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US 11,965,245 B2Granted
Method of producing an alumina dispersible at a pH greater than 8
OwnerAllison L. Hann, Brian C. Peoplesinventors
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Abstract
A method of making an alumina including providing an alumina slurry, aging the slurry, adding a tricarboxylic acid to the aged alumina slurry, further aging the slurry, and spray drying, the method being characterized by the addition of a dicarboxylic acid either at the same time as the tricarboxylic acid, or after the second aging and before the spray drying. The resulting alumina is dispersible at a pH greater than 9.5 above 95% and has a viscosity below 0.4 Pa·S for 10 wt % sols.
Claims6
An acid-modified alumina comprising:
- an alumina modified with a tricarboxylic acid and a dicarboxylic acid to form the acid-modified alumina, the acid-modified alumina being highly dispersible in an aqueous solution at a pH of greater than 8, the acid-modified alumina having a dispersibility above 90% and a viscosity below 5 Pa·S for 10 wt. % sols in the aqueous solution.
Dependencies are inferred from the claim text.