Calgon Corporation

Nalco Chemical Company

Robert J Guerrini

Denis E Hassick

Paul A Rey

Pamela J Dotter

Michael P Flaherty

A coagulant which is the reaction product of a trivalent metal salt, excluding chromium salts, an acid phosphorous compound and an aluminum hydroxy chloride, and a process for preparing such coagulant. This coagulant may be effectively used to remove suspended solids and various impurities in most water treatment applications.

Inorganic composition, process of preparation and method of use

A coagulant which is the reaction product of a trivalent metal salt (eg., FeCl,), excluding chromium salts, an acid phosphorous compound and an aluminum hydroxy chloride, and a process for preparing such coagulant. This coagulant may be effectively used to remove suspended solids and various impurities in most water treatment applications.

A stable blended product comprising a melamine aldehyde, urea aldehyde or melamine-urea aldehyde and colloidal silica is useful as a detackifier for solvent-borne paints and other resinous materials. This product is also useful as a conditioning agent prior to collection of water-borne paints, a treatment for water containing oils or greases, a color-remover in natural waters, and for enhanced removal of suspended solids.

Composition useful for treating suspended solids and color bodies in

Methods of treating circulating water containing over-sprayed, water-borne paint, alone or in combination with over-sprayed solvent-borne paint, as in a paint spray booth operation, comprise maintaining the alkalinity of the paint spray booth water between about 50 and 2000 ppm, on a calcium carbonate basis, by adding an alkalinity source thereto, maintaining the pH between about 6.0 and 9.0, adding a melamine polymer to the water, adding an aluminum salt to the water, contacting the over-sprayed paints with the alkalinity-adjusted paint spray booth water before or after addition of the melamine polymer and aluminum salt, adding an effective amount of a flocculant to the paint spray booth water, and removing resulting sludge from the paint spray booth water.

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Aliquippa, PA, United States of America

Robert J Guerrini