Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1982-12-15
1984-12-04
Bernstein, Hiram H.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
23305A, B01D 902
Patent
active
044864027
ABSTRACT:
Process for the preparation of high purity alumina containing less than 0.1 weight percent of residual chlorine starting from impure aluminum chloride solutions, which process comprises a crystallization step to provide aluminum chloride hexahydrate crystals having a diameter of from about 400 to about 4000 micrometers in the presence of hydrochloric acid; washing the aluminum chloride hexahydrate crystals so obtained with pure hydrochloric acid; and pyrohydrolyzing the washed crystals of aluminum chloride hexahydrate at a temperature of from about 700.degree. to about 1300.degree. C., in which pyrohydrolysis a gas is forced through a layer of the washed aluminum chloride hexahydrate so as to remove the gaseous reaction products while obviating any possible movement of the solid by the gas, the process particularly producing transition aluminas simultaneously having a specific surface area greater than 100 m.sup.2 /g and a chlorine content less than 0.1 weight percent.
REFERENCES:
patent: 3406010 (1968-10-01), Holderreed et al.
patent: 4056363 (1977-11-01), Messner
patent: 4264332 (1981-04-01), Ziegenbaig et al.
Bachelard Roland
Barral Robert
Gurtner Bernard
Bernstein Hiram H.
Produits Chimiques Ugine Kuhlmann
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