Carbon Dioxide Absorption Form Mixed Gas In A Rotating Packed Bed

As a novel multiphase contactor,Rotating Packed Bed(RPB) can greatly intensify the Processes of micromixing and mass transfer herein.Recently, RPB has been successfully applied to manufacturing nanomaterials by reactive precipitation and for separation in process industry.The fundamental studies concerning the phenomena of fluid flow and mass transfer within RPB,which can conduce to more detailed understanding for flow characteristics of the gas phase and the discrete liquid particle phase in addition to the mass transfer process in the Packing region,can provide the theoretic support for the application of RPB.The capture of CO₂ in monoethanolamine(MEA) and MEA/piperazine (PZ) solutions was performed in a rotating packed bed with an outer diameter of 360 mm,inner diameter of 60 mm,and axial depth of 50 mm.The effects of various rotating speed,gas-liquid ratio,temperature and absorbent concentration on CO₂ capture efficiency were explored.The experimental results showed that CO₂ capture efficiency and volumetric mass-transfer coefficient(K_Ga) increased with the increase of alkanolamine concentration and temperature in the range of 303 to 333 K.CO₂ capture efficiency and K_Ga increased first and decreased then with the increase of the rotating speed. When the gas flow rate was in the range from 10 to 40 m³/h,the favorable rotating speed was 600-700 rpm.The obtained results indicated that appropriate operating conditions contributed to a high CO₂ capture efficiency.