US3884797A
Expired / Lapsed
US
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Hydrofining-reforming process
Assignee: Union Oil Company of California
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Filing: 1973-09-10
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Granted: 1975-05-20
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Expires: 1993-09-10
Abstract
Abstract Hydrocarbon feedstocks containing organic sulfur are subjected to a two-stage hydrofining treatment. In the first stage a sulfided hydrofining catalyst is utilized to effect hydrodecomposition of the bulk of the sulfur compounds and produce an effluent containing, e.g., about 0.5-10 ppm of residual sulfur. In the second stage, the first stage product is contacted with a molybdenum-Group VIII metal hydrofining catalyst maintained at least partially in a reduced state, so as to effect a substantial and more efficient hydrodecomposition of the remaining sulfur compounds. The two-stage process is particularly useful for the pretreatment of naphtha feedstocks to a subsequent reforming step employing highly sulfur-sensitive catalysts such as the bimetallic platinum-rhenium-alumina composites.
Inventors
- 👤 Jr Starling K Alley
- 👤 Jr Edward C Attane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:44
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; C10G2400/00; C10G2400/02; C10G2400/18; C10G2400/30
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
37 words
CONTACTING SAID FEEDSTOCK PLUS ADDED HYDROGEN WITH A SULFIDED GROUP VIB AND GROUP VIII MIXED-METAL HYDROFINING CATALYST UNDER HYDROFINING CONDITIONS ADJUSTED TO REDUCE THE ORGANIC SULFUR CONTENT OF SAID FEEDSTOCK TO BETWEEN ABOUT 0.5 AND 10 PPM;
Claim 2
Dependent Claim
37 words
CONTACTING SAID FEEDSTOCK PLUS ADDED HYDROGEN WITH A SULFIDED GROUP VIB AND GROUP VIII MIXED-METAL HYDROFINING CATALYST UNDER HYDROFINING CONDITIONS ADJUSTED TO REDUCE THE ORGANIC SULFUR CONTENT OF SAID FEEDSTOCK TO BETWEEN ABOUT 0.5 AND 10 PPM;
Claim 3
Dependent Claim
37 words
contacting said feedstock plus added hydrogen with a sulfided Group VIB and Group VIII mixed-metal hydrofining catalyst under hydrofining conditions adjusted to reduce the organic sulfur content of said feedstock to between about 0.2 and 20 ppm;
Claim 4
Dependent Claim
37 words
contacting said feedstock plus added hydrogen with a sulfided Group VIB and Group VIII mixed-metal hydrofining catalyst under hydrofining conditions adjusted to reduce the organic sulfur content of said feedstock to between about 0.2 and 20 ppm;
Claim 5
Dependent Claim
29 words
A process for the hydrodesulfurization of a sulfur-containing hydrocarbon feedstock, at least a portion of the sulfur in said feedstock appearing in compounds comprising a thiophene ring, which comprises:
Claim 6
Dependent Claim
29 words
A process for the hydrodesulfurization of a sulfur-containing hydrocarbon feedstock, at least a portion of the sulfur in said feedstock appearing in compounds comprising a thiophene ring, which comprises:
Claim 7
Dependent Claim
37 words
contacting said feedstock plus added hydrogen with a sulfided Group VIB and Group VIII mixed-metal hydrofining catalyst under hydrofining conditions adjusted to reduce the organic sulfur content of said feedstock to between about 0.5 and 10 ppm;
Claim 8
Dependent Claim
37 words
contacting said feedstock plus added hydrogen with a sulfided Group VIB and Group VIII mixed-metal hydrofining catalyst under hydrofining conditions adjusted to reduce the organic sulfur content of said feedstock to between about 0.5 and 10 ppm;
Claim 9
Dependent Claim
9 words
separating hydrogen sulfide from the resulting intermediate gasoline product;
Claim 10
Dependent Claim
9 words
separating hydrogen sulfide from the resulting intermediate gasoline product;
Claim 11
Dependent Claim
10 words
separating hydrogen sulfide from the resulting intermediate product oil; and
Claim 12
Dependent Claim
10 words
separating hydrogen sulfide from the resulting intermediate product oil; and
Claim 13
Dependent Claim
31 words
A process as defined in claim 1 wherein the hydrofining catalysts recited in steps (1) and (3) each comprise nickel and/or cobalt plus molybdenum supported on a refractory, porous oxide carrier.
Claim 14
Dependent Claim
10 words
SEPARATING HYDROGEN SULFIDE FROM THE RESL ULTING INTERMEDIATE GASOLINE PRODUCT;
Claim 15
Dependent Claim
10 words
SEPARATING HYDROGEN SULFIDE FROM THE RESL ULTING INTERMEDIATE GASOLINE PRODUCT;
Claim 16
Dependent Claim
26 words
A process as defined in claim 1 wherein the hydrofining catalysts recited in steps (1) and (3) each comprise nickel and molybdenum supported on activated alumina.
Claim 17
Dependent Claim
60 words
contacting said intermediate product oil plus added hydrogen with a hydrogen-reduced, initially substantially sulfur-free molybdenum and Group VIII mixed-metal hydrofining catalyst under hydrofining-sorption conditions adjusted to effect a further substantial reduction in the organic sulfur content thereof and sorption of substantially all of the resulting hydrogen sulfide on said hydrogen-reduced hydrofining catalyst, said hydrofining-sorption conditions including a temperature above 575*F.
Claim 18
Dependent Claim
60 words
contacting said intermediate product oil plus added hydrogen with a hydrogen-reduced, initially substantially sulfur-free molybdenum and Group VIII mixed-metal hydrofining catalyst under hydrofining-sorption conditions adjusted to effect a further substantial reduction in the organic sulfur content thereof and sorption of substantially all of the resulting hydrogen sulfide on said hydrogen-reduced hydrofining catalyst, said hydrofining-sorption conditions including a temperature above 575*F.
Claim 19
Dependent Claim
71 words
CONTACTING SAID INTERMEDIATE GASOLINE PRODUCT PLUS ADDED HYDROGEN WITH A HYDROGEN-REDUCED, INITIALLY SUBSTANTIALLY SULFUR-FREE MOLYBDENUM AND GROUP VIII MIXED-METAL HYDROFINING CATALYST UNDER HYDROFINING-SORPTION CONDITIONS ADJUSTED TO EFFECT A FURTHER SUBSTANTIAL REDUCTION IN THE ORGANIC SULFUR CONTENT THEREOF, TO A LEVEL BELOW ABOUT 2 PPM, AND ALSO TO SORB SUBSTANTIALLY ALL OF THE HYDROGEN SULFIDE THEREBY GENERATED ON SAID HYDROGEN-REDUCED HYDROFINING CATALYST, SAID HYDROFINING-SORPTION CONDITIONS INCLUDING A TEMPERATURE ABOVE ABOUT 575*F; AND
Claim 20
Dependent Claim
71 words
CONTACTING SAID INTERMEDIATE GASOLINE PRODUCT PLUS ADDED HYDROGEN WITH A HYDROGEN-REDUCED, INITIALLY SUBSTANTIALLY SULFUR-FREE MOLYBDENUM AND GROUP VIII MIXED-METAL HYDROFINING CATALYST UNDER HYDROFINING-SORPTION CONDITIONS ADJUSTED TO EFFECT A FURTHER SUBSTANTIAL REDUCTION IN THE ORGANIC SULFUR CONTENT THEREOF, TO A LEVEL BELOW ABOUT 2 PPM, AND ALSO TO SORB SUBSTANTIALLY ALL OF THE HYDROGEN SULFIDE THEREBY GENERATED ON SAID HYDROGEN-REDUCED HYDROFINING CATALYST, SAID HYDROFINING-SORPTION CONDITIONS INCLUDING A TEMPERATURE ABOVE ABOUT 575*F; AND
Claim 21
Dependent Claim
71 words
contacting said intermediate gasoline product plus added hydrogen with a hydrogen-reduced, initially substantially sulfur-free molybdenum and Group VIII mixed-metal hydrofining catalyst under hydrofining-sorption conditions adjusted to effect a further substantial reduction in the organic sulfur content thereof, to a level below about 2 ppm, and also to sorb substantially all of the hydrogen sulfide thereby generated on said hydrogen-reduced hydrofining catalyst, said hydrofining-sorption conditions including a temperature above about 575*F; and
Claim 22
Dependent Claim
71 words
contacting said intermediate gasoline product plus added hydrogen with a hydrogen-reduced, initially substantially sulfur-free molybdenum and Group VIII mixed-metal hydrofining catalyst under hydrofining-sorption conditions adjusted to effect a further substantial reduction in the organic sulfur content thereof, to a level below about 2 ppm, and also to sorb substantially all of the hydrogen sulfide thereby generated on said hydrogen-reduced hydrofining catalyst, said hydrofining-sorption conditions including a temperature above about 575*F; and
Claim 23
Dependent Claim
61 words
A process as defined in claim 1 wherein the liquid hourly space velocity in step (3) is between about 10 and 25. 5. A process as defined in claim 1 wherein step (3) is continued until break-through of hydrogen sulfide in the effluent therefrom, and the catalyst employed therein is then regenerated to remove sulfur therefrom and then placed back on-stream.
Claim 24
Dependent Claim
20 words
subjecting total effluent from step (3) to catalytic reforming in contact with a sulfur-sensitive Group VIII noble metal reforming catalyst.
Claim 25
Dependent Claim
20 words
subjecting total effluent from step (3) to catalytic reforming in contact with a sulfur-sensitive Group VIII noble metal reforming catalyst.
Claim 26
Dependent Claim
20 words
SUBJECTING TOTAL EFFLUENT FROM STEP (3) TO CATALYTIC REFORMING IN CONTACT WITH A SULFUR-SENSITIVE GROUP VIII NOBLE METAL REFORMING CATALYST.
Claim 27
Dependent Claim
20 words
SUBJECTING TOTAL EFFLUENT FROM STEP (3) TO CATALYTIC REFORMING IN CONTACT WITH A SULFUR-SENSITIVE GROUP VIII NOBLE METAL REFORMING CATALYST.
Claim 28
Dependent Claim
31 words
A PROCESS FOR THE HYDRODESULFURIZATION AND REFORMING OF A SULFUR-CONTAINING NAPHTHA FEEDSTOCK, AT LEAST A PORTION OF THE SULFUR IN SAID FEEDSTOCK APPEARING IN COMPOUNDS COMPRISING A THIOPHENE RING, WHICH COMPRISES:
Claim 29
Dependent Claim
31 words
A PROCESS FOR THE HYDRODESULFURIZATION AND REFORMING OF A SULFUR-CONTAINING NAPHTHA FEEDSTOCK, AT LEAST A PORTION OF THE SULFUR IN SAID FEEDSTOCK APPEARING IN COMPOUNDS COMPRISING A THIOPHENE RING, WHICH COMPRISES:
Claim 30
Dependent Claim
19 words
A process as defined in claim 6 whereins said reforming catalyst recited in step (4) comprises platinum and rhenium.
Claim 31
Dependent Claim
33 words
A process as defined in claim 6 wherein steps (3) and (4) are carried out at substantially the same pressure, and wherein hydrogen-rich recycle gas from step (4) is recycled to step (3).
Claim 32
Dependent Claim
30 words
A process as defined in claim 6 wherein the hydrofining catalysts recited in steps (1) and (3) each comprise nickel and/or cobalt molybdenum supported on a refractory, porous oxide carrier.
Claim 33
Dependent Claim
26 words
A process as defined in claim 6 wherein the hydrofining catalysts recited in steps (1) and (3) each comprise nickel and molybdenum supported on activated alumina.
Claim 34
Dependent Claim
22 words
A process as defined in claim 6 wherein the liquid hourly space velocity in step (3) is between about 10 and 25.
Claim 35
Dependent Claim
38 words
A process as defined in claim 6 wherein step (3) is continued until break-through of hydrogen sulfide in the effluent therefrom, and the catalyst employed therein is then regenerated to remove sulfur therefrom and then placed back on-stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |