Absorption of CO ₂ in Aqueous Solvents and Regeneration Techniques: Experimental and Modeling Studies

The work aims to study the absorption of CO 2 into aqueous solvent blends of potassium carbonate (K 2 CO 3 ) and 2‐amino 2‐methyl 1‐propanol (AMP) in a batch process. The absorption capacity of CO 2 is analyzed by varying compositions of K 2 CO 3 and AMP as 30 wt% of K 2 CO 3 , 28 wt% of K 2 CO 3 + 2 wt% of AMP, 25 wt% of K 2 CO 3 + 5 wt% of AMP, 20 wt% of K 2 CO 3 + 10 wt% of AMP, 30 wt% of AMP along with 70 wt% H 2 O, respectively. The effects of solvent composition and absorption time on CO 2 loading were studied. The physicochemical properties of each solvent blend, including density, viscosity, pH, alkalinity, and initial carbon loading were investigated experimentally. The 20 wt% K 2 CO 3 and 10 wt% AMP solvent composition achieved 49% capture efficiency within 90 min of absorption time. The solvent regeneration process was conducted for 90 min at 75 °C, 85 °C, and 95 °C to restore the solvent for next cycle. The desorption rate of 20 wt% K 2 CO 3 and 10wt% AMP is higher than 30 wt% AMP. An Aspen Plus model has been developed to compare the absorption and regeneration efficiency of the blended solvents with the experimental results.