CO₂ capture into aqueous solutions of 3-methylaminopropylamine activated dimethyl-monoethanolamine

In this work, experimental data and a simplified vapor-liquid equilibrium (VLE) model for the absorption of CO₂ into aqueous solutions of 3-methylaminopropylamine (N-methyl-1,3-propane diamine – MAPA) and dimethyl-monoethanolamine (2-dimethylaminoethanol – DMMEA) are reported. The chemicals were selected based on kinetic, energy and environmental properties for post-combustion CO₂ capture. The effect of the DMMEA/MAPA ratio and the total concentration level of amine were studied. Based on the results of preliminary semi-quantitative tests (screening) the best amine ratios were determined. Two amine concentrations were selected for the VLE study. The result of both the screening and the VLE measurements are compared to the generally used 5 M (30 mass %) monoethanolamine (MEA) solution. The presented systems seem to be better performing than 5 M MEA, and have significantly higher cyclic capacity combined with moderate impact on the environment. ⺠DMMEA/MAPA system as effective CO₂ capture agent. ⺠Selection of the best system based on characterization. ⺠Lower environmental impact than 30 mass % MEA. ⺠Signifficantly higher cyclic capacity than 30 mass % MEA.