Abstract: In the face of weak diesel market, a refinery reduced the diesel over gasoline ratio through optimization of the production schedule of hydrogenation units. Among of them, the kerosene hydrofining unit was expanded to increase jet fuel production of 0.4 Mt/a; the fractionation system of diesel hydrogenation unit was optimized to yield 0.3 Mt/a gasoline blending component by drawing out more side stream; through stopping diesel side stream drawn out, all VGO hydrotreated diesel fractions were sent to FCC unit as feed to increase 0.06 Mt/a gasoline; optimization of hydrocracking unit increased another gasoline component 0.22 Mt/a. These measures reduced the diesel/gasoline ratio from 1.23 to 0.83 and improved the economic benefit of the refinery.

Key words: diesel/gasoline ratio, kerosene hydrofining, diesel hydrotreating, VGO hydrotreating, hydrocracking