LAUSR

CO2 capture using biphasic solvents is a promising technology for a significant reduction in regeneration energy. However, the existing biphasic solvents suffer significant amine loss because volatile tertiary amines with a high concentration (∼60 wt %) are used as the phase separation promoter. To address this drawback, high boiling point physical solvents were employed into aqueous alkanolamines to exploit a biphasic solvent for CO2 capture. We utilized diethylene glycol dimethyl ether (DEGDME) and sulfolane as the phase separation promoters and developed 2-amino-2-methyl-1-propanol (AMP)/monoethanolamine (MEA) blend-based physical–chemical biphasic solvents. Distribution of CO2 loading, amine species, physical solvents, and water in the two phases after CO2 absorption were investigated to optimize the phase separation behavior. 13C NMR analysis indicated that CO2 absorption in an AMP/MEA-based physical–chemical solution is first dominated by CO2 reaction with MEA and then followed by the hydrolysis rea...