US 6,277,271 B1 · Process for the desulfurization of a hydrocarbonaceoous oil

Abstract

A process for the desulfurization of hydrocarbonaceous oil wherein the hydrocarbonaceous oil and a recycle stream containing sulfur-oxidated compounds is contacted with a hydrodesulfurization catalyst in a hydrodesulfurization reaction zone to reduce the sulfur level to a relatively low level and then contacting the resulting hydrocarbonaceous stream from the hydrodesulfurization zone with an oxidizing agent to convert the residual, low level of sulfur compounds into sulfur-oxidated compounds. The residual oxidizing agent is decomposed and the resulting hydrocarbonaceous oil stream containing the sulfur-oxidated compounds is separated to produce a stream containing the sulfur-oxidated compounds and a hydrocarbonaceous oil stream having a reduced concentration of sulfur-oxidated compounds. At least a portion of the sulfur-oxidated compounds is recycled to the hydrodesulfurization reaction zone.

Claims24

Dependent claims

A process for the desulfurization of a hydrocarbonaceous oil which process comprises:

(a) contacting said hydrocarbonaceous oil with a hydrodesulfurization catalyst in a hydrodesulfurization reaction zone at hydrodesulfurization conditions to produce hydrogen sulfide and a resulting first hydrocarbonaceous oil stream having a reduced concentration of sulfur;
(b) contacting said first hydrocarbonaceous oil stream having a reduced concentration of sulfur with an oxidizing agent in a sulfur oxidation zone to convert sulfur-containing compounds into sulfuroxidated compounds and to produce a sulfur oxidation zone effluent containing a residual oxidizing agent;
(c) decomposing at least a portion of said residual oxidizing agent in the sulfur oxidation zone effluent;
(d) separating at least a portion of said sulfur-oxidated compounds from the effluent produced in step (c) to produce a second hydrocarbonaceous oil stream having a reduced concentration of sulfur and a stream comprising sulfur-oxidated compounds;
(e) recycling at least a portion of said sulfur-oxidated compounds to said hydrodesulfurization reaction zone of step (a);
and
(f) recovering said second hydrocarbonaceous oil stream having a reduced concentration of sulfur.

4 more elements

A process for the desulfurization of a hydrocarbonaceous oil which process comprises:

(a) contacting said hydrocarbonaceous oil with a hydrodesulfurization catalyst in a hydrodesulfurization reaction zone at hydrodesulfurization conditions to produce hydrogen sulfide and a resulting first hydrocarbonaceous oil stream having a reduced concentration of sulfur;
(b) contacting said first hydrocarbonaceous oil stream having a reduced concentration of sulfur with an aqueous oxidizing solution in a sulfur oxidation zone to produce a second hydrocarbonaceous oil stream comprising sulfur-oxidated compounds and a residual aqueous oxidizing solution;
(c) decomposing at least a portion of said residual aqueous oxidizing solution in said second hydrocarbonaceous oil stream;
(d) contacting the effluent stream from step (c) comprising sulfuroxidated compounds with a selective solvent having a greater solvent selectivity for said sulfur-oxidated compounds than for sulfur-free hydrocarbonaceous oil to produce a solvent containing at least a portion of said sulfur-oxidated compounds and a third hydrocarbonaceous oil stream having a reduced concentration of sulfur-oxidated compounds;
(e) recycling at least a portion of said sulfur-oxidated compounds to said hydrodesulfurization reaction zone of step (a);
and
(f) recovering said third hydrocarbonaceous oil stream.

4 more elements

Dependencies are inferred from the claim text.

Process for the desulfurization of a hydrocarbonaceoous oil

Life of this patent

Process for the desulfurization of a hydrocarbonaceoous oil

Life of this patent

Abstract

Claims24