Study On Absorption Of CO₂ And SO₂ From Simulated Industrial Emissions In Rotating Packed Bed

Rotating packed bed is a novel apparatus for mass transfer and chemical reaction. Fluids contact in a highly turbulent state in the rotating packed bed and mass transfer is intensified significantly, leading to a huge enhancement of mass transfer efficiency.This work studied the capture of 10% CO2 and 3% SO2 respectively in the rotating packed bed by using ethanolamine as the absorbent. The capture efficiency of 1.5% SO2 by using ethylenediamine-phosphoric acid solution as the absorbent was also studied, and the effect of rotating speed, ratio of gas to liquid, temperature, concentration of absorbent and different absorbents on the capture efficiency was investigated. In addition, removal of CO2 in the presence of SO2 by using ethanolamine as the absorbent and removal of CO2 in the presence of SO2 by using ethylenediamine-phosphoric acid solution as the absorbent was studied.Experimental results indicated that when using ethanolamine as the absorbent, the rotating speed of 1000rpm and the temperature of 55℃are the optimum conditions for CO2 removal, while the rotating speed of 700rpm and the temperature of 45℃are the optimum conditions for the removal of SO2. The CO2 and SO2 capture efficiency increased with the increase of liquid flow rate and absorbent concentration, and decreased with the increase of gas flow rate. In the presence of SO2, the removal efficiency of CO2 dropped to nearly zero when the concentration of SO2 was higher than 4%(vol). When using ethylenediamine-phosphoric acid solution as the absorbent, the SO2 capture efficiency increased with the increase of liquid flow rate, temperature and ethylenediamine concentration, and decreased with the increase of gas flow rate. Ethylenediamine-phosphoric acid solution domenstrated good selectivity for SO2 absorption and the presence of CO2 had little effect on SO2 absorption when pH was 7.0 and ethylenediamine concentration was 0.3mol·L-...