Abstract: The FCC gasoline hydroupgrading-desulfurization combined technology （M-PHG） is one of the best technologies to produce clean gasoline, jointly developed by PetrChina Research Institute of Petrochemicals and PetrChina Research Institute of Fushun Petrochemical Company, which organically couples core technologies of FCC gasoline stepwise hydrodesulfurization and olefins directional conversion. The technology reduces the loss of octane number of FCC gasoline during desulfurization and olefin reduction, and has good adaptability for feedstock. In order to meet the quality requirements of China national VI gasoline standard phase B and optimize the composition of gasoline products, the original gasoline hydrogenation unit was retrofitted by means of M-PHG technology in CNPC Qingyang Petrochemical Company. After optimization of operation, the average reduction of the olefin volume fraction of full-distillate gasoline reached 12.1 percentage points, the mass fraction of sulfur in the product was less than 10 μg/g, and the RON loss was less than 1.0 units. After the transformation, the gasoline pool of the whole plant meets the emission standard of vehicle gasoline in phase B of national VI standard.

Key words: FCC gasoline, hydrogenation, olefin, sulfur content, octane munber