Methods and compositions to reduce azoles and AOX corrosion inhibitors
AssigneeBl Technologies, Inc.
InventorPaul Robert Frail
Life of this patent
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Abstract
A method to reduce or eliminate N-heterocycles, the method providing one or more environmentally benign chelators (EBCs) to an aqueous cooling system, the aqueous cooling system having at least one N-heterocycle in the presence of a halogenating or non-halogenating oxidizer. A method to reduce or eliminate AOX, the method providing one or more environmentally benign chelators (EBCs) to an aqueous cooling system, the aqueous cooling system having at least one AOX-containing species in the presence of a halogenating biocide.
Claims15
An inhibitor composition for providing corrosion protection to yellow metal surfaces in contact with an aqueous cooling system, the composition comprising:
- (i) a dispersant polymer;
- (ii) a biocide;
- (iii) a pH adjusting species;
- and
- (iv) an environmentally benign chelator, wherein the environmentally benign chelator comprises:
- (1) an amino polycarboxylic acid, wherein the amino polycarboxylic acid is selected from N-(2-Hydroxyethyl)ethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, Nitriloacetic acid, methylglycin diacetic acid, N,N-Dicarboxymethyl glutamic acid tetrasodium salt, (2R,3R,4S,5R,6R)-3,4,6-trihydroxy-5-sulfooxyoxane-2-carboxylic acid and Ethylenediamine-N,N′-disuccinic acid,
- (2) a buffer, or
- (3) a mixture of amino alkylene phosphonic acids and corresponding hydrolysis products,
- and
- wherein the composition does not contain an N-heterocycle.
A method for providing corrosion protection to yellow metal surfaces in contact with an aqueous cooling system, the method eliminates the use of N-heterocycles, the method comprises adding an inhibitor composition to the aqueous cooling system, wherein the inhibitor composition comprises:
- (i) a dispersant polymer;
- (ii) a biocide;
- (iii) a pH adjusting species;
- and
- (iv) an environmentally benign chelator, wherein the environmentally benign chelator comprises:
- (1) an amino polycarboxylic acid, wherein the amino polycarboxylic acid is selected from N-(2-Hydroxyethyl)ethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, Nitriloacetic acid, methylglycin diacetic acid, N,N-Dicarboxymethyl glutamic acid tetrasodium salt, (2R,3R,4S,5R,6R)-3,4,6-trihydroxy-5-sulfooxyoxane-2-carboxylic acid and Ethylenediamine-N,N′-disuccinic acid,
- (2) a buffer, or
- (3) a mixture of amino alkylene phosphonic acids and corresponding hydrolysis products, and
- wherein the composition does not contain an N-heterocycle.
An inhibitor composition for providing corrosion protection to yellow metal surfaces in contact with an aqueous cooling system, the composition comprising:
- (i) a dispersant polymer;
- (ii) a salt inhibitor;
- (iii) a biocide;
- (iv) a pH adjusting species;
- and
- (v) an environmentally benign chelator, wherein the environmentally benign chelator comprises:
- an amino polycarboxylic acid, a buffer, or a mixture of amino alkylene phosphonic acids and corresponding hydrolysis products, and
- wherein the composition does not contain an N-heterocycle.
Dependencies are inferred from the claim text.