Abstract: PetroChina Qingyang Petrochemical Company adopts the diesel catalytic conversion technology (DCP-I) developed by the PetroChina Petrochemical Research Institute o to produce more high-octane gasoline and to reduce the diesel-gasoline ratio. Through the transformation of the existing process flow of the catalytic cracking unit, the FCC diesel was reprocessed at the lower nozzle of the second riser. The commercial application results of DCP-I technology show that after recycling catalytic diesel, the diesel-gasoline ratio of the unit is reduced by 0.09, the olefin content in stabilized gasoline is reduced by 0.5 percentage point, and the octane number is increased by 0.4.

Key words: FCC diesel, diesel-gasoline ratio, refining, high-octane gasoline