TY - JOUR
T1 - The CO2/CH4 gas mixture solubility in ionic liquids [Bmim][Ac], [Bmim][BF4] and their binary mixtures
AU - Shaahmadi, Fariborz
AU - Shahraki, Bahram Hashemi
AU - Farhadi, Asadollah
PY - 2020/2
Y1 - 2020/2
N2 - Design of suitable solvent is important to separate CO2 from natural gas. Ionic liquids, known as “green solvents”, are proper alternatives for conventional solvents in gas sweetening process. In this work, the abilities of ionic liquids 1-butyl-3-methylimidazolium acetate ([Bmim][Ac], 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) and their binary mixtures are experimentally investigated for CO2 separation from CH4. The solubility of CO2/CH4 mixtures (25/75 mol%, 50/50 mol% and 75/25 mol%) in ionic liquids [Bmim][Ac], [Bmim][BF4] and their binary mixtures containing {75 w% [Bmim][Ac] + 25 w% [Bmim][BF4], 50 w% [Bmim][Ac] + 50 w% [Bmim][BF4] and 25 w% [Bmim][Ac] + 75 w% [Bmim][BF4]} are measured at (298.15, 308.15 and 318.15) K for pressures up to 5.0 MPa. The ideal and real CO2/CH4 solubility selectivities for the studied ionic liquids are also reported. Finally, the cubic plus association (CPA) equation of state has been applied to predict the experimental solubilities.
AB - Design of suitable solvent is important to separate CO2 from natural gas. Ionic liquids, known as “green solvents”, are proper alternatives for conventional solvents in gas sweetening process. In this work, the abilities of ionic liquids 1-butyl-3-methylimidazolium acetate ([Bmim][Ac], 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) and their binary mixtures are experimentally investigated for CO2 separation from CH4. The solubility of CO2/CH4 mixtures (25/75 mol%, 50/50 mol% and 75/25 mol%) in ionic liquids [Bmim][Ac], [Bmim][BF4] and their binary mixtures containing {75 w% [Bmim][Ac] + 25 w% [Bmim][BF4], 50 w% [Bmim][Ac] + 50 w% [Bmim][BF4] and 25 w% [Bmim][Ac] + 75 w% [Bmim][BF4]} are measured at (298.15, 308.15 and 318.15) K for pressures up to 5.0 MPa. The ideal and real CO2/CH4 solubility selectivities for the studied ionic liquids are also reported. Finally, the cubic plus association (CPA) equation of state has been applied to predict the experimental solubilities.
KW - Solubility
KW - Gas sweetening
KW - Ionic liquirds
KW - Co2/CH4 selectivity
KW - CPA
UR - https://www.scopus.com/pages/publications/85071608926
U2 - 10.1016/j.jct.2019.105922
DO - 10.1016/j.jct.2019.105922
M3 - Article
SN - 0021-9614
VL - 141
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
M1 - 105922
ER -