The solubilities of CO2 in four azole-based deep eutectic solvents (DESs), prepared from azoles (imidazole, Im; 1,2,4-triazole,Tri) and acetylcholine chloride (ACC), were reported at temperatures -ranging from 303.15 K to 333.15 K under pressures up to 600.0 kPa using isochoric saturation method. Henry's constants and thermodynamic properties such as standard Gibbs free energy, enthalpy, and entropy changes of CO2 solvation were obtained by correlating the solubility data. Results demonstrated that ACC-Im DESs (Hm= 1.91- 4.46 MPa*kg*mol-1) possess higher capacities of CO2 than CC-Tri ones (Hm= 2.66- 4.58 MPa*kg*mol-1). The solubility of CO2 increased with rising pressure as well as mole ratio of Im to ACC and decreasing temperature. The enthalpies of solution were negative at all conditions. The dissolution capacities of present DESs for CO2 were further compared with those of other DESs as well as some ionic liquids.
Compounds
#
Formula
Name
1
CO2
carbon dioxide
2
C7H16ClNO2
acetylcholine chloride
3
C3H4N2
1H-imidazole
4
C2H3N3
1H-1,2,4-triazole
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
2
4
Molality, mol/kg - 1 ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Solvent: Amount ratio of component to other component of binary solvent - 2; Liquid
Liquid
Gas
phase equilibration
28
POMD
1
2
3
Molality, mol/kg - 1 ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Solvent: Amount ratio of component to other component of binary solvent - 2; Liquid