Mass-Transfer Performance of Carbon Dioxide Capture via Primary and Poly Amine Absorbents: an Initial Comparison Using a Randomly Packed Bed Scrubber

Employing a lab-scale scrubber packed randomly with Rashing ring packing, where experimentally examined the absorption performance of carbon dioxide capturing by using aqueous solutions of primary and poly alkanol amines; the investigations on carbon dioxide capturing were carried out at atmospheric pressure (1 atm), using simulated feed gas of Carbon dioxide balanced with Nitrogen. Monoethanolamine, Diethylenetriamine, and Triethylenetetramine are the primary and poly alkanol amine absorbents examined for this work. The impact of operating conditions, including amine inlet concentrations, liquid flow rates, gas flow rate, lean amine loading, inlet carbon dioxide concentration, absorbent temperature, and alkanol amine type, were examined based on the two-film theory. Regarding the carbon dioxide removal efficiency and volumetric overall mass transfer coefficient based on the gas side, the absorption performance was presented. A lab-scale investigation revealed that employing DETA absorbent possesses higher carbon dioxide removal efficiency of up to 28.9% and a higher mass transfer coefficient of up to 165.7% compared to the conventional MEA absorbent while employing TETA absorbent possesses higher carbon dioxide removal efficiency of up to 18.86%, and higher mass transfer coefficient of up to 69.64% compared to the conventional MEA absorbent. Based on these findings, it is reasonable to assume that DETA would serve as an efficient absorbent for carbon dioxide capture.