Acceleration of CO2 Reaction with N,N-Diethylethanolamine in Aqueous Solutions by Piperazine

N, N -Diethylethanolamine (DEEA), which can be prepared from renewable resources, represents a candidate alkanolamine for CO 2 removal from gaseous streams. In this work, the reaction of CO 2 with aqueous solutions containing N, N -diethylethanolamine (DEEA) was studied in a stirred cell reactor with a plane, horizontal gas−liquid interface, in the range of temperatures 298−308 K. The DEEA concentration in the aqueous solutions was varied in the range 2−3 kmol/m 3 . The liquid-side mass transfer coefficient and a combined parameter comprising the reaction rate constant and the diffusivity and solubility of CO 2 in DEEA solutions were evaluated. The effect of the addition of piperazine (PIP) as a possible absorption activator was studied, and it was found that even with a small amount of PIP (0.1 kmol/m 3 ) added, the CO 2 absorption rate increased.