W. R. Grace Co.-conn.

Dearborn Chemicals, Ltd.

W. R. Grace Co.

Betzdearborn, Inc.

Brian Greaves

Chih M Hwa

Paul Ingham

Joseph C Fan

John A Kelly

Robert P Kreh

Lai-Duien Grace Fan

Wun T Tai

John J Bennison

Stuart W Longworth

Stephen C Poole

Stephen Clifford Poole

Stuart J Grenside

A method of treating an aqueous system is described which comprises incorporating in the system a hydroxylamine derivative of the general formula: ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 which may be the same or different represents hydrogen, alkyl of 1 to 8 carbon atoms or aryl or a water soluble salt thereof or a precursor thereof, and a tannin in a weight ratio of at least 2:1. This is particularly useful for boiler water systems.

Method for inhibition of oxygen corrosion in aqueous systems by the use

A method of comprising iron in an aqueous system comprising adding to the system a copolymer of styrene sulfonic acid and methacrylic acid or its water soluble salt in an amount effective to disperse the iron contained therein.

Method of dispersing iron

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 for the treatment of an aqueous system, typically hard water in a cooling system, is described which comprises adding thereto:

Method for controlling scale

A composition suitable for addition to an aqueous system which comprises a mixture of the following three components

Scale control admixtures

A method of treating an aqueous system is disclosed which comprises adding thereto a water-soluble zinc salt, a chelant and either a product containing at least one phosphorous-containing acid group and at least one carboxylic acid group or an acrylic, vinyl or allyl carboxylic acid polymer.

Treatment of aqueous systems

A method for inhibiting corrosion in an aqueous system, for example a cooling system, is disclosed which comprises adding to the system a phosphonate of the formula: ##STR1## where R.sub.1 represents hydrogen or an alkyl radical of 1 to 6 carbon atoms and R.sub.2 represents hydrogen, hydroxyl or amino, or a salt thereof and a cationic polymer.

Corrosion control in aqueous systems using cationic polymers in

A method for inhibiting corrosion in an aqueous system is described which comprises adding to the system a corrosion inhibiting metal salt capable of forming a passivating film of a water insoluble salt of said metal at the cathode, and a substantially linear cationic polymer.

Method of inhibiting corrosion in aqueous systems

A method for inhibiting corrosion in an aqueous system which comprises adding to the system a corrosion inhibiting salt capable of forming a passivating film at the anode, and a substantially linear cationic polymer, is especially useful in cooling water systems and their associated equipment.

Method of dispersing particulate matter, e.g., sludge, in water comprising adding thereto a copolymer, preferably methacrylic acid and acrylamide in a 1:1 mole ratio.

Process for dispersing particulate material in aqueous systems

Sludge is dispersed in cooling water systems by means of a combination of 2-phosphonobutane-1,2,4-tricarboxylic acid and a water soluble organic polymer possessing carboxylic and sulfonate groups.

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Runcorn, United Kingdom

Brian Greaves