Dearborn Chemical Company Ltd.

John E Waller

Stewart N Paul

David W Kelly

Harvey W Thompson

David A Aston

John J Nemes

John A Gray

Iron oxide deposits are removed from substrates by use of aqueous solution at approximately neutral pH containing a phosphonate (e.g., hydroxyethylidene diphosphonic acid), a reducing agent (e.g., sodium sulfite), and a corrosion inhibitor (e.g., benzotriazole). Optionally, a surfactant and dispersant may be included.

Rust removal and composition thereof

Methods are described for flocculating and removing solids suspended in water using an inorganic component containing iron, aluminum, or a mixture thereof in combination with a tannin-based flocculant produced by reacting a condensed tannin with an amino compound and an aldehyde. The tannin-based flocculant is preferably the product of a controlled reaction in which the viscosity is monitored as an indication of suitable shelf life.

Method for flocculating and removing solids suspended in water

A composition and method are described for flocculating and removing solids suspended in water using an inorganic component containing iron, aluminum, or a mixture thereof in combination with a tannin-based flocculant produced by reacting a condensed tannin with an amino compound and an aldehyde. The tannin-based flocculant is preferably the product of a controlled reaction in which the viscosity is monitored as an indication of suitable shelf life.

Composition and method for flocculating and removing solids suspended in

A composition containing a hydroxylamine compound; a quinone, a dihydroxybenzene, a diaminobenzene, or an aminohydroxybenzene compound; and a neutralizing amine is an excellent oxygen scavenger and corrosion inhibitor in boiler water and other aqueous systems.

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Mississauga, Canada

John E Waller