Process for hydrotreating metal-contaminated hydrocarbonaceous feedstocks

摘要

The present invention provides a process for hydrotreating a metal-contaminated hydrocarbonaceous feedstock of which at least 60% wt. boils at a temperature 370 DEG C., the process comprising contacting the feedstock at elevated temperature and elevated pressure in the presence of hydrogen with one or more catalyst beds each of a first catalyst, a second catalyst and a third catalyst, wherein (i) the first catalyst comprises a Group VI and/or a Group VIII hydrogenation metal component on an inorganic oxide support having at least 40% of its pore volume in pores with diameters in the range from 17 nm to 25 nm and a surface area in the range from 100 m2/g to 160 m2/g; (ii) the second catalyst comprises a Group VI and/or a Group VIII hydrogenation metal component on an inorganic oxide support having at least 40% of its pore volume in pores with diameters in the range from 3 nm to 17 nm and a surface area in the range from 160 m2/g to 350 m2/g; and (iii) the third catalyst comprises a Group VI and a Group VIII hydrogenation metal component on an inorganic oxide support having at least 40% of its pore volume in pores with diameters in the range from 17 nm to 25 nm and a surface area in the range from 100 m2/g to 160 m2/g; the third catalyst being at least 1.5 times more active for demetallization than the first catalyst at contaminant metal deposition levels less than 5% wt.