TY - JOUR
T1 - On the water content in CO2 + CH4 and CO2-rich mixtures
T2 - experimental and modelling evaluation at temperatures from 233.15 to 288.15 K and pressures up to 15 MPa
AU - Cavalcanti Filho, Valderio
AU - Chapoy, Antonin
AU - Burgass, Rhoderick William
PY - 2020/12
Y1 - 2020/12
N2 - An experimental and modelling investigation of water content in CO2+CH4 and CO2-rich mixtures in equilibrium with hydrates or liquid water was carried out at temperatures between 233.15 and 288.15 K at pressures up to 15 MPa. Some measurements were undertaken in two-phase region, in the presence of hydrates, with liquid and vapour compositions also reported. Predictions from cubic-plus association SRK, SRK incorporating NRTL with Huron-Vidal mixing rules and multiparametric EoS-CG/GERG equations of state were compared with experimental data. In comparison with pure carbon dioxide, the addition of small amounts of impurities (permanent gases and/or hydrocarbons) resulted in a significant reduction in the water content of the fluid phases present. Overall, sCPA showed good agreement with experimental data, although SRK-HV-NRTL gave better results for some cases, despite the use of only two adjustable parameters. By contrast, multiparametric EoS-CG yielded poor representation of the experimental data. In the two-phase region, no matter the equation of state used, a tendency to underestimate water content in the liquid phase was observed.
AB - An experimental and modelling investigation of water content in CO2+CH4 and CO2-rich mixtures in equilibrium with hydrates or liquid water was carried out at temperatures between 233.15 and 288.15 K at pressures up to 15 MPa. Some measurements were undertaken in two-phase region, in the presence of hydrates, with liquid and vapour compositions also reported. Predictions from cubic-plus association SRK, SRK incorporating NRTL with Huron-Vidal mixing rules and multiparametric EoS-CG/GERG equations of state were compared with experimental data. In comparison with pure carbon dioxide, the addition of small amounts of impurities (permanent gases and/or hydrocarbons) resulted in a significant reduction in the water content of the fluid phases present. Overall, sCPA showed good agreement with experimental data, although SRK-HV-NRTL gave better results for some cases, despite the use of only two adjustable parameters. By contrast, multiparametric EoS-CG yielded poor representation of the experimental data. In the two-phase region, no matter the equation of state used, a tendency to underestimate water content in the liquid phase was observed.
KW - CO +CH
KW - CO -Rich mixtures
KW - EoS-CG
KW - SRK+HV+NRTL
KW - Water content
KW - sCPA
UR - http://www.scopus.com/inward/record.url?scp=85092625615&partnerID=8YFLogxK
U2 - 10.1016/j.jngse.2020.103654
DO - 10.1016/j.jngse.2020.103654
M3 - Article
SN - 1875-5100
VL - 84
JO - Journal of Natural Gas Science and Engineering
JF - Journal of Natural Gas Science and Engineering
M1 - 103654
ER -