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US3860510A Expired / Lapsed US ⏱️ 0.0 years remaining

Combination residue hydrodesulfurization and zeolite riser cracking process

Assignee: Gulf Research and Development Co
•
Filing: 1973-08-22
•
Granted: 1975-01-14
•
Expires: 1993-08-22
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Abstract

Abstract A multiple stage hydrodesulfurization process is described for the catalytic hydrodesulfurization and hydrodemetallization of a residual petroleum oil boiling above the gasoline range followed by a zeolite riser cracking process. The product of the hydrodesulfurization section comprises essentially material boiling above the gasoline range and comprises little material boiling below the initial boiling point of the residual oil feed. The hydrodesulfurization-demetallization section comprises an initial stage involving relatively high hydrogen pressure in the presence of a catalyst comprising a relatively low proportion of catalytically active hydrogenation metals. The process employs a final hydrodesulfurization stage in series having a relatively lower hydrogen pressure and a catalyst comprising a relatively higher proportion of hydrogenation metals. The stream entering the final hydrodesulfurization stage contains an amount up to 10, 20 or even 25 weight percent of the asphaltene content of the charge to the first stage while the effluent from the final stage is essentially free of asphaltenes. The metals content of the final stage effluent is so low that said effluent can be charged without blending with a distillate oil to a fluidized zeolite riser cracking unit (FCC) to produce gasoline and fuel oil. The zeolite catalyst make-up requirement due to metals accumulation on the zeolite catalyst is no greater than zeolite make-up requirement when a distillate gas oil comprises the entire feed to the reactor. The sulfur content of the final stage effluent is so low that the sulfur dioxide content in the zeolite regenerator flue gas is able to meet commercial requirements and so that the fuel oil range product of the FCC operation is sufficiently low that the FCC fuel oil product also meets commercial fuel oil sulfur specifications without requiring further hydrodesulfurization, whereby all hydrodesulfurization can precede the FCC step and no hydrodesulfurization is required after the FCC step. Of course, further desulfurization can follow the FCC step, if such is desired for a specialized requirement.

Inventors

  • 👤 Alfred M Henke
  • 👤 Joel D Mckinney

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 12:50
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/04; C10G2300/00; C10G2300/10; C10G2300/107

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 216 words
A PROCESS FOR PRODUCING GASOLINE FROM A FEED RESIDUAL PETROLEUM OIL CONTAINING ASPHALTENES, METALS AND SULFUR WITHOUT A DISTILLATION OR A SOLVENT EXTRACTION STEP FOR REMOVAL OF ASPHALTENES COMPRISING PRETREATING SAID FEED OIL IN A PLURALITY OF HYDRODESULFURIZATION STAGES IN SERIES INCLUDING AN INITIAL STAGE AND A FINAL STAGE EACH OPERATING AT A HYDROGEN PRESSURE ABOVE 1,000 PSI AND AT A TEMPERATURE BETWEEN ABOUT 650* AND 800*F., EACH STAGE EMPLOYING A CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA, THE CATALYST IN SAID FINAL STAGE COMPRISING A HIGHER WEIGHT PERCENT OF GROUP VI AND GROUP VIII METALS THAN THE CATALYST IN SAID INITIAL STAGE, INCREASING THE TEMPERATURE IN EACH STAGE WITH INCREASING CATALYST AGE TO COMPENSATE FOR CATALYST ACTIVITY AGING LOSS, MAINTAINING A LOWER HYDROGEN PRESSURE IN SAID FINAL STAGE THAN IN SAID INITIAL STAGE, REMOVING ASPHALTENES, METALS AND SULFUR FROM THE FEED OIL IN SAID INITIAL AND SAID FINAL STAGES WITH A GREATER AMOUNT OF METALS AND SULFUR BEING REMOVED FROM THE FEED OIL IN SAID INITIAL STAGE THAN IN SAID FINAL STAGE, SAID PRETREATMENT PRODUCTING A SUBSTANTIALLY ASPHALTENE-FREE HYDRODESULFURIZED EFFLUENT COMPRISING MORE THAN 80 VOLUME PERCENT YIELD BOILING ABOVE THE GASOLINE RANGE BASED ON FEED, AND CONVERTING AT LEAST A PORTION OF SAID ASPHALTENE-FREE EFFLUENT TO GASOLINE IN A ZEOLITE RISER CRACKER.
Claim 2
Dependent Claim 216 words
A PROCESS FOR PRODUCING GASOLINE FROM A FEED RESIDUAL PETROLEUM OIL CONTAINING ASPHALTENES, METALS AND SULFUR WITHOUT A DISTILLATION OR A SOLVENT EXTRACTION STEP FOR REMOVAL OF ASPHALTENES COMPRISING PRETREATING SAID FEED OIL IN A PLURALITY OF HYDRODESULFURIZATION STAGES IN SERIES INCLUDING AN INITIAL STAGE AND A FINAL STAGE EACH OPERATING AT A HYDROGEN PRESSURE ABOVE 1,000 PSI AND AT A TEMPERATURE BETWEEN ABOUT 650* AND 800*F., EACH STAGE EMPLOYING A CATALYST COMPRISING GROUP VI AND GROUP VIII METALS ON ALUMINA, THE CATALYST IN SAID FINAL STAGE COMPRISING A HIGHER WEIGHT PERCENT OF GROUP VI AND GROUP VIII METALS THAN THE CATALYST IN SAID INITIAL STAGE, INCREASING THE TEMPERATURE IN EACH STAGE WITH INCREASING CATALYST AGE TO COMPENSATE FOR CATALYST ACTIVITY AGING LOSS, MAINTAINING A LOWER HYDROGEN PRESSURE IN SAID FINAL STAGE THAN IN SAID INITIAL STAGE, REMOVING ASPHALTENES, METALS AND SULFUR FROM THE FEED OIL IN SAID INITIAL AND SAID FINAL STAGES WITH A GREATER AMOUNT OF METALS AND SULFUR BEING REMOVED FROM THE FEED OIL IN SAID INITIAL STAGE THAN IN SAID FINAL STAGE, SAID PRETREATMENT PRODUCTING A SUBSTANTIALLY ASPHALTENE-FREE HYDRODESULFURIZED EFFLUENT COMPRISING MORE THAN 80 VOLUME PERCENT YIELD BOILING ABOVE THE GASOLINE RANGE BASED ON FEED, AND CONVERTING AT LEAST A PORTION OF SAID ASPHALTENE-FREE EFFLUENT TO GASOLINE IN A ZEOLITE RISER CRACKER.
Claim 3
Dependent Claim 30 words
The process of claim 1 wherein the final temperature in said initial and final stages is about the same and is reached at about the same time in process operation.
Claim 4
Dependent Claim 23 words
The process of claim 1 wherein said asphaltene-free effluent comprises more than 90 volume percent boiling above the gasoline range based on feed.
Claim 5
Dependent Claim 23 words
The process of claim 1 wherein the asphaltene-free effluent comprises more than 95 volume percent boiling above the gasoline range based on feed.
Claim 6
Dependent Claim 23 words
The process of claim 1 wherein the asphaltene-free effluent comprises more than 98 volume percent boiling above the gasoline range based on feed.
Claim 7
Dependent Claim 41 words
The process of claim 1 wherein in said feed pretreating step section the initial stage catalyst deactivation is due primarily to saturative metals-loading on the catalyst and the final stage catalyst deactivation is due primarily to coke formation on the catalyst.
Claim 8
Dependent Claim 38 words
The process of claim 6 wherein said saturative metals-loading occurs when the most saturated portion of the catalyst contains 40 to 50 weight percent of Group VI plus Group VIII metals plus metals deposited from the feed oil.
Claim 9
Dependent Claim 19 words
The process of claim 1 wherein fuel oil and gasoline are recovered from the cracked product without further desulfurization.
Claim 10
Dependent Claim 15 words
The process of claim 1 including a hydrodesulfurization stage between said initial and final stages.

References Cited (Backward Citations)

US3179586A Cited
US3155608A Cited
US3362901A Cited
US3732155A Cited
US3781197A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-01-13 1978-07-15 1979-01-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-01-13 1982-07-15 1983-01-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-01-13 1986-07-15 1987-01-14 $7700.00 Window Closed / Lapsed

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