Process for presulfurizing a desulfurization catalyst used in a hydrodesulfurization unit of petroleum refinery and presulfurization promoter

摘要

Process for presulfurizing a desulfurization catalyst for use in hydrodesulfurization which presulfurization process comprises sulfurizing the fresh metal oxide in said desulfurization catalyst using hydrogen sulfide produced from sulfur-containing compounds in a feed stream, wherein the presulfurization is effected in the presence of a least one compound having at least one mercapto alkylthio group, which is added in a proportion of from 10 ppm to 0.5% by weight with respect to the total amount of said feed stream.