Effects of concentration and viscosity on the absorption of CO2 in [N1111][Gly] promoted MDEA (methyldiethanolamine) aqueous solution

The absorption of CO 2 in tetramethylammonium glycinate ([N 1111 ][Gly]) promotedMDEA (methyldiethanolamine) aqueous solution was investigated. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of MDEA and [N 1111 ][Gly] respectively ranged from 0.3 to 0.45 and 0.05 to 0.15. The influences of temperature and concentration on the absorption capacity of CO 2 were determined. The viscosities of CO 2 -unloaded and CO 2 -loaded MDEA-[N 1111 ][Gly] aqueous solutions were measured and correlated. The experiments showed that the absorption rate of CO 2 obviously increased when the MDEA aqueous solution was promoted by [N 1111 ][Gly]. The effects of temperature, concentration and solution viscosity on the absorption rate were illustrated.