Abstract: A domestic refinery took advantage of the good quality and flexible production plan of hydrocracking unit to produce non-diesel products and reduce the diesel yield. The results showed that the unit could process 124.2 kt of FCC diesel and 120.4 kt of straight-run diesel on average every year without implementing the strategy of reducing diesel, the yields of light naphtha, heavy naphtha and jet fuel could reach 46.29%, 53.41% and 46.01%, respectively. In addition, the unit could produce special oil such as No.5 industrial white oil by tapping its potential. Without changing the original design of the hydrocracking unit and the catalyst grading system, the capacity of reducing diesel production could reach 400 kt/a by adjusting the feedstock ratio and properties and optimizing the production scheme.

Key words: hydrocracking, decreasing diesel output, light naphtha, heavy naphtha, jet fuel