Abstract: The first cycle operation of 2.0 Mt/a residual oil hydrotreating unit was analyzed. The operation results for 15 months show that in the case of capacity 104% of the design load, FZC series catalysts showed good activities in hydrogenation and metal removal. The density, contents of S and N, residual carbon, asphaltene and metals (Ni+V) of the product can meet or even be better than the design values and can be used as a catalytic cracking feed. The negative effects of the inferior raw material, the heat high pressure separator gas entrainment with heavy hydrocarbon, and the circulating hydrogen desulfurization tower foaming, and the high pressure heat exchanger fouling are all overcome by taking corresponding optimization measures.

Key words: residue, hydrotreating, operation analysis, optimization measures