Kinetics study of CO2 absorption in potassium carbonate solution promoted by diethylenetriamine

In this work,characterization and kinetics of COabsorption in potassium carbonate (KCO) solution promoted by diethylenetriamine(DETA) were investigated.Kinetics measurements were performed using a stirred cell reactor in the temperature range of 303.15–323.15 K and total concentration up to 2.5 kmol m.The density,viscosity,physical solubility,COdiffusivity and absorption rate of COin the solution were determined.The reaction kinetics between COand KCO+DETA solution were examined.Pseudo-first order kinetic constants were also predicted by zwitterion mechanism.It was revealed that the addition of small amounts of DETA to KCOresults in a significant enhancement in COabsorption rate.The reaction order and activation energy were found to be 1.6 and 35.6 kJ mol,respectively.In terms of reaction rate constant,DETA showed a better performance compared to the other promoters such as MEA,EAE,proline,arginine,taurine,histidine and alanine.