Alumina compositions and processes for preparing them

Details Alumina compositions and processes for preparing them Alumina compositions and processes for preparing them

C - Chemistry, Metallurgy

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C01F 7/02 (2006.01) B01J 21/04 (2006.01) B01J 35/10 (2006.01) C01F 7/34 (2006.01)

Patent

CA 1122381

ABSTRACT OF THE DISCLOSURE An alumina composition comprising a micro- crystalline boehmite-pseudoboehmite intermediate having from about 70 to about 85 weight percent of the total amount of A1203 present in crystal- line form. The composition is prepared by adding aluminum sulfate and sodium aluminate solutions to a mixture of water and aluminum sulfate solution to precipitate alumina and adjusting the pH to a pH higher than the precipitation pH. The re- actant concentrations, and rates of addition, temperatures, and pH's in the precipitation are specifically controlled to form the boehmite- pseudoboehmite intermediate.

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