Calgon Corporation

The State University of New York

Jasbir S Gill

Richard G Varsanik

Susan P Rey

Jennifer R Parsons

Kenneth F Henderson

John H Wiernik

Monica A Yorke

Nancy S Sherwood

David L Elliott

Rodney M Donlan

Christopher L Wiatr

Charles J Schell

Arthur J Friedman

Ann M Cognetti

Peter R Ten Eyck

John P Pilsits, Jr

George H Nancollas

Disclosed in the present application is a composition that is useful for rust and/or corrosion removal that contains a reducing agent, a chelating agent, a surfactant, and a dispersant. Disclosed also are processes for using this composition in aqueous systems and metal surface treatment.

Rust and scale removal composition and process

A method for reducing formation of deposits on a surface in contact with an aqueous system includes applying to the surface a composition comprising a polyoxypropylene-polyoxyethylene block copolymer and a biocide. The composition optionally may also include a dispersant.

Methods for reducing deposit formation on surfaces

A method of use of a composition including either or both isomers of hydrogenated methylbenzotriazole, namely, 5-Methyl-1H-Benzotriazole or 4-Methyl-1H-Benzotriazole which have been at least about 50% hydrogenated, to form corrosion inhibiting films on metal surfaces in an aqueous environment. The hydrogenated methylbenzotriazole compositions provide both improved passivation and improved film persistence when charged to aqueous industrial systems either on a continuous or on an intermittent basis. Continuous dosing is generally kept at a constant &gt;0.5, typically 1-2 ppm in the aqueous system to be treated; intermittent doses are generally 10-20 ppm once every week or two or more. Beyond the improved characteristics described above, films formed from the inventive composition also reduce spiking in corrosion rates immediately following halogen addition; foster faster return to pre-halogenation corrosion rates post-halogenation; and reduce the rate of conversion of phosphonate to orthophosphate, which reduces scale potential. For these reasons, the present compositions are either continuously or intermittently fed and effective to inhibit corrosion of copper and copper alloy surfaces subjected to alkaline, neutral or slightly acidic aqueous systems.

Method of forming corrosion inhibiting films with hydrogenated

An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenoxymethallyl ether and maleic acid, (C) a hydroxyphosphonoacetic acid, and (D) a phosphonocarboxylic acid copolymer comprising the monomers of acrylic acid, telomer with (1-hydroxy-1-methylethyl) phosphinic acid monosodium salt, and 2-acrylamido 2 methylpropane sulfonic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.

Aqueous system containing a synergistic combination for scale control

An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenomethallyl ether and maleic acid, and (C) a hydroxyphosphonoacetic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.

Aqueous system containing a synergistic phosphonate scale control

A method for inhibiting the formation, deposition and adherence of scale forming salts including calcium carbonate and calcium phosphate in an aqueous system having a pH of at least 8.5 and a calcite saturation level of at least 100 times the solubility limit of calcium as calcite, including adding to the aqueous system a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenoxymethallyl ether and maleic acid, (C) a hydroxyphosphonoacetic acid, and (D) a phosphonocarboxylic acid copolymer.

Method for controlling scale in an aqueous system using a synergistic

An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, and (B) a terpolymer comprising the monomers of acrylic acid, sulfophenomethallyl ether and maleic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.

Aqueous system containing a synergistic combination including polyether

Method for controlling scale using a synergistic phosphonate combination

Controlling calcium carbonate and calcium phosphate scale in an aqueous

An anionic/cationic polymer mixture comprising:

Controlling scale in black liquor evaporators

Polyether polyamino methylene phosphonates, when added to various industrial water systems in concentrations between 0.1 mg/L and 50 mg/L, control silica/silicate deposition. In particular, this stabilization can be achieved under severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate.

Controlling silica/silicate deposition using polyether polyamino

Polyether polyamino methylene phosphonates, when added to various industrial water systems in concentrations between 0.1 mg/L and 50 mg/L, stabilize soluble zinc, manganese and iron ions and their reaction products, in desirable forms and reduced particle sizes. In particular, this stabilization can be achieved under severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate.

Zinc, iron and manganese stabilization using polyether polyamino

Composition for controlling scale in black liquor evaporators

A method for controlling the formation of silica/silicate deposits in aqueous systems by adding an effective amount, preferably at least 0.1 ppm, of 2-phosphonobutane tricarboxylic acid-1,2,4 and, optionally, an anionic polymer, preferably a carboxylic/sulfonic polymer, or salts thereof to the aqueous system being treated. Borate or molybdate ion sources may also be added.

Method for controlling silica/silicate deposition in aqueous systems

This invention relates to the use of traditional scale inhibitors as fertilizers enhancers. More particularly, this invention relates to compositions which comprise: (a) a phosphate fertilizer and (b) a scale inhibiting compound. Further, this invention relates to a method of stimulating and increasing plant growth, and corresponding yields, comprising adding the above-defined compositions to the soil in which the plants being treated grow.

Growing community of inventors

McKees Rocks, PA, United States of America

Jasbir S Gill