US4363719A
Expired / Lapsed
US
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Process for improving the stability of catalysts for the catalytic hydrotreatment of petroleum cuts
Assignee: Elf Antar France
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Filing: 1981-04-28
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Granted: 1982-12-14
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Expires: 2001-04-28
Abstract
Abstract The invention relates to a process to improve the stability of a catalyst to be used for lowering the cloud or turbidity point and the filterability limit temperature of gas-oils. The catalyst is formed of a composite system constituting 5 to 90% of a hydrodesulfuration type catalyst A and 95 to 10% of a hydroconversion type catalyst B, these two catalysts being either mixed or superposed, in which case catalyst A forms the top of the catalytic bed.
Inventors
- 👤 Jacques Bousquet
- 👤 Claude Gueguen
- 👤 Daniel Vautier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:45
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/04; B01J35/00; B01J35/19; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; C; C10; C10G; C10G2400/00; C10G2400/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
In a method for the catalytic hydrotreatment of petroleum cuts containing heavy n-paraffins, the improvement comprising conducting said catalytic hydrotreatment reaction in the presence of a catalyst composition comprising: (a) 5-90% of a catalyst containing a metal from each of Group VI and Group VIII of the Periodic Table on a non-acid or weak acid oxide support; and (b) 95-10% of a catalyst containing a metal from each of Group VI and Group VIII of the Periodic Table on a silica-alumina support having a silica content greater than 5% by weight.
Claim 2
Dependent Claim
91 words
In a method for the catalytic hydrotreatment of petroleum cuts containing heavy n-paraffins, the improvement comprising conducting said catalytic hydrotreatment reaction in the presence of a catalyst composition comprising: (a) 5-90% of a catalyst containing a metal from each of Group VI and Group VIII of the Periodic Table on a non-acid or weak acid oxide support; and (b) 95-10% of a catalyst containing a metal from each of Group VI and Group VIII of the Periodic Table on a silica-alumina support having a silica content greater than 5% by weight.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the amount of said first catalyst is 10-50% and said second catalyst is 90-50%.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said metal is selected from the group consisting of cobalt, nickel and molybdenum.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the support of said first catalyst is alumina having not more than 6% by weight of silica.
Claim 6
Dependent Claim
17 words
The method of claim 1 further comprising positioning said first catalyst on top of said second catalyst.
Claim 7
Dependent Claim
54 words
The method of claim 1, 2, 3, 4 or 5 comprising conducting said catalytic hydrotreatment reaction at a temperature of from 300° C. to 500° C. with an hourly liquid spacial velocity of 0.2h -1 to 6h -1 under pressure of from 1 to 80 bars and with a hydrogen/hydrocarbon molar ratio of 2:10.
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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |