Process for preparing alumina

Details Process for preparing alumina Process for preparing alumina

1977-03-25

1979-05-15

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252463, 252466PT, 423628, 423625, C01F 702

Patent

active

041548124

ABSTRACT:
An alumina composition comprising a microcrystalline boehmite-pseudoboehmite intermediate having from about 70 to about 85 weight percent of the total amount of Al.sub.2 O.sub.3 present in crystalline 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 reactant concentrations, and rates of addition, temperatures, and pH's in the precipitation are specifically controlled to form the boehmite-pseudoboehmite intermediate.

REFERENCES:
patent: 3520654 (1970-07-01), Carr et al.
patent: 3539468 (1970-11-01), Wright
patent: 3630670 (1971-12-01), Bell et al.
patent: 3864461 (1975-02-01), Miller et al.
patent: 3879310 (1975-04-01), Rigge et al.
patent: 3919403 (1975-11-01), Reillen et al.

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