Experimental VLE data for the AMP/PZ/H2O system under relevant water wash conditions for carbon capture applications

Abstract

New vapour liquid equilibrium (VLE) ebulliometric data for 2-Amino-2-methyl-1-propanol (AMP) and Piperazine (PZ) aqueous solutions are presented in this work for a range of temperatures, 30°C, 40°C and 50°C, and AMP:PZ molar ratios of 3:1.5/4:1/6:1 representative of those expected in water wash systems typically located at the top of absorber columns as an effective emission mitigation strategy in post-combustion carbon capture. The scatter in experimental data for AMP and PZ partial pressures suggests that obtaining VLE experimental data at low temperatures and low amine concentrations is challenging, despite its necessity. Experimental VLE data also suggest that an increase in the AMP/PZ ratio, as typically encountered in water wash processes, does not notably impact the volatility of each amine. The newly developed NRTL thermodynamic models in Aspen Plus (Yi et al., 2024) and Matlab (Hartono et al., 2021a) for the quaternary system AMP/Pz/H2O/CO2 show improvements in predicting the volatility of amines.