Study on removal of SO_2 by stabilized chlorine dioxide

With the stabilized chlorine dioxide solution as oxidation absorbent,the absorption of gas-liquid countercurrent operation is run in the packed tower.With spectrophotometry of pararosaniline hydrochloride as the analytical tool,the various operating factors on the SO2 removal rate are studied.The results show that when the packing height is more than 20 cm,the concentration of chlorine dioxide is about 0.6 g/L,pH value is 3.47,the ratio of liquid to gas is 46.668,the removal efficiency of sulfur dioxide could achieve more than 99.95%;Under the experimental conditions,the concentration of chlorine dioxide plays the most significant influence on the removal efficiency of sulfur dioxide,which would decrease to 99.91% from 99.97% when its concentration decreases to 0.2 g/L from 1.0 g/L;The sulfur dioxide removal efficiency is less affected by the pH value of absorption solution,packing height and the liquid to gas ratio.The products after oxidized and absorbed include HCl and H2SO4 mainly,which can be recovered easily.