Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1979-10-18
1982-01-05
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252313R, 252317, 252463, 423626, 423628, B01J 3700, B01J 3508, B01J 2104, C01F 702
Patent
active
043093124
ABSTRACT:
A method of manufacturing spherical alumina comprising preparing a basic aluminum chloride solution having an aluminum concentration in the range of from 7 wt.% to 12 wt.% and a weight ratio of aluminum to chloride in the range of from 0.3 to 0.8 by reacting gibbsite with an aqueous hydrochloric acid solution at an elevated temperature, preparing an alumina hydrosol having an aluminum concentration in the range of from 9 wt.% to 15 wt.% and a weight ratio of aluminum to chloride in the range of from 0.8 to 1.5 by reacting the thus prepared solution with metallic aluminum at an elevated temperature, commingling this hydrosol with a gelling agent, dispersing the resulting mixture in the form of droplets in a suspending medium thereby to form hydrogel particles, ageing the thus obtained particles in said suspending medium and then an aqueous ammonia, washing with water, drying and calcining. The thus obtained spherical alumina is substantially free from sodium in spite of employing gibbsite as raw material.
REFERENCES:
patent: 2620314 (1952-12-01), Hoekstra
patent: 4032472 (1977-06-01), McCallister
patent: 4108971 (1978-08-01), Takumi et al.
Hashimoto Toshio
Takumi Shizuo
Tatsushima Masaru
Konopka P. E.
Nikki-Universal Co., Ltd.
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