METHOD OF PRESULFIDING A HYDROTREATING, HYDROCRACKING OR TAIL GAS TREATING CATALYST

摘要

An improved method of presulfiding a hydrotreatingor hydrocracking catalyst which minimizes sulfur strippingupon start-up of a hydrotreating or hydrocracking reactorutilizing such a catalyst. The method comprises the stepsof contacting a hydrotreating or hydrocracking catalystwith elemental sulfur at a temperature below the meltingpoint of sulfur, thereby forming a sulfur-catalyst mix-ture, and heating the sulfur-catalyst mixture to a temper-ature above the melting point of sulfur. Preferably, thesulfur-catalyst mixture is first mixed with at least onemember selected from the group consisting of high boilingoils and hydrocarbon solvents to form a prewet mixtureprior to heating at a temperature above the melting pointof sulfur. Tail gas treating catalysts are alsopresulfided by these methods.