Solubility of carbon dioxide in aqueous solutions of diisopropanolamine and methyldiethanolamine

The solubility of carbon dioxide in aqueous solutions of alkanolamines was measured by means of two experimental methods. The solubility of carbon dioxide was measured at 298 K with a static total pressure apparatus in solutions of water + diisopropanolamine (DIPA) having mass fraction of DIPA equal to 10.1%, 11.0% and 33.9%. The density of the water + DIPA solution was measured continuously during the experiments to investigate the changes in density introduced by the absorption of carbon dioxide. A correlation for the density of CO2-loaded aqueous solutions of DIPA is presented.The solubility of CO2 in aqueous solutions of methyldiethanolamine (MDEA) and of DIPA was measured at atmospheric pressure with a bubbling equipment at various temperatures between 298 and 353 K. The mass fraction of MDEA in the solutions was 10%, 20% and 49% and the mass fraction of DIPA was 10%, 20%, 25% and 35%.