Equilibrium CO2 solubility of novel tris(2-aminoethyl) amine as a promoter to N-methyldiethanolamine and 2-amino-2-methyl-1-propanol

Abstract

• An innovative semi-automated stirred-cell apparatus developed for CO 2 absorption. • CO 2 solubility was examined in novel blends of aq. (TAEA + MDEA/AMP) • VLE data was correlated using Modified Kent-Eisenberg and ANN models. • Reaction scheme was analyzed using 13 C NMR and FTIR-ATR. • Speciation and pH of CO 2 absorbed solution were estimated. This study involves the experimental measurements and theoretical analysis of equilibrium CO 2 solubility in a novel activator (tris(2-aminoethyl) amine, TAEA) and its blend with commercial solvents like ( N -methyldiethanol amine, MDEA) and (2-amino-2-methyl-1-propanol, AMP). All the measurements have been conducted at a fixed total amine concentration of 3 M (M) by varying the promoter concentration to (0.1–0.7) in an interval of 0.2 M, and temperatures range from (293.15–323.15) K at different CO 2 partial pressures in the range of 2–500 kPa. The experimental data are modeled using a modified Kent-Eisenberg (KE) equilibrium model and feed forward neural network model. The equilibrium constants linked to TAEA deprotonation and carbamate formation reactions are regressed as a function of CO 2 partial pressure, amine concentration, and temperature to fit the equilibrium CO 2 solubility data using a modified KE model. To know the reaction scheme and recognize the various essential reaction products in the CO 2 -loaded solvents 13 C NMR and FTIR-ATR analysis have been performed.