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

2005; American Chemical Society; Volume: 44; Issue: 19 Linguagem: Inglês

10.1021/ie040255b

1520-5045

Fernando Camacho, Sebastián Sánchez, Rafael Pacheco, Antonio Sánchez, M. Dolores La Rubia,

Membrane Separation and Gas Transport

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/m3) 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.