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US 7,125,484 B2Granted
Downflow process for hydrotreating naphtha
AssigneeCatalytic Distillation Technologies
InventorLawrence A. Smith, Jr.
Life of this patent
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Abstract
A process for the treatment of light naphtha hydrocarbon streams is disclosed wherein the mercaptans contained therein are reacted with diolefins simultaneous with fractionation into a light stream and a heavy stream. The heavy stream is then simultaneously treated at high temperatures and low pressures and fractionated. The naphtha is then stripped of the hydrogen sulfide in a final stripper.
Claims4
A downflow process for the desulfurization of a fluid cracked naphtha comprising the steps of:
- (a) subjecting a cracked naphtha to thioetherification prior to:
- (b) feeding said fluid cracked naphtha containing organic sulfur, hydrogen, and gas oil compounds to a downflow single pass reactor containing a bed of hydrodesulfurization catalyst;
- (c) contacting said organic sulfur compounds and said hydrogen in the presence of said hydrodesulfurization catalyst at temperature above 500° F. and pressures below 300 psig to provide a boiling mixture in the bed thereby reacting a portion of said organic sulfur compounds with hydrogen to form hydrogen sulfide;
- (d) removing a naphtha product, H2S and hydrogen from said reactor, said naphtha product having a lower sulfur content than the fluid cracked naphtha feed.
1 more element
A process for the desulfurization of a fluid cracked naphtha comprising the steps of:
- (a) feeding hydrogen and a fluid cracked naphtha containing olefins, diolefins, mercaptans and other organic sulfur compounds to a first distillation column reactor containing a bed of thioetherification catalyst;
- (b) concurrently in said first distillation column reactor
- (i) reacting substantially all of the mercaptans with a portion of said diolefins to form a reaction mixture containing sulfides and naphtha
- (ii) fractionating the reaction mixture to separate out a first overheads containing a C5–C6 boiling material substantially free of mercaptans or other organic sulfur compounds and a first bottoms containing a C6+ boiling material containing said sulfides;
- (c) feeding said C6+ bottoms, gas oil and hydrogen to a downflow single pass reactor containing a bed of hydrodesulfurization catalyst;
- (d) contacting said organic sulfur compounds and said hydrogen in the presence of said hydrodesulfurization catalyst at temperature above 500° F. and pressures below 300 psig to provide a boiling mixture in the bed thereby reacting a portion of said organic sulfur compounds with hydrogen to form hydrogen sulfide;
- (e) removing a naphtha product, H2S and hydrogen from said reactor, said naphtha product having a lower sulfur content than the fluid cracked naphtha feed.
4 more elements
Dependencies are inferred from the claim text.