Industrial & Engineering Chemistry Research, Vol.44, No.19, 7451-7457, 2005
Absorption of carbon dioxide at high partial pressures in aqueous solutions of di-isopropanolamine
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.