US4120826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodesulfurization catalysts based on supports prepared from rehydratable alumina
Assignee: Wyeth Holdings LLC
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Filing: 1976-06-14
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Granted: 1978-10-17
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Expires: 1996-06-14
Abstract
Abstract Disclosed is a method for producing a hydrodesulfurization catalyst and the catalyst produced thereby. The HDS catalyst is prepared by solution impregnation of an alumina catalyst support which has been made from a rehydratable form of alumina.
Inventors
- 👤 Robert H. Ebel
- 👤 Donald P. Spitzer
- 👤 William Edward Bambrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:43
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J37/06; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/44; C10G45/46
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
139 words
A method of preparing hydrotreating catalysts for catalytic hydrodesulfurization of petroleum, having activated alumina supports, comprising: preparing a partially dehydrated, rehydratable alumina by flash calcining Bayer process hydrated alumina; rehydrating said partially dehydrated alumina with water which contains acid at pH below 7 at rehydration temperature, for the time needed for rehydration; solidifying the rehydrated alumina; mulling the solidified rehydrated alumina with sufficient water to make a mulled mixture suitable for particle forming; forming particles of desired size and configuration from the mulled mixture; drying the formed alumina particles and then calcining same by heating to calcining temperature; impregnating the calcined particles with liquid solutions of soluble compounds which are thermally decomposable to oxides of cobalt or nickel and to oxides of molybdenum or tungsten; and activating the impregnated alumina particles by calcining heat treatment to form hydrotreating catalysts.
Claim 2
Independent Claim
139 words
A method of preparing hydrotreating catalysts for catalytic hydrodesulfurization of petroleum, having activated alumina supports, comprising: preparing a partially dehydrated, rehydratable alumina by flash calcining Bayer process hydrated alumina; rehydrating said partially dehydrated alumina with water which contains acid at pH below 7 at rehydration temperature, for the time needed for rehydration; solidifying the rehydrated alumina; mulling the solidified rehydrated alumina with sufficient water to make a mulled mixture suitable for particle forming; forming particles of desired size and configuration from the mulled mixture; drying the formed alumina particles and then calcining same by heating to calcining temperature; impregnating the calcined particles with liquid solutions of soluble compounds which are thermally decomposable to oxides of cobalt or nickel and to oxides of molybdenum or tungsten; and activating the impregnated alumina particles by calcining heat treatment to form hydrotreating catalysts.
Claim 3
Dependent Claim
16 words
The method of claim 1 including a washing step to remove soda impurities from the alumina.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said forming comprises extruding an aqueous mix of the rehydratable alumina composition.
Claim 5
Dependent Claim
17 words
The method of claim 2 wherein said catalyst support particles are formed in the shape of beads.
Claim 6
Dependent Claim
11 words
A hydrotreating catalyst prepared according to the method of claim 1.
Claim 7
Dependent Claim
11 words
A hydrotreating catalyst prepared according to the method of claim 3.
Claim 8
Dependent Claim
11 words
A hydrotreating catalyst prepared according to the method of claim 4.
Claim 9
Dependent Claim
11 words
A hydrotreating catalyst prepared according to the method of claim 2.
Claim 10
Dependent Claim
53 words
The hydrotreating catalyst prepared according to the method of claim 1 wherein the promoters in the calcined hydrotreating catalyst consist of 2-6% by wt of the catalyst of a member selected from CoO and NiO and 6-24% by wt of the catalyst of a member selected from MoO 3 and WO 3 .
Claim 11
Dependent Claim
16 words
The method of claim 2 including a curing step to harden the molded catalyst support forms.
Claim 12
Dependent Claim
14 words
The method of claim 10 wherein said curing step is a stream treatment step.
Claim 13
Dependent Claim
11 words
A hydrotreating catalyst prepared according to the method of claim 10.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |