The phase behavior of carbon dioxide (CO2) and the ionic liquid 1-butyl-3-methylimidazolium chloride ([bmim][Cl]) was measured and correlated at high pressures up to ~40 MPa and at temperatures between 353.15 K and 373.15 K. The solubility data of CO2 in [bmim][Cl] were obtained by observing the bubble point pressure at specific temperatures. A variable-volume view cell, which is a high-pressure equilibrium apparatus, was used to measure the CO2 + [bmim][Cl] system solubility under varying pressure and temperature conditions. In addition, liquid-liquid-vapor (LLV) three-phase behavior was investigated to be able to determine the classification of phase-behavior type by Scott and Konynenburg. Based on the LLV phase behavior, this system most likely has type III phase-behavior. The resulting data showed that carbon dioxide dissolved well in the ionic liquid at low carbon dioxide concentrations, but carbon dioxide solubility dramatically decreased as the mole fraction of carbon dioxide was increased. The experimental data were well fitted by the Peng-Robinson equation of state with a quadratic mixing rule and cubic parameters estimated by the Joback method.
Compounds
#
Formula
Name
1
C8H15ClN2
1-butyl-3-methylimidazolium chloride
2
CO2
carbon dioxide
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
2
1
Vapor or sublimation pressure, kPa ; Liquid mixture 1