Feasibility of carbon dioxide absorption by NaOH solution in a rotating packed bed with blade packings

The rotating packed bed (RPB) with blade packings was applied to absorb carbon dioxide (CO₂) from gas streams by NaOH solution. The RPB with blade packings had an inner radius of 1.6cm, an outer radius of 10.8cm, and an axial height of 3.0cm. Rotational speeds ranged from 600 to 1800rpm, providing 25-225equiv. gravitational force. The removal efficiency of CO₂ was determined at various values of operating parameters, including the rotational speed, gas flow rate, liquid flow rate, NaOH concentration, and CO₂ concentration. Experimental results demonstrated that the removal efficiency of CO₂ increased with the rotational speed, liquid flow rate and NaOH concentration; however, decreased with the gas flow rate and CO₂ concentration. The removal efficiency of CO₂ was about 90% at a rotating speed of 1800rpm, a gas flow rate of 9L/min, a liquid flow rate of 0.5L/min, an NaOH concentration of 1.0mol/L, and a CO₂ concentration of 1vol%. Accordingly, the RPB with blade packings has great potential in the removal of CO₂ from the exhaust gases.