TY - JOUR
T1 - The Solubility of Carbon Dioxide and Density for Binary Mixtures of 1-Butyl-3-methylimidazolium Acetate and 1-Butyl-3-methylimidazolium Tetrafluoroborate
AU - Shaahmadi, Fariborz
AU - Shahraki, Bahram Hashemi
AU - Farhadi, Asadollah
PY - 2019/2/14
Y1 - 2019/2/14
N2 - The gas sweetening process requires an efficient solvent
with strong absorption capability to capture acid gases from flue gas.
Absorption can be strong by a chemical formation (as “chemical” absorption) or
simple with no chemical reactions (as “physical” absorption). The purpose of
the present study was to compare the CO2 solubility of the
chemically absorbing ionic liquid, 1-butyl-3-methylimidazolium acetate
([Bmim][Ac]), with the physically absorbing ionic liquid,
1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), as a
function of temperature at (298.15 to 318.15) K for pressure up to 50 bar. In
addition, the CO2 solubility for binary mixtures containing 75%
[Bmim][Ac] + 25% [Bmim][BF4], 50% [Bmim][Ac] + 50% [Bmim][BF4]
and 25% [Bmim][Ac] + 75% [Bmim][BF4] are measured over the same
temperature range. Henry’s law constants are reported for the solubility of CO2 in
the studied pure and mixed ionic liquids. Furthermore, the density of mixed
ionic liquids is experimentally measured in T = 298.15 K,
308.15 K, and 318.15 K. Finally, the partial molar thermodynamic functions of
solvation containing Gibbs free energy, enthalpy, and entropy are evaluated
based on the variation of Henry’s law constants (as a representative of
solubility) with temperature.
AB - The gas sweetening process requires an efficient solvent
with strong absorption capability to capture acid gases from flue gas.
Absorption can be strong by a chemical formation (as “chemical” absorption) or
simple with no chemical reactions (as “physical” absorption). The purpose of
the present study was to compare the CO2 solubility of the
chemically absorbing ionic liquid, 1-butyl-3-methylimidazolium acetate
([Bmim][Ac]), with the physically absorbing ionic liquid,
1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), as a
function of temperature at (298.15 to 318.15) K for pressure up to 50 bar. In
addition, the CO2 solubility for binary mixtures containing 75%
[Bmim][Ac] + 25% [Bmim][BF4], 50% [Bmim][Ac] + 50% [Bmim][BF4]
and 25% [Bmim][Ac] + 75% [Bmim][BF4] are measured over the same
temperature range. Henry’s law constants are reported for the solubility of CO2 in
the studied pure and mixed ionic liquids. Furthermore, the density of mixed
ionic liquids is experimentally measured in T = 298.15 K,
308.15 K, and 318.15 K. Finally, the partial molar thermodynamic functions of
solvation containing Gibbs free energy, enthalpy, and entropy are evaluated
based on the variation of Henry’s law constants (as a representative of
solubility) with temperature.
U2 - 10.1021/acs.jced.8b00784
DO - 10.1021/acs.jced.8b00784
M3 - Article
SN - 0021-9568
VL - 64
SP - 584
EP - 593
JO - Journal of Chemical and Engineering Data
JF - Journal of Chemical and Engineering Data
IS - 2
ER -