Process for making acid activated bleaching earth using high sus

Details Process for making acid activated bleaching earth using high sus Process for making acid activated bleaching earth using high sus

1989-05-16

1991-04-16

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

Clay

502 81, B01J 2012, B01J 2030

Patent

active

050082272

ABSTRACT:
A process for making acid-activated bleaching earth from a crude attapulgite clay. A crude is selected which is mildly acidic and contains at least about 90% attapulgite. The process involves treating such clay with low levels of activating acid which are mixed with the dried and ground clay, or spray dried from slurries containing the clay-acid mixture. Advantages include: lower acid costs/unit mass of clay treated, lower production costs (no washing, filtering, or waste treatment steps) and environmental soundness (no harmful environmental waste products are produced).

REFERENCES:
patent: 1492184 (1924-04-01), Weir
patent: 1752721 (1930-04-01), Bierce
patent: 1781265 (1930-11-01), Baylis
patent: 1946124 (1934-02-01), Belden
patent: 2192000 (1940-02-01), Wilson
patent: 2477386 (1949-06-01), McCarter
patent: 2898304 (1959-08-01), Powell et al.

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