Carbon dioxide absorption using ammonia solution in a microchannel

This work dealt with the application of microchannel for CO2 absorption by using ammonia solution. Statistical analysis was used to investigate the main and interaction effects of pressure, temperature, concentration and flow rate of ammonia solution. The feed gas was 10 vol.% CO2 in nitrogen and a T-type microchannel (0.5 × 0.5 × 60 mm3) was used. Increasing temperature, pressure, and concentration enhanced the CO2 capture. At 30 °C, ammonia concentration of 10% with the flow rate of 0.0003 m3 h−1 and 300 kPa, the absorption efficiency was 96.45%. We also studied the effect of operating parameters on the overall volumetric mass transfer coefficient.