Engelhard Minerals & Chemicals Corporation

Jack A Tiethof

Frank Pitts

Robert A Burns

A novel sorptive clay product is formed by treating attapulgite clay with sodium silicate and heating to expel moisture such that the product contains about 7-20% total volatile matter. Acid may also be added such that the pH of aqueous slurry is in the range 5 to 10. This sorptive clay product exhibits water and oil absorption and resistance to wet breakdown equivalent to higher-temperature activated attapulgite products.

Sorptive clay composition and method of manufacture

Aluminum metal is activated with hydrochloric acid and then reacted with an aqueous solution of sulfur dioxide to produce an aluminum hydrosulfite (dithionite) liquor useful for bleaching materials such as clay. The aluminum hydrosulfite can be converted to a sodium hydrosulfite liquor by precipitating aluminum with a sodium base.

Hydrosulfite preparation

An improved method for producing iron hydrosulfite liquor by reduction of sulfur dioxide with metallic iron is disclosed. Also disclosed are improvements in the conversion of the iron hydrosulfite liquor to produce sodium hydrosulfite bleach liquors.

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South Plainfield, NJ, United States of America

Jack A Tiethof