US4560545A
Expired / Lapsed
US
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Basic aluminum magnesium carbonate
Assignee: Almirall SA
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Filing: 1984-03-05
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Granted: 1985-12-24
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Expires: 2004-03-05
Abstract
Abstract A process for producing basic aluminum magnesium carbonate, Al 2 Mg 6 (OH) 14 (CO 3 ) 2 .4H 2 O, by carbonating an aluminum hydroxide (Al(OH) 3 ) and magnesium hydroxide aqueous reaction mixture with carbon dioxide in the presence of at least 6 moles of a base selected from the group consisting of ammonia, mono, di or trialkylamines, pyridine or piperidine, per mole of Al 2 O 3 present. The product is useful as an antacid.
Inventors
- 👤 Robert G. W. Spickett
- 👤 Jacinto M. Mauri
- 👤 Jesus E. B. Puchades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:34
CPC Classifications
A; A61; A61P; A61P1/00; A61P1/04; C; C01; C01F; C01F7/00; C01F7/78; C01F7/784; C01F7/785; C01P; C01P2002/00; C01P2002/20; C01P2002/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A process for the preparation of a basic aluminium magnesium carbonate of the formula Al 2 Mg 6 (OH) 14 (CO 3 ) 2 .4H 2 O which comprises heating a mixture of aluminium hydroxide and magnesium hydroxide in the appropriate molecular proportions in the presence of carbon dioxide supplied by passing a stream of carbon dioxide gas through the mixture in an aqueous medium containing ammonia or a water-soluble organic nitrogen-containing base selected from a mono-, di- or tri-alkylamine containing up to 4 carbon atoms in the alkyl radical(s), or pyridine or piperidine, the amount of ammonia or water-soluble organic base present in the reaction mixture being at least 6 moles per mole of Al 2 O 3 present, at a temperature between 70° and 100° C. at atmospheric pressure, and separating the said aluminium magnesium carbonate from the reaction mixture.
Claim 2
Dependent Claim
142 words
A process for the preparation of a basic aluminium magnesium carbonate of the formula Al 2 Mg 6 (OH) 14 (CO 3 ) 2 .4H 2 O which comprises heating a mixture of aluminium hydroxide and magnesium hydroxide in the appropriate molecular proportions in the presence of carbon dioxide supplied by passing a stream of carbon dioxide gas through the mixture in an aqueous medium containing ammonia or a water-soluble organic nitrogen-containing base selected from a mono-, di- or tri-alkylamine containing up to 4 carbon atoms in the alkyl radical(s), or pyridine or piperidine, the amount of ammonia or water-soluble organic base present in the reaction mixture being at least 6 moles per mole of Al 2 O 3 present, at a temperature between 70° and 100° C. at atmospheric pressure, and separating the said aluminium magnesium carbonate from the reaction mixture.
Claim 3
Dependent Claim
15 words
A process according to claim 1 in which the water-soluble organic nitrogen-containing base is triethylamine.
Claim 4
Dependent Claim
43 words
A process according to claim 1 in which the reaction mixture is heated for from 1 through 12 hours at the reflux temperature whilst carbon dioxide is passed through the mixture at a rate sufficient to produce the said basic aluminium magnesium carbonate.
References Cited (Backward Citations)
US2137638A
Cited
US2958626A
Cited
US3092454A
Cited
US3272703A
Cited
GB1059495A
Cited
GB1184332A
Cited
GB1185920A
Cited
US3650704A
Cited
US3714343A
Cited
US3879525A
Cited
US3879523A
Cited
GB1348702A
Cited
US4340493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |