US4081353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodesulfurization with a specific alumina-supported catalyst
Assignee: Gulf Research and Development Co
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Filing: 1976-10-15
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Granted: 1978-03-28
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Expires: 1996-10-15
Abstract
Abstract A process for the hydrodesulfurization of feedstocks under comparatively low hydrogen partial pressures, i.e. less than about 1200 psig (8.27 MPa) in contact with a catalyst containing a hydrogenation component supported on a particular carrier. The carrier is a substantially silica-free alumina prepared by calcining a material comprising a dried alumina (i) containing from about 1.2 to about 2.6 moles of water of hydration per mole of Al2O3, (ii) having an (020) line width at 14 DEG (2 theta ) at 3/4 maximum intensity of from about 2.0 DEG to about 5.0 DEG , and (iii) having an intensity ratio relative to the intensity at 10 DEG (2 theta ) of about 1.3 to about 5.0.
Inventors
- 👤 William L. Kehl
- 👤 Angelo A. Montagna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:45
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/10; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A hydrodesulfurization process which comprises contacting a sulfur-containing charge stock under mild conditions including a temperature from about 600° to about 1000° F. and a hydrogen partial pressure of from about 50 to about 1200 psig with a hydrodesulfurization catalyst comprising from 2 to 25 weight percent of a metalliferous hydrogenation component on a substantially silica-free alumina hydrate which after drying and before calcining comprises an alumina hydrate: containing from about 1.2 to about 2.6 moles of water of hydration per mole of Al 2 O 3 ; and having an X-ray diffraction pattern wherein the width of the (020) line at 14° (2 θ) at three-fourths maximum intensity is from about 2.0° to about 2.0°; and the intensity ratio relative to the intensity at 10° (2 θ) is about 1.3 to about 5.0.
Claim 2
Dependent Claim
134 words
A hydrodesulfurization process which comprises contacting a sulfur-containing charge stock under mild conditions including a temperature from about 600° to about 1000° F. and a hydrogen partial pressure of from about 50 to about 1200 psig with a hydrodesulfurization catalyst comprising from 2 to 25 weight percent of a metalliferous hydrogenation component on a substantially silica-free alumina hydrate which after drying and before calcining comprises an alumina hydrate: containing from about 1.2 to about 2.6 moles of water of hydration per mole of Al 2 O 3 ; and having an X-ray diffraction pattern wherein the width of the (020) line at 14° (2 θ) at three-fourths maximum intensity is from about 2.0° to about 2.0°; and the intensity ratio relative to the intensity at 10° (2 θ) is about 1.3 to about 5.0.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein said charge stock is a petroleum residual fraction.
Claim 4
Dependent Claim
29 words
A process according to claim 2 wherein the metalliferous hydrogenation component comprises at least one metal selected from the metals of Groups VI and VIII of the Periodic Table.
Claim 5
Dependent Claim
22 words
A process according to claim 3 wherein the hydrodesulfurization catalyst contains in addition a promoting amount of a metal from Group IVB.
Claim 6
Dependent Claim
34 words
A process according to claim 4 wherein the amount of the Group IVB metal based on the metal in the zero valent state is from 1 to 10% by weight of the total catalyst.
Claim 7
Dependent Claim
18 words
A process according to claim 3 wherein the hydrogenation component is a mixture of nickel, cobalt and molybdenum.
Claim 8
Dependent Claim
98 words
A process according to claim 1 wherein the alumina hydrate support is formed by precipitating the alumina hydrate containing from 1.2 to 2.6 moles of water of hydration per mole of Al 2 O 3 by the simultaneous addition of an aqueous solution of an aluminum salt and an aqueous base at a pH between about 4.5 and less than 7 until the addition of the aluminum salt is complete, and thereafter increasing the pH in the precipitation medium by the continued addition of the aqueous base to a pH in the range of about 8 to 10.
Claim 9
Dependent Claim
13 words
A process according to claim 5 wherein the Group IVB metal is titanium.
Claim 10
Dependent Claim
29 words
A process according to claim 5 wherein the sulfur-containing charge stock is a residual petroleum fraction boiling substantially above 950° F. and containing the asphaltene content of the crude.
Claim 11
Dependent Claim
20 words
A process according to claim 1 wherein said alumina has an X-ray diffraction pattern substantially as shown on FIG. 1.
Claim 12
Dependent Claim
140 words
A process according to claim 1 wherein the alumina hydrate support is formed by: precipitating the alumina hydrate containing from 1.2 to 2.6 moles of water of hydration per mole of Al 2 O 3 by the simultaneous addition of an aqueous solution of an aluminum salt and an aqueous base at a pH between about 4.5 and less than 7 until the addition of the aluminum salt is complete; increasing the pH in the precipitation medium by the continued addition of the aqueous base to a pH in the range of about 8 to 10; aging said precipitated alumina hydrate at said increased pH; recovering the precipitate; washing the precipitate; and drying the precipitate to obtain said alumina hydrate: containing from about 1.2 to about 2.6 moles of water of hydration per mole of Al 2 O 3 .
Claim 13
Dependent Claim
52 words
A process in accordance with claim 11 wherein said pH during precipitation of said alumina hydrate is maintained constant at about 5.5; the increased pH by the continued addition of the an aqueous base is about 10; and the alumina hydrate is being aged for about one hour before recovering the precipitate.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |