US4032472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of alumina sol
Assignee: Honeywell UOP LLC
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Filing: 1976-01-07
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Granted: 1977-06-28
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Expires: 1996-01-07
Abstract
Abstract A sufficient amount of alumina is initially digested in aqueous hydrochloric or hydrofluoric acid to provide from about 5 to about 25 wt. % of the aluminum content of the desired alumina sol, and a finely divided aluminum is subsequently digested therein to provide the remaining required amount of alumina. The method enables the digestion reaction to be effected at an increased rate, and affords a sol of improved homogeniety and reproducibility.
Inventors
- 👤 Kenneth R. McCallister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:01
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/02; C01F7/20; C01F7/42; C01F7/428
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
In the manufacture of an alumina sol containing combined chloride or fluoride and from about 13 to about 15 wt. % aluminum wherein metallic aluminum is digested in hydrochloric or hydrofluoric acid, the improvement which comprises first digesting sufficient solid alumina particles in hydrochloric or hydrofluoric acid to provide from about 5 to about 25 wt. % of the aluminum content of the sol product, and thereafter digesting metallic aluminum therein to provide the required remaining amount of aluminum, said hydrochloric or hydrofluoric acid being employed in an amount to provide a sol containing combined chloride or fluoride in from about a 0.5 to about a 2.0 atom ratio with the aluminum content thereof.
Claim 2
Dependent Claim
114 words
In the manufacture of an alumina sol containing combined chloride or fluoride and from about 13 to about 15 wt. % aluminum wherein metallic aluminum is digested in hydrochloric or hydrofluoric acid, the improvement which comprises first digesting sufficient solid alumina particles in hydrochloric or hydrofluoric acid to provide from about 5 to about 25 wt. % of the aluminum content of the sol product, and thereafter digesting metallic aluminum therein to provide the required remaining amount of aluminum, said hydrochloric or hydrofluoric acid being employed in an amount to provide a sol containing combined chloride or fluoride in from about a 0.5 to about a 2.0 atom ratio with the aluminum content thereof.
Claim 3
Dependent Claim
17 words
The improvement of claim 1 further characterized in that said metallic aluminum is a finely divided aluminum.
Claim 4
Dependent Claim
39 words
The improvement of claim 1 further characterized in that hydrochloric acid is employed in an amount to provide a sol containing combined chloride in from about a 1.0 to about a 2.0 atom ratio with the aluminum content thereof.
Claim 5
Dependent Claim
38 words
The improvement of claim 1 further characterized in that said alumina and said aluminum are digested at a temperature of from about 50° to about 125° C. and at a pressure to maintain substantially liquid phase reaction conditions.
Claim 6
Dependent Claim
38 words
The improvement of claim 1 further characterized in that said alumina and said aluminum are digested at a temperature of from about 75° to about 105° C. and at a pressure to maintain substantially liquid phase reaction conditions.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |