Preparation of silica-alumina macrospheres

Details Preparation of silica-alumina macrospheres Preparation of silica-alumina macrospheres

1977-11-03

1978-12-12

Crasanakis, George

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252455R, B01J 3702

Patent

active

041295226

ABSTRACT:
An improved method of preparing silica-alumina macrospheres is disclosed. An alkali metal silicate solution is acidified with a strong mineral acid and a weak organic acid. The resulting silica sol is admixed with an acidic alumina sol and urea and the mixture is dispersed as droplets in a hot oil bath with the formation of firm spheroidal hydrogel particles. The method insures the formation of firm hydrogel particles which will retain their structural integrity during further processing. The hydrogel spheres are aged, washed, dried and calcined in accordance with prior art methods.

REFERENCES:
patent: 3905916 (1975-09-01), Riley et al.
patent: 3972833 (1976-08-01), Michalko et al.
patent: 3993589 (1976-11-01), Andre et al.
patent: 3998721 (1976-12-01), O'Hara
patent: 4061563 (1977-12-01), Hilfman

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