Solubility of Carbon Dioxide in Aqueous Solutions of Three Secondary Amines: 2-(Butylamino)ethanol, 2-(Isopropylamino)ethanol, and 2-(Ethylamino)ethanol Secondary Alkanolamine Solutions
Hwang, S. J.[Sung June], Kim, J.[Junghwan], Kim, H.[Huiyong], Lee, K. S.[Kwang Soon]
Secondary amines have been proposed as potential solvents for CO2 capture. In this study, the CO2 solubility of three secondary alkanolamine aqueous solutions, 2-(butylamino)ethanol (BAE), 2-(isopropylamino)ethanol (IPAE), and 2-(ethylamino)ethanol (EAE), were measured with a pressure range of 0.02 to 395 kPa at 40, 80, and 120 deg C. A static method based on an equilibrium cell unit was used for measurements in high CO2 equilibrium partial pressure regions at over 1 kPa, while the flow method based on a modified gas sparging reactor unit proposed by Kim et al.(2017) was employed for measurements in low pressure regions under 1 kPa. Two amine concentrations, 15 and 30 wt %, were considered for each amine, and their CO2 solubility was represented by the Kent-Eisenberg model. The cyclic CO2 absorption capacity and heat of the reaction for the three secondary alkanolamines were compared with those of monoethanolamine (MEA).
Compounds
#
Formula
Name
1
C6H15NO
2-(butylamino)ethanol
2
C5H13NO
2-isopropylaminoethanol
3
C4H11NO
2-(ethylamino)ethanol
4
H2O
water
5
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.