Abstract
One of the challenges with regard to the aqueous amine-based CO2 capture process is the considerable energy requirement for solvent regeneration. To overcome this challenge, a biphasic solvent was employed in this study. Here, the phase separation behavior of amine blends depending on the characteristic structures of the solvent component was investigated using a turbidity measurement apparatus. Amines were classified as (1) primary/secondary amines or tertiary/sterically hindered amines depending on the CO2 reaction species, such as carbamate and bicarbonate (2) alkyl and alkanolamines, depending on the presence of a hydroxyl group, (3) chain and cyclic amines, and (4) mono- and polyamines depending on the molecular structure. Easy phase separation occurred in solvent blends containing polyamines such as DETA (diethylenetriamine), TETA (triethylenetetramine), and DEEA (2-(diethylamino) ethanol). The types with the greatest potential were the DETA/DEEA blended solvents. A phase separation could be determined based on the difference in the reaction rate with CO2 and the low solubility between the carbamate species of DETA and DEEA.
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This paper is reported in the 11th China-Korea Clean Energy Workshop.
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Lee, J., Hong, Y.K. & You, J.K. Phase separation characteristics in biphasic solvents based on mutually miscible amines for energy efficient CO2 capture. Korean J. Chem. Eng. 34, 1840–1845 (2017). https://doi.org/10.1007/s11814-017-0067-4
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DOI: https://doi.org/10.1007/s11814-017-0067-4