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US 8,007,760 B2Granted
Process for producing enhanced alumina
AssigneeUop LLC
InventorVladislav I. Kanazirev
Life of this patent
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Abstract
The present invention provides an essentially dry method for preparation of enhanced alumina powders. The first step involves rapid calcination of an aluminum compound to produce alumina powder. The alumina powder is mixed with solid ammonium carbonate and a small amount of water. This mixture heats itself although some external heat is helpful to produce ammonium aluminum hydroxycarbonate (dawsonite-type) NH4AlCO3(OH)2 upon curing which is then decomposed to produce enhanced alumina having a specific desired morphology and nano-sized dimensions.
Claims13
A process for producing alumina comprising:
- a) providing a quantity of alumina powder;
- b) mixing said alumina powder with a solid ammonium carbonate and from 5 to 30 weight percent water to form a mixture;
- c) allowing said mixture to cure at a temperature from about 45° to 85° C. to produce ammonium aluminum hydroxycarbonate;
- and
- d) then decomposing said ammonium aluminum hydroxycarbonate at a temperature from about 130° to 320° C. to produce an enhanced alumina.
2 more elements
Dependencies are inferred from the claim text.