Absorption of Carbon Dioxide at High Partial Pressures in Aqueous Solutions of Diisopropanolamine

The process of carbon dioxide (CO2) 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 CO2. The reaction rate constant for each process was calculated and correlated as a function of temperature.