreed well with the experimental results and the density gradient theory predictions on the basis of the cubic-plus-association equation of state (CPA EoS) (withDebye-Hückel electrostatic term) and the perturbed chain statistical associating fluid theory (PC-SAFT) EoS. The interfacial tension (IFT) of the alkane+H2O system showed almost a linear increase with an increasing number of carbon atoms in the alkane molecule. These IFTs are approximately equal for linear, branched, and cyclic alkanes. Here, the negative surface excess of the alkanes might explain the increase in the IFTs with an increase in the pressure. The surface excesses of the alkanes increased with decreasing temperature. This may explain the decrease of the slopes in the IFT versus pressure plot with a decrease in the temperature. The IFT behavior of the alkane+water+CH4/CO2system was found to be similar to that observed for the alkane+water system. The addition of CO2had a more significant influence on the IFT than the addition of CH4. Here, CH4and CO2exhibited a positive surface excess. The negative surface excess of the salt ions probably explains the increase in the IFTs of the alkane+brine system with increasing salt content. The solubilities of CH4and/or CO2in the H2O-rich phase of the alkane+brine+CH4/CO2system increased with decreasing salt content (salting-out effect). The IFT of the aromatic hydrocarbon+H2O system is much lower than that of the alkane+H2O system. The surface excess followed the order o-xylene > ethylbenzene > toluene > benzene for the aromatic hydrocarbon+H2O system. This trend has a direct correlation with the aromatic-aromatic interaction.
AB - An overview of the molecular simulation studies of the oil+brine two-phase system in the presence of CO2, CH4, and their mixture at geological conditions is presented. The simulation results agreed well with the experimental results and the density gradient theory predictions on the basis of the cubic-plus-association equation of state (CPA EoS) (withDebye-Hückel electrostatic term) and the perturbed chain statistical associating fluid theory (PC-SAFT) EoS. The interfacial tension (IFT) of the alkane+H2O system showed almost a linear increase with an increasing number of carbon atoms in the alkane molecule. These IFTs are approximately equal for linear, branched, and cyclic alkanes. Here, the negative surface excess of the alkanes might explain the increase in the IFTs with an increase in the pressure. The surface excesses of the alkanes increased with decreasing temperature. This may explain the decrease of the slopes in the IFT versus pressure plot with a decrease in the temperature. The IFT behavior of the alkane+water+CH4/CO2system was found to be similar to that observed for the alkane+water system. The addition of CO2had a more significant influence on the IFT than the addition of CH4. Here, CH4and CO2exhibited a positive surface excess. The negative surface excess of the salt ions probably explains the increase in the IFTs of the alkane+brine system with increasing salt content. The solubilities of CH4and/or CO2in the H2O-rich phase of the alkane+brine+CH4/CO2system increased with decreasing salt content (salting-out effect). The IFT of the aromatic hydrocarbon+H2O system is much lower than that of the alkane+H2O system. The surface excess followed the order o-xylene > ethylbenzene > toluene > benzene for the aromatic hydrocarbon+H2O system. This trend has a direct correlation with the aromatic-aromatic interaction.
UR - http://www.scopus.com/inward/record.url?scp=85143639327&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.2c03089
DO - 10.1021/acs.iecr.2c03089
M3 - Review article
AN - SCOPUS:85143639327
SN - 0888-5885
VL - 61
SP - 17766
EP - 17782
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 49
ER -