Greenhouse gases (GHGs) cause global warming and climate change, making their emission and synthesis a global issue. Employing a pilot-scale scrubber packed with a Rashing ring randomly, where experimentally examined the absorption performance of carbon dioxide capturing by using an aqueous solvent 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, Triethylenetetramine, and Diethylenetriamine 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 according to the two-film concept. Regarding the removal of carbon dioxide efficiency and volumetric mass transfer coefficient based on the gas side, the absorption performance was presented. A lab-scale investigation revealed that employing DETA absorbent possesses a higher carbon dioxide removal efficiency of up to 28.9% and a higher coefficient of mass transfer of up to 165.7% in comparison to conventional MEA absorbent while employing TETA absorbent possesses a higher carbon dioxide removal efficiency of up to 18.86% and a higher coefficient of mass transfer of up to 69.64% in comparison to the conventional MEA absorbent. Based on these findings, it is reasonable to assume that DETA would serve as an efficient chemical absorbent for the removal of carbon dioxide.