CO2 Capture Using Aqueous Potassium Carbonate Promoted by Ethylaminoethanol: A Kinetic Study

Abstract

Kinetics of absorption of CO2 in an aqueous potassium carbonate (K2CO3) promoted by ethylaminoethanol (EAE) solution (hereafter termed as APCE solvent) was investigated in a glass stirred cell reactor by employing a fall in pressure technique. The reaction chemistry associated with the CO2–APCE solvent system was described by the zwitterion mechanism. The solubility and diffusivity of CO2 in the APCE solvent were experimentally determined at different experimental conditions. Furthermore, the effect of the initial EAE concentration (0.6–2 kmol/m3) and reaction temperature (303–318 K) on the rate of absorption of CO2 was studied in detail. The experimental findings show that with the increase in the EAE concentration and reaction temperature, the rate of CO2 absorption in the APCE solvent also increases considerably. Kinetic measurements further confirm that the absorption of CO2 in the APCE solvent belongs to the fast reaction regime with first-order kinetics with respect to EAE and first-order kinetics w...