Methods for controlling scale formation in aqueous systems

Details Methods for controlling scale formation in aqueous systems Methods for controlling scale formation in aqueous systems

C - Chemistry, Metallurgy

02

F

C02F 5/10 (2006.01) C02F 5/12 (2006.01) C02F 5/14 (2006.01) C23F 11/10 (2006.01)

Patent

CA 2162313

A method of controlling scale formation and deposition and corro-sion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a scale/corrosion inhibitor in combination with a substituted alkylpolycarboxylate is employed. The scale/corrosion inhibitor can be a phosphonate such as hydroxyethylidene diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyphosphono-acetic acids, amino phosphonates; terpolymers, copolymers and homo-polymers of acrylic acid, maleic acid, epoxysuccinic acids such as poly-epoxysuccinic acid or mixtures thereof. The substituted alkylpolycarboxy-lates are compounds of the general structure: R-X-Y n wherein R is a hydrocarbon functionality having 4 to 18 carbons; X, when present, is --NH-, -NY1-, -N->O, -N-OC-Y1, -O- or -S-; n is greater than or equal to 1; and Y and Y1 each independently represent a substituted or non--substituted carboxylic acid functionality such that said alkylpolycarboxyl-ate has at least 2 carboxylic acid functional groups.

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