US3933623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization process
Assignee: Texaco Inc
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Filing: 1974-08-09
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Granted: 1976-01-20
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Expires: 1994-08-09
Abstract
Abstract The deactivation rate of a catalyst used for the high temperature, high space velocity desulfurization of heavy oils is reduced by the incorporation in the catalyst of a small amount of a noble metal.
Inventors
- 👤 Joseph A. Durkin
- 👤 Jitendra A. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:19
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; C10G45/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A process for the hydrodesulfurization of a petroleum oil fraction having an initial boiling point of at least about 500°F. which comprises contacting said fraction in the presence of added hydrogen under hydrodesulfurization conditions including a temperature between about 750° and 850°F. and a space velocity between about 3 and 10 v/v/hr. with a catalyst comprising an iron group metal, oxide or sulfide and a Group VI metal, oxide or sulfide supported on a base comprising a refractory inorganic oxide support selected from the group consisting of alumina, magnesia and zirconia and mixtures thereof and containing between 0 and 5 weight percent silica, said catalyst also containing from 0.1 to 5 percent noble metal by weight based on the catalyst composite.
Claim 2
Dependent Claim
121 words
A process for the hydrodesulfurization of a petroleum oil fraction having an initial boiling point of at least about 500°F. which comprises contacting said fraction in the presence of added hydrogen under hydrodesulfurization conditions including a temperature between about 750° and 850°F. and a space velocity between about 3 and 10 v/v/hr. with a catalyst comprising an iron group metal, oxide or sulfide and a Group VI metal, oxide or sulfide supported on a base comprising a refractory inorganic oxide support selected from the group consisting of alumina, magnesia and zirconia and mixtures thereof and containing between 0 and 5 weight percent silica, said catalyst also containing from 0.1 to 5 percent noble metal by weight based on the catalyst composite.
Claim 3
Dependent Claim
13 words
The process of claim 1 in which the pressure is below 500 psig.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the iron group metal is nickel.
Claim 5
Dependent Claim
13 words
The process of claim 1 in which the iron group metal is cobalt.
Claim 6
Dependent Claim
13 words
The process of claim 1 in which the Group VI metal is molybdenum.
Claim 7
Dependent Claim
13 words
The process of claim 1 in which the Group VI metal is tungsten.
Claim 8
Dependent Claim
12 words
The process of claim 1 in which the noble metal is platinum.
Claim 9
Dependent Claim
12 words
The process of claim 1 in which the noble metal is rhodium.
Claim 10
Dependent Claim
12 words
The process of claim 1 in which the noble metal is iridium.
Claim 11
Dependent Claim
15 words
The process of claim 1 in which the space velocity is between 4 and 8.
Claim 12
Dependent Claim
21 words
The process of claim 1 in which the noble metal is present in an amount between 0.2 and 2.0 wt. percent.
Claim 13
Dependent Claim
13 words
The process of claim 1 in which the refractory inorganic oxide is alumina.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |