Under the support of Tianjin university’s high tech, we carefully researched Ethylene producing process, Revamped oil wash tower、water wash tower、alkali wash tower、acidic gas absorber、demethanizer、depropanizer、debutanizer、depentanizer condensation liquid stripper、cracking gasoline hydrogenation pre-fractionation tower, and achieved many valuable experience. Because the separation of cracking gas is very complex, especially in oil wash tower. This process contain lot of unit operation, such as the distillation of gasoline、diesel oil、fuel oil with large numbers of vapor , gasoline flash distillation、intermediate heat exchange, gas、liquid、solid separation，gas phase polymerization、coking object entrainment gas phase wash, these unit operation need especially require on packing and internals. So, it is important task for us to develop high flux、high efficiency、low pressure drop、high flexibility、anti-jam packing and tower internals. We have successful apply many patent on oil wash tower and other equipment. This patent has gain excellent effect.