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Distillation Columns Used in Crude Oil Refining Yuhong Group Distillation Column is a critical piece of equipment in the refining of crude oil. Oil refineries use two main types of distillation columns which s below : Packed Type Columns – A packed distillation column is a vertical tower packed in sections with ceramic raschig rings, ceramic saddles or steel pall rings. The packing material is used to increase the surface area for mass transfer between gas and liquid phases