The phase behavior of the ternary system consisting of the ionic liquid (IL) 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim+][BF4-]) + carbon dioxide (CO2) + methanol is studied experimentally using the Cailletet apparatus. Experimental data for all phase transitions within a temperature range of (254.64 to 348.17) K, a pressure range of (2.102 to 13.189) MPa and a CO2 fraction range of (40.20 to 69.98) mol% are collected, while the ratio [hmim+][BF4-]:methanol is kept constant at 1:19. Only at CO2 concentrations between 66.47 and 68.04% the usual two-phase, three-phase, two-phase, one-phase transition upon CO2 pressure increase is found. At lower and higher CO2 fractions, the number of phase transitions observed is lower. All observed phase transitions do not involve criticality.
Compounds
#
Formula
Name
1
C10H19BF4N2
1-hexyl-3-methylimidazolium tetrafluoroborate
2
CO2
carbon dioxide
3
CH4O
methanol
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
3
2
1
Vapor or sublimation pressure, kPa ; Gas
Mole fraction - 2; Liquid
Temperature, K; Liquid
Solvent: Amount ratio of component to other component of binary solvent - 3; Liquid