Absorption of Carbon Dioxide at High Partial Pressures in Aqueous Solutions of Di-isopropanolamine

The process of carbon dioxide (CO 2 ) absorption is analyzed at high partial pressures, in aqueous solutions of di-isopropanolamine (DIPA). The experiments were performed in a stirred tank reactor with a planar and known interfacial area. The variables considered were the DIPA concentration (within a range of 0.0413−1.90 kmol/m 3 ) and the temperature (within an interval of 288−313 K). From the results, we deduce that the absorption process occurs in a moderately fast reaction regime with a second-order kinetic for the amine and a first-order kinetic for the CO 2 . The reaction rate constant for each process was calculated and correlated as a function of temperature.