Patent ID: 8758600

Claim:
A process to reduce the sulfur and nitrogen content of a hydrocarbon oil feedstock containing organosulfur compounds and organonitrogen compounds, the process comprising: a. introducing the hydrocarbon oil feedstock and hydrogen gas to a catalytic reactor; b. conveying a catalytic reactor effluent stream to a high pressure separator to separate a hydrogen stream and a mixed high pressure separator effluent, the mixed high pressure separator effluent including hydrogen sulfide, ammonia, and a hydroprocessed hydrocarbon mixture having a reduced organosulfur compound content and a reduced organonitrogen compound content; c. contacting the mixed high pressure separator effluent with water; d. contacting the mixed high pressure separator effluent with ionic liquid; e. conveying the mixed high pressure separator effluent containing water and ionic liquid to a low pressure separator, wherein the ionic liquid and the hydroprocessed hydrocarbon mixture are retained in contact for a time sufficient for extractive removal of organosulfur compounds to produce hydrocarbons and ionic sulfur-containing derivatives soluble in the ionic liquid, and for extractive removal of organonitrogen compounds to produce hydrocarbons and ionic nitrogen-containing derivatives soluble in the ionic liquid; f. removing water from the low pressure separator; g. purging hydrogen sulfide and ammonia from the low pressure separator; h. conveying a low pressure separator effluent to a fractionator, the low pressure separator effluent including ionic liquid, ionic sulfur-containing derivatives, ionic nitrogen-containing derivatives, and an ionic liquid treated hydrocarbon mixture having a further reduced organosulfur compound content due to extractive removal and a further reduced organonitrogen compound content due to extractive removal; i. removing ionic liquid, ionic sulfur-containing derivatives and ionic nitrogen-containing derivatives from the fractionator; and j. recovering the ionic liquid treated hydrocarbon mixture from the fractionator.