KR920016358A - How to delay corrosion caused by dissolved oxygen on metal surfaces in contact with boiler water systems - Google Patents

Abstract

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Description

Method of delaying corrosion caused by dissolved oxygen on metal surface in contact with boiler water system

Since this is an open matter, no full text was included.

FIG. 1 shows a general overview of the boiler and the specific locations of the various boiler numbers that can be treated with the oxygen scavenger of the present invention. FIG. 2 shows an electrochemical cell, FIG. Comparing the polarization resistance of the oxygen scavenger to the treatment group.

Claims (11)

A process for removing oxygen from boiler water characterized by treating the boiler water with an effective amount of oxygen scavenging compound, or a mixture of compounds of the following general formula. Wherein R is independently at each occurrence (a) a lower straight and branched alkyl group having 1 to 4 carbons, and (b) COOM (where n is 1 to 3 and M is H, an alkali metal cation, amnonium or amino cation or mixtures thereof) and (c) a mixture of said alkyl group and carboxylated group. . The method of claim 1, wherein the R group has 1 to 3 carbon atoms. The method of claim 1, wherein the oxygen scavenger compound is selected from N, N, N ', N'tetramethyl-1,4-phenylenediamine and salts thereof, 1,4-phenylenediamine, N, N, N', N'tetraacetic acid and salts thereof, the method selected from the group consisting of mixtures thereof The process of claim 1 wherein the oxygen scavenger compound is N, N, N ', N'tetramethyl-1,4-phenylenediamine and salts thereof. The method of claim 1 wherein the oxygen scavenger compound is 1,4-phenylenediamine, N, N, N ', N'tetraacetic acid and salts thereof. (A) ammonium cation, (b) N (+) (H) x (R ') y, wherein R' is carbon number which may be linear or branched, An alkyl or alkoxyl group of from 20 to 20 and x and y both range from 0 to 4, provided the sum of x + y is 4) (c) Wherein R 'is independently selected at each occurrence hydrogen, a lower alkyl group having 1 to 4 carbon atoms, and mixtures thereof, (d) Where R 'is the same as above, z is 1 to 3, Is selected from a straight or branched chain alkylene group having 1 to 6 carbon atoms, an ethoxy group, a propoxyl group, and mixtures thereof) and (e) washing with an amine salt selected from the group consisting of mixtures thereof. How to remove oxygen from boiler water. Where n is 1 to 3 independently in each case. The acid salt of the oxygen scavenger compound of the general formula of the boiler water [here, the acid forming the acid salt is (a) an inorganic acid selected from hydroxamic acid, H ₂ PO ₄ , H ₂ SO ₄ , and mixtures thereof, b) an organic acid selected from formic acid, acetic acid, propionic acid, malic acid, maleic acid, citric acid, ethylene diamine tetraacetic acid, nitrilo triacetic acid, and mixtures thereof, and (c) a general formula containing one or more carboxylate functional groups [Where R 'is a methyl group, an ethyl group and COOM, where n is 1 to 3, except that one discrete of R COOM.] And a specific acid selected from the group consisting of a mixture of nitrogen compounds, and mixtures of (d), amino, and michi (e).]. Wherein R is independently at each occurrence selected from (C ₁ -C ₄ ) alkyl groups. The water-soluble carboxylate of any one of claims 1 to 6, wherein the boiler water also contains (1) a polymer having a molecular weight in the range of about 500 to about 50,000, (2) orthophosphate anion, source, (3) organophosphate Compound, (4) a complexing agent selected from EDTA and NTA, (5) bisulfite, erythorbic acid and salts thereof, ascorbic acid and salts thereof, EDHA, hydrazine, methyl ethyl ketoxime 1, 3 dihydroxy acetone, gallic acid, At least one compound selected from the group consisting of a hydroquinone, an unsubstituted diaminobenzene, a hydroxy diamino benzene, a chevohydrazide, or a mixture thereof, and an oxygen scavenger compound selected from the group consisting of, and a mixture of (6) Containing. 8. The boiler water according to claim 1, wherein the boiler water is from one or more of the group consisting of boiler feed water, internal boiler water, boiler cooling water, boiler air separator drop-leg water, or a specific mixture thereof. The method chosen. An oxygen scavenger compound formulation comprising a mixture of compounds of the general formula: Wherein R is independently at each occurrence (a) a lower (C ₁ -C ₄ ) alkyl group, (b) COOM where n is 1 to 3, M is H, Li, Na, Ka, NH ₄ , NH x R'Y, and mixtures thereof, where x is 1 to 4 and y is 1 to 4 and x + the sum of y is 4 and R 'is selected from lower alkyl groups (C ₁ -C ₄ ) and lower alkoxy groups (C ₂ -C ₃ ), and mixtures thereof), and (c) a group thereof Is selected from. The inorganic acid according to claim 10, which is present in a neutralized equivalent selected from the group consisting of phosphoric acid, sulfuric acid, hydroxamic acid and mixtures thereof, (b) formic acid, acetic acid, propionic acid, malic acid, maleic acid, ethylene diamine tetraacetic acid, A waterborne carboxylate containing an organic acid present in a neutralizing equivalent selected from the group consisting of nitrilotriacetic acid, citric acid, and mixtures thereof, (c) amino acids, (d) polymers having a molecular weight of 500 to 50,000, (e) phosphate compounds, (f) neutralizing amines, and (g) bisulfite, erythorbic acid and salts thereof, ascorbic acid and salts, DEHA, hydrazine, methyl ethyl ketoxime 1,3 dihydroxy acetone, gallic acid, hydroquinone, unsubstituted dia An oxygen scavenger compound selected from the group consisting of minobenzenes, hydroxy diaminobenzenes, carbohydrazides, or mixtures thereof and (h) mixtures thereof. And compositions that also contain one or more of the grouped groups. ※ Note: The disclosure is based on the initial application.