Amino acid salts are promising absorptions for CO2 capture. This work investigated six common potassium amino acid solutions: L-proline, sarcosine, glycine, β-alanine, taurine, and L-threonine solutions using wetted-wall column at 313 K and atmospheric pressure (1 bar). We found potassium L-proline solution has significant mass transfer properties similar to 30 wt% MEA. The influence of total pressure in wetted-wall column on CO2 absorption rate in potassium L-prolinate solutions is determined. It is found that elevated total pressure has positive effect on CO2 absorption rate. The CO2 absorption flux increases approximately by 40% from 1 bar to 3 bar when CO2 inlet concentration is 10%. What's more, the gas side mass transfer coefficient is found not only dependent on the hydrodynamic conditions of wetted-wall column, but also the total pressure in the apparatus. The analytical relations between the hydrodynamic conditions of the column and kg in wetted-wall column at different pressures are got in this work, and the gas mass transfer coefficient kg is found decreases by 86% from 1 bar to 3 bar.
Fang, M., Zhou, X., Xiang, Q., Cai, D., & Luo, Z. (2015). Kinetics of CO2 Absorption in Aqueous Potassium L-prolinate Solutions at Elevated Total Pressure. In Energy Procedia (Vol. 75, pp. 2293–2298). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2015.07.420