US4532072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing aluminium containing sols
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1983-11-14
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Granted: 1985-07-30
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Expires: 2003-11-14
Abstract
Abstract This invention relates to aluminium compounds and their preparation. In accordance with the invention a peptizable alumina hydrate is prepared by hydrolyzing an aluminium alkoxide at a water:aluminium ratio at or near the stoichiometric value. One example of an aluminium alkoxide which has been hydrolyzed in accordance with the present invention is aluminium sec-butoxide (Al(OC 4 H 9 ) 3 s ); thus alkoxide has been hydrolyzed at water:aluminium ratios of 3:1 and 4:1 to give peptizable alumina hydrates. Cold water (e.g. at 16°-22° C.) and aluminium alkoxide are preferably brought together to effect the hydrolysis.
Inventors
- 👤 David L. Segal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:18
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A process for the preparation of a sol of an aluminum compound comprising: bringing together cold water and an aluminum alkoxide to form a reaction mixture consisting essentially of water and aluminum alkoxide, the amounts of water and aluminum alkoxide in the reaction mixture being such that the water:alumium ratio is at or near stoichiometric; allowing the water and aluminum alkoxide to react to produce a peptisable aluminum hydrate; and peptising the peptisable aluminum hydrate with a peptising agent in aqueous medium to produce a sol of an aluminum compound.
Claim 2
Dependent Claim
90 words
A process for the preparation of a sol of an aluminum compound comprising: bringing together cold water and an aluminum alkoxide to form a reaction mixture consisting essentially of water and aluminum alkoxide, the amounts of water and aluminum alkoxide in the reaction mixture being such that the water:alumium ratio is at or near stoichiometric; allowing the water and aluminum alkoxide to react to produce a peptisable aluminum hydrate; and peptising the peptisable aluminum hydrate with a peptising agent in aqueous medium to produce a sol of an aluminum compound.
Claim 3
Dependent Claim
13 words
A process as claimed in claim 1 wherein the water:aluminium ratio is 3:1.
Claim 4
Dependent Claim
39 words
A process as claimed in claim 1 wherein the aluminium alkoxide is selected from the group consisting of aluminium sec-butoxide (Al(OC 4 H 9 ) 3 s ) and aluminium isopropoxide (Al(OC 3 H 7 ) 3 i ).
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1 wherein the aluminium alkoxide. is aluminium sec-butoxide and the water:aluminium ratio is 4:1.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1 including the further step of drying the peptisable alumina hydrate to give a peptisable product comprising dried alumina hydrate.
Claim 7
Dependent Claim
13 words
A method according to claim 1 wherein said peptising agent comprises nitric acid.
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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |