Capturing and storing carbon dioxide (CO2) is now of concern. This work presents a task-specific ionic liquid (TSIL), triethylbutylammonium acetate ([N2224][CH3COO]), for the purpose of trapping CO2 instead of the commonly used organic amine solutions. Since [N2224][CH3COO] has a hydrophilic nature, the CO2 dissolution behavior into [N2224][CH3COO]-nH2O complexes has been investigated in detail, including the absorption rate, absorption capacity, and the ability of repeating absorption. The solubilities of CO2 into [N2224][CH3COO]-1H2O at 0 deg C, 25 deg C, 40 deg C, and 60 deg C from (0.007 up to 30) bar are presented. The results show strong evidence that [N2224][CH3COO]-1H2O is an excellent reversible absorbent for CO2, and the recovered [N2224][CH3COO]-1H2O maintains the same absorption capacity and absorption rate. The CO2 absorption into [N2224][CH3COO]-nH2O mixtures at 25 deg C and pressures up to 30 bar is also studied. It is elucidated that the absorption capacity decreases with the content of water and the rise of operational temperature. The equilibrium constant, Henry s law constant, overall rate constant, and activation energy are also calculated from the experimental data. All evidence indicates that [N2224][CH3COO]-nH2O with low viscosity may have potential to be used as good absorbents for CO2 capture.
Compounds
#
Formula
Name
1
CO2
carbon dioxide
2
H2O
water
3
C12H27NO2
N,N,N-triethylbutanaminium acetate
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.