US4172809A
Expired / Lapsed
US
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Alumina, a method for its preparation and said alumina as carrier containing catalysts
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1978-06-27
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Granted: 1979-10-30
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Expires: 1998-06-27
Abstract
Abstract Process for controlling the porosity of aluminas during the preparation thereof; by forming by extrusion of alumina in the presence of an organic solvent such as an alcohol. The aluminas so prepared are suitable for use as catalyst or preferably as catalyst carriers.
Inventors
- 👤 Andre Triki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:06
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J37/0018; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/882; C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; B01J21/12; B01J35/00; B01J35/60; B01J35/61; B01J35/615; B01J35/63; B01J35/635; B01J35/638; B01J35/66; C01P; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/17; G; G10; G10L; G10L15/00; G10L15/02; G10L2015/025; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/513
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
80 words
In a process for the preparation of aluminas with controlled porosity comprising (a) precipitation of an alumina gel from a solution of an aluminum salt; (b) washing of the gel, as required; (c) at least partial drying of the alumina gel; (d) rewetting of the dried alumina, if required; (e) thereafter forming the alumina by extrusion; (f) calcinating of the extrudates obtained; the improvement to said process comprising effecting the extrusion of the alumina in the presence of an alcohol.
Claim 2
Dependent Claim
80 words
In a process for the preparation of aluminas with controlled porosity comprising (a) precipitation of an alumina gel from a solution of an aluminum salt; (b) washing of the gel, as required; (c) at least partial drying of the alumina gel; (d) rewetting of the dried alumina, if required; (e) thereafter forming the alumina by extrusion; (f) calcinating of the extrudates obtained; the improvement to said process comprising effecting the extrusion of the alumina in the presence of an alcohol.
Claim 3
Dependent Claim
23 words
Process as defined in claim 1, wherein said alcohol is selected from the group consisting of ethanol, methanol, the propanols and the butanols.
Claim 4
Dependent Claim
28 words
Process as defined in claim 2, wherein the quantity of alcohol contained in the alumina upon extrusion is not less than 20% by weight of the solid matter.
Claim 5
Dependent Claim
28 words
Process as defined in claim 2, wherein the quantity of alcohol contained in the alumina upon extrusion is not less than 50% by weight of the solid matter.
Claim 6
Dependent Claim
21 words
Process as defined in claim 3, further comprising said alumina gel being obtained by reaction of sodium aluminate and aluminum chloride.
Claim 7
Dependent Claim
20 words
Process as defined in claim 3, further comprising said alumina gel being obtained by reaction of aluminum nitrate and ammonia.
Claim 8
Dependent Claim
20 words
Process as defined in claim 3, further comprising said alumina gel being obtained by reaction of aluminum chloride and ammonia.
Claim 9
Dependent Claim
33 words
Process as defined in claim 3, further comprising following the washing of the alumina gel with water by washing with a compound selected from the group consisting of the alcohols and the ketones.
Claim 10
Dependent Claim
35 words
Process as defined in claim 3, further comprising drying the alumina gel at a temperature between 40 and 140° C. until a gel is obtained which contains 15 wt. % or more of solid matter.
Claim 11
Dependent Claim
35 words
Process as defined in claim 3, further comprising drying the alumina gel at a temperature between 40° and 140° C. until a xerogel containing from 60 to 90 wt. % of solid matter is obtained.
Claim 12
Dependent Claim
20 words
Process as defined in claim 3, further comprising calcining the alumina gel at a temperature of 300° C. or higher.
Claim 13
Dependent Claim
21 words
Process as defined in claim 3, wherein the precipitation of the alumina gel is effected in the presence of an alcohol.
Claim 14
Dependent Claim
27 words
Process as defined in claim 9, wherein following drying the alumina is rewetted with a liquid at least partially consisting of an effective amount of an alcohol.
Claim 15
Dependent Claim
26 words
Process as defined in claim 10, wherein following calcination the alumina is rewetted with a liquid at least partially consisting of an effective amount of alcohol.
Claim 16
Dependent Claim
27 words
Process as defined in one of claims 1 to 12, wherein the calcination of step (f) is effected at a temperature of not less than 300° C.
Claim 17
Dependent Claim
35 words
Process for the preparation of aluminas as defined in one of claims 1 to 12, wherein during the extrusion of the alumina a silicon compound is incorporated therein which compound is then converted to silica.
Claim 18
Dependent Claim
13 words
Process as defined in claim 16, wherein the silicon compound is tetraethyl orthosilicate.
Claim 19
Dependent Claim
11 words
Process as defined in claim 2 wherein said alcohol is ethanol.
Claim 20
Dependent Claim
13 words
Alumina prepared by a process as defined in claims 1, 3 or 18.
Claim 21
Dependent Claim
40 words
Catalysts for the conversion of hydrocarbons coprising one active phase in the form of at least one metal from groups III to VIII of the Periodic Table combined with a carrier made of an alumina as defined in claim 19.
Claim 22
Dependent Claim
29 words
Catalyst as defined in claim 20 for the hydrodesulfurization of hydrocarbons and the active phase comprises at least one metal from groups VIB and VIII of the Periodic Table.
Claim 23
Dependent Claim
28 words
Alumina according to claim 19 wherein during the extrusion step of said process, a silicon compound is incorporated in said alumina, which compound is then converted to silica.
Claim 24
Dependent Claim
13 words
Alumina according to claim 22, wherein said silicon compound is tetraethyl ortho silicate.
Claim 25
Dependent Claim
40 words
Catalysts for the conversion of hydrocarbons comprising one active phase in the form of at least one metal from groups III to VIII of the Periodic Table combined with a carrier made of an alumina as defined in claim 22.
Claim 26
Dependent Claim
29 words
Catalyst as defined in claim 24, for the hydrodesulfurization of hydrocarbons, wherein the active phase comprises at least one metal from groups VIB and VIII of the Periodic Table.
Claim 27
Dependent Claim
40 words
Catalysts for the conversion of hydrocarbons comprising one active phase in the form of at least one metal from groups III to VIII of the Periodic Table combined with a carrier made of an alumina as defined in claim 23.
Claim 28
Dependent Claim
29 words
Catalyst as defined in claim 26, for the hydrodesulfurization of hydrocarbons, wherein the active phase comprises at least one metal from groups VIB and VIII of the Periodic Table.
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |