Carbon Dioxide Absorption into Aqueous Blends of Potassium Carbonate and Amine

Abstract

In this study, amines were added to aqueous K₂CO₃ solution as a promoter to improve absorption rate. The CO₂ equilibrium partial pressure (PCO₂*) and the absorption rate were measured using vapour-liquid equilibrium (VLE) equipment at the 313, 333 and 353 K condition of flue gas. Results showed that K₂CO₃/ethylenediamine (EDA), K₂CO₃/diethylenetriamine (DETA), K₂CO₃/triethylenetetramine (TETA), K₂CO₃/tetraethylenepentamine (TEPA) solutions had CO₂ equilibrium partial pressure lower than that of monoethanolamine solution at 313 K. In addition, it was found that ethylenediamine was the most effective promoter to increase the absorption rate of aqueous K₂CO₃ solution.