Abstract: The application of ex-situ truly sulfided hydrotreating catalysts in 1.7 Mt/a naphtha hydrofining, 0.6 Mt/a kerosene hydrofining, 2.2 Mt/a liquid-phase diesel hydrofining and 0.8 Mt/a hydrocracking was introduced. The start-up process of the truly sulfided catalyst can not only avoids the use of sulfiding agent and does not produce waste gas containing hydrogen sulfide and acidic sewage，but also greatly reduces the start-up time. From the beginning of oil feeding to the production of qualified products, the time for naphtha hydrogenation and jet fuel hydrogenation was 21.5 h and 15 h, respectively. The time saving effect of liquid-phase diesel hydrogenation unit was the most obvious, from 130 h to 27 h. It took 14 h from the inlet to the outlet temperature of 300 ℃, which saves more than 30 h compared with the start-up time of the oxidized catalyst.

Key words: ex-situ truly sulfiding, hydrogenation, catalyst, start up