US4035261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment of hydrodesulfurization catalyst to improve its microporosity
Assignee: BP PLC
•
Filing: 1975-11-12
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Granted: 1977-07-12
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Expires: 1995-11-12
Abstract
Abstract Desulphurization catalysts particularly CoMo are improved by treating with water free from added salts. The water washing improves the pore size distribution of the catalyst.
Inventors
- 👤 John David Hargrove
- 👤 Graham Keith Hilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:06
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J37/00; B01J37/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
In a method for preparing a catalyst having increased micropore volume for pore diameters below 300 Angstroms and decreased macropore volume for pore diameters above 300 Angstroms, suitable for the hydrodesulphurisation of hydrocarbons, wherein said catalyst comprises from 1- 10% by weight of an iron group metal compound and from 5- 25% by weight of a Group VIA metal compound on a refractory support, selected from the group consisting of alumina, silica and silica-alumina and wherein said method includes the steps of impregnating the support with the iron group metal compound and the Group VIA metal compound, drying and calcining the impregnated support, the invention comprising, the step of treating the catalyst after calcination with water free from added salts, in the liquid phase, at a temperature in the range 20°-100° C. and at atmospheric pressure.
Claim 2
Dependent Claim
136 words
In a method for preparing a catalyst having increased micropore volume for pore diameters below 300 Angstroms and decreased macropore volume for pore diameters above 300 Angstroms, suitable for the hydrodesulphurisation of hydrocarbons, wherein said catalyst comprises from 1- 10% by weight of an iron group metal compound and from 5- 25% by weight of a Group VIA metal compound on a refractory support, selected from the group consisting of alumina, silica and silica-alumina and wherein said method includes the steps of impregnating the support with the iron group metal compound and the Group VIA metal compound, drying and calcining the impregnated support, the invention comprising, the step of treating the catalyst after calcination with water free from added salts, in the liquid phase, at a temperature in the range 20°-100° C. and at atmospheric pressure.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein the treatment is carried out for a length of time between 5 and 500 hours.
Claim 4
Dependent Claim
22 words
A method according to claim 2 wherein the treatment is carried out for a length of time between 20 and 100 hours.
References Cited (Backward Citations)
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Cited
US3493517A
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US3836594A
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US3846341A
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US3920581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |