Wet scrubbing technology DuPont - Berg, which is used for FCC flue gas Sox, particulate solids. The process mainly includes two parts: EDV wet scrubbing system and effluent treatment system. on the projects of Urumqi petrochemical, Dalian Petrochemical, Harbin Petrochemical, Sinochem Quanzhou, Jinzhou petrochemical, Jinling Petrochemical ect. projects in Chinese,YNT DuPont technology filter have taken 90% market.