Modified amine for boiler water treatment
View Patent ↗The present invention provides a method of treating boiler and condensate water by the addition of an effective amount of a hydroxyamine-acid ester treatment reagent or an all-in-one treatment composition comprising a hydroxyamine-acid ester. Modification of a hydroxyamine to a hydroxyamine-acid ester generally reduces the odors of the amine while providing a means to formulate the composition into a solid form. The ester typically decomposes at conditions in the boiler to release the hydroxyamine to treat the boiler water. Other components used to treat boiler water and condensate related problems may be formulated with the hydroxyamine-acid ester to form the all-in-one treatment composition.
1. A method of treating boiler water comprising the addition of a composition including:
an ester of a hydroxyamine and a phosphonic acid to water in said boiler water.
2. The method of claim 1 wherein said phosphonic acid has the general formula (OR) 2 —P(O)OH, wherein R independently is selected from the group consisting of H, alkyl, cycloalkyl, aryl, and heteroaryl organic structures having up to 10 atoms.
3. The method claimed in claim 1 wherein the ester is formed from:
a hydroxyamine having the general formula HO—(CR 1 R 2 ) n —N—R 3 R 4 wherein R 1 , R 2 , R 3 , and R 4 , at each occurrence, is independently selected from the group consisting of H, alkyl, cycloalkyl, aryl, and heteroaryl organic structures having up to 10 atoms,
and wherein R 3 and R 4 taken together with the nitrogen to which they are attached can form a 5 or 6 membered ring containing 0–2 additional heteroatoms selected from N or O,
and wherein R 1 or R 2 , independently, can be attached to R 3 or R 4 independently, to form a 5 or 6 membered ring containing 0–2 additional heteroatoms selected from N or O, and
n is an integer from 0–10; and
an acid selected from the group consisting of aminotri(methylene phosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, 1,2,4-tricarboxylic acid-butane-2-phosphonic acid and mixtures thereof.
4. The method claimed in claim 1 wherein the hydroxyamine is selected from the group consisting of hydroxy-modified cyclohexylamine, hydroxy-modified morpholine, hydroxy-modified octadecylamine, N, N-diethylethanolamine, 2-amino-2-methyl-1-propanol, 1,1-dimethylamine-propanol, 2-dimethylamino-2-methyl-1-propanol, hydroxy-modified N,N-dimethyl-1,3-propanediamine, and ammonium hydroxide.
5. The method claimed in claim 3 wherein the composition has a hydroxyamine to acid mole ratio in the range of from about 1:1 to about 3:1.
6. The method claimed in claim 1 further comprising an oxygen scavenging agent selected from the group consisting of sulfite and polyhydroxy acid,
wherein the polyhydroxy acid is selected from the group consisting of ascorbic acid and erythorbic acid.
7. The method claimed in claim 1 further comprising an alkalinity control agent selected from the group consisting of carbonate, hydroxide and amine.
8. The method claimed in claim 1 further comprising a hardness reducing agent selected from the group consisting of carbonate, polyacrylic acid, polymethacrylic acid, and salts thereof, and a polymaleate; and
a glucoheptonate.
9. The method claimed in claim 1 wherein the hydroxyamine is N, N-diethylethanolamine present in about 0.1% to about 50% by weight of the composition.
10. The method claimed in claim 1 wherein the ester is N,N-diethylaminoethanol-1-hydroxyethylene-1-phosphono-1-phosphonate ester present in about 0.1% to about 50% by weight of the composition.
11. The method claimed in claim 1 wherein the composition comprises by weight:
Glucoheptonate: 0% to 2.0%;
Sulfite: 0.1% to 60%;
Polyhydroxy acid: 0.1% to 5.0%;
said ester: 0.01% to 50%;
a polymer: 0.1% to 10%;
Polymaleate: 0.1% to 10%;
Carbonate: 0.0% to 20%;
alkali metal hydroxide: 0.0% to 40.0%, wherein
the sulfite is selected from the group consisting of sodium sulfite and potassium sulfite;
the polyhydroxy acid is selected from the group consisting of ascorbic acid and erythorbic acid;
wherein the hydroxyamine is selected from the group consisting of hydroxy-modified cyclohexylamine, hydroxy-modified morpholine, hydroxy-modified octadecylamine, N, N-diethylethanolamine, 2-amino-2-methyl-1-propanol, 1,1-dimethylamine-propanol, 2-dimethylamino-2-methyl-1-propanol, hydroxy-modified N,N-dimethyl-1,3-propanediamine, and ammomium hydroxide, and
the phosphonic acid is selected from the group consisting of aminotri(methylene phosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, and 1,2,4-tricarboxylic acid-butane-2-phosphonic acid, and wherein
the polymer is selected from the group consisting of polyacrylic acid, polymethacrylic acid, and salts thereof;
the polymaleate is polymaleic acid or the salt thereof; and
the carbonate is sodium carbonate or potassium carbonate.
12. The method claimed in claim 11 wherein the composition has a hydroxyamine to phosphonic acid mole ratio is in the range of from about 1:1 to about 3:1.
13. The method claimed in claim 11 wherein the ester is N,N-diethylaminoethanol-1-hydroxyethylene-1-phosphono-1-phosphonate ester present in about 0.1% to about 50% by weight of the composition.
14. The method claimed in claim 11 wherein the composition is a solid.
15. The method claimed in claim 1 wherein the composition comprises by weight:
Sodium Glucoheptonate: 0.01% to 5.0%;
Sodium sulfite: 1.0% to 30%;
Ascorbic acid: 0.1% to 5.0%;
Sodium polymethacrylate having a molecular weight between 500–5000: 1.0% to 10%;
N,N-diethylaminoethanol-1-hydroxyethylene-1-phosphono-1-phosphonate ester: 0.1% to 22.5%;
Maleic acid having a molecular weight between 500–1000: 0.1% to 5.0%;
Sodium carbonate: 0% to 20%;
Sodium hydroxide: 0% to 40%; and
Water: to 100%.