W. R. Grace Co.-conn.

Dearborn Chemicals, Ltd.

John J Bennison

Stuart W Longworth

Brian Greaves

Richard P Clifford

John G Baker

Philip Brocklebank

A method for treating an aqueous system is disclosed which comprises incorporating therein a water soluble organic sulphonate copolymer and an optionally N-substituted water soluble copolymer of acrylamide or methacrylamide and a copolymerizable monomer.

Inhibition of deposition in aqueous systems

A method of controlling pitch in an aqueous system involved in paper making as described which comprises adding a cationically modified tannin to the system.

Method of controlling pitch using a cationically modified tannin

A method of inhibiting and preventing scale in an aqueous system is described which comprises incorporating in the water at least one amino carboxylate having the formula:

Treatment of aqueous systems

Composition and method for inhibiting corrosion in aqueous systems using synergistic combination of an inorganic nitrite and a phosphonate, e.g., 10-20 ppm sodium nitrite plus 0.5-5 ppm hydroxyethylidene diphosphonic acid.

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Runcorn, United Kingdom

John J Bennison