Absorption performance of (CO2 + N2) gas mixtures in amino acid ionic liquids promoted N-methyldiethanolamine aqueous solutions

Amino acid ionic liquids (AAILs) including 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium L -lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) were used to enhance the absorption of CO 2 in N -methyldiethanolamine (MDEA) aqueous solutions. The mole fractions of CO 2 in N 2   +   CO 2 gas mixtures ranged from 0.2 to 1.0. The mass fractions of MDEA and AAILs respectively ranged from 0.300 to 0.400 and 0.050 to 0.100. The absorption capacity and absorption rate under series of conditions were presented and the influences of CO 2 partial pressure and the types of AAILs on the absorption performance were demonstrated.