Verfahren zur Herstellung von Aluminiumoxyd mit ueberwiegendem Gehalt an Trihydrat

Alumina predominating in Al2O3.3H2O, is prepared by reacting Al, having a surface area of 75,000-106 mm2/g., with 3-35 moles liquid H2O per g. atom Al at 50-100 DEG C., at a basic pH, and in the absence of Hg or Hg-compounds. The basic pH may be provided by the presence of 0.0001-0.05 mole per g. at...

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Bibliographic Details
Main Authors D. KE?H,CARL, W. CORNELY,KURT
Format Patent
LanguageGerman
Published 10.12.1970
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:Alumina predominating in Al2O3.3H2O, is prepared by reacting Al, having a surface area of 75,000-106 mm2/g., with 3-35 moles liquid H2O per g. atom Al at 50-100 DEG C., at a basic pH, and in the absence of Hg or Hg-compounds. The basic pH may be provided by the presence of 0.0001-0.05 mole per g. atom Al of alkali metal-, ammonium- or organo substituted ammonium-hydroxide, chloride, carbonate or carboxylate. The Al, which may have been made by atomizing molten Al, may be added in portions, each of which is less than 75% of the total Al, and the reaction of at least one of which is allowed to go to at least 75% completion before adding a subsequent portion. The product may be filtered and dried at 120 DEG C., and in examples comprises a mixture which may contain amorphous alumina, boehmite, bayerite, nordstrandite and gibbsite.
Bibliography:Application Number: DE19651592093