US 4,096,090 AGrant
Catalyzed Hydrazine Compositions and Methods of Their Use
Issue Date:1978-06-20
•26 Claims
Abstract
Corrosion inhibiting compositions are described which contain a hydrazine compound, an organometallic complex and preferably a quinone compound. The organometallic complex is the reaction product of a cobaltous or manganous hydroxide and one or more aromatic ligands containing at least two hydroxy functional groups, or at least one amino and one hydroxy group, in the ortho position with respect to one another. The quinone compound is preferably added to these compositions in order to render the compositions compatible with chelating phosphonate scale control agents. The use of these compositions as oxygen scavengers in corrosive environments is also described.
Metadata
Assignee
- Olin Corporation
Inventor
- Manfred G. Noack
Application Information
Application Number:US 7631952
Filing Date:1977-01-27
Priority Date:1975-08-21
Art Unit:223
Classifications
IPC:
C23F 1118C23F 1114
Field of Search:
25221106389 R;390;400 R2.7 R;2.5 R14
Patent Drawings
This patent does not have any drawings.
Description
EXAMPLE 1
Composition with Co/1,2-Dihydroxybenzene Catalyst
400 mg 1,2-dihydroxybenzene and 70 ml distilled water are added to 88 ml of hydrazine hydrate in a nitrogen-blanketed stirred flask. A weighed quantity of 172 mg cobaltous hydroxide hydrate is subsequently transferred quantitatively to the flask from a tared container by rinsing with 1 ml of distilled water. Complete dissolution of the cobaltous hydroxide is achieved after stirring for several minutes. No anionic impurities are present in the resulting composition.
EXAMPLE 2
Composition with Mn/1,2-Dihydroxybenzene Catalyst
The procedure of Example 1 was followed except that 0.164 g Mn(OH).sub.2 were added to the aqueous solution containing the hydrazine and the 1,2-dihydroxybenzene. The resulting composition, a clear colorless solution, contained no anionic impurities from the use of manganous salt.
EXAMPLE 3
Composition with Mn/o-Aminophenol Catalyst
Quantities of approximately 200 mg o-aminophenol, 35 ml distilled water and 44 ml hydrazine hydrate are combined in a nitrogen-blanketed stirred flask. Subsequently, one adds approximately 86 mg manganous hydroxide and obtains a somewhat cloudy solution of catalyzed hydrazine corrosion-inhibiting composition.
EXAMPLE 4
Composition with Co/Dihydroxybenzene/Toluhydroquinone Catalyst
498 mg toluhydroquinone are dissolved in approximately 160 ml of the solution prepared in accordance with Example 1 to obtain a corrosion-inhibiting hydrazine solution.
EXAMPLE 5
Composition with Mn/Dihydroxybenzene/Toluhydroquinone Catalyst
A quantity of 498 mg toluhydroquinone (synonym methyl-hydroquinone) was added to a solution prepared in accordance with Example 2.
EXAMPLE 6
Composition with Mn/o-Aminophenol/Toluhydroquinone Catalyst
The preparation of solution in accordance with Example 3 was repeated except that approximately 250 mg toluhydroquinone were added.
EXAMPLE 7
Measurement of Rate of Oxygen Removal
To measure rates of oxygen removal, one places approximately 1060 ml of a solution containing approximately 7 ppm dissolved O.sub.2 and sodium bicarbonate and carbonate (to give a pH of 10) in a stirred Erlenmeyer flask. The flask is fitted with a selective membrane electrode for measurement of dissolved oxygen concentration. A hydrazine solution without catalyst, and the catalyzed hydrazine solutions in accordance with Examples 1 through 6 are then injected in each test in sufficient quantity to bring N.sub.2 H.sub.4 concentration before reaction with oxygen occurs to 150 ppm. The subsequent decrease in oxygen concentration is recorded as a function of time.
An examination of times required for oxygen removal as summarized in Table I demonstrates the accelerating effect of the catalyst prepared in accordance with this invention.
Claims
What is claimed is:
1. A composition comprising: (a) a hydrazine compound; and (b) from about 0.0005 parts to about 0.1 parts by weight of an organometallic complex per part of hydrazine compound, said organometallic complex being the reaction product of: (i) a hydroxide selected from the group consisting of cobaltous hydroxide and manganous hydroxide; and (ii) one or more organic ligands selected from the group consisting of unsubstituted and substituted ortho-dihydroxy aromatic compounds and unsubstituted and substituted ortho-aminohydroxy aromatic compounds.
2. The composition of claim 1 wherein said hydroxide is cobaltous hydroxide.
3. The composition of claim 1 wherein said hydrazine compound is hydrazine.
4. The composition of claim 1 wherein said ligand is an unsubstituted ortho-dihydroxy aromatic compound.
5. The composition of claim 1 which includes at least about 0.0005 parts by weight of a quinone compound per part of hydrazine compound.
6. The composition of claim 5 wherein said hydrazine compound is hydrazine, said organometallic complex is the reaction product of cobaltous hydroxide and an unsubstituted ortho-dihydroxy aromatic compound and said quinone compound is a para-quinone, a para-hydroquinone, a para-naphthoquinone, a para-anthraquinone, a para-hydronaphthoquinone, a para-hydroanthraquinone, or a substituted derivative thereof.
7. The composition of claim 6 wherein said ortho-dihydroxy aromatic compound is 1,2-dihydroxybenzene.
8. The composition of claim 7 wherein said quinone compound is methylhydroquinone.
9. The composition of claim 8 wherein about 0.005 parts to about 0.02 parts by weight of the organometallic complex is used per part of hydrazine compound.
10. The composition of claim 9 wherein about 0.005 parts to about 0.02 parts by weight of said quinone compound is used per part of hydrazine compound.
11. The composition of claim 1 wherein about 0.002 parts to about 0.1 parts by weight of the organometallic complex is used per part of hydrazine compound.
12. The composition of claim 1 which includes about 0.001 parts to about 0.1 parts by weight of a quinone compound per part of hydrazine compound.
13. The composition of claim 1 wherein said hydrazine compound is in an aqueous solution containing about 5 to about 64 percent hydrazine by weight, based on the total weight of the water and the hydrazine compound.
14. A method of treating a fluidic corrosive environment to remove oxygen therefrom and inhibit corrosion therein, which comprises: treating said environment with a composition comprising: (a) a hydrazine compound; and (b) from about 0.0005 parts to about 0.1 parts by weight of an organometallic complex per part of hydrazine compound, said organometallic complex being the reaction product of: (i) a hydroxide selected from the group consisting of cobaltous hydroxide and manganous hydroxide; and (ii) one or more organic ligands selected from the group consisting of unsubstituted and substituted ortho-dihydroxy aromatic compounds and unsubstituted and substituted ortho-aminohydroxy aromatic compounds.
15. The method of claim 14 wherein said hydroxide is cobaltous hydroxide.
16. The method of claim 14 wherein said hydrazine compound is hydrazine.
17. The method of claim 14 wherein said ligand is an unsubstituted ortho-dihydroxy aromatic compound.
18. The method of claim 14 which includes at least about 0.0005 parts by weight of a quinone compound per part of hydrazine compound.
19. The method of claim 18 wherein said hydrazine compound is hydrazine, said organometallic complex is the reaction product of cobaltous hydroxide and an unsubstituted ortho-dihydroxy aromatic compound and said quinone compound is a para-quinone, a para-hydrouinone, a para-naphthoquinone, a para-anthraquinone, a para-hydronaphthoquinone, a para-hydroanthraquinone, or a substituted derivative thereof.
20. The method of claim 19 wherein said ortho-dihydroxy aromatic compound is 1,2-dihydroxybenzene.
21. The method of claim 20 wherein said quinone compound is methylhydroquinone.
22. The method of claim 21 wherein about 0.005 parts to about 0.02 parts by weight of the organometallic complex is used per part of hydrazine compound.
23. The method of claim 22 wherein about 0.005 parts to about 0.02 parts by weight of said quinone compound is used per part of hydrazine compound.
24. The method of claim 14 wherein about 0.002 parts to about 0.1 parts by weight of the organometallic complex is used per part of hydrazine compound.
25. The method of claim 14 which includes about 0.001 parts to about 0.1 parts by weight of a quinone compound per part of hydrazine compound.
26. The method of claim 14 wherein said hydrazine compound is in an aqueous solution containing about 5 to about 64 percent hydrazine by weight, based on the total weight of the water and the hydrazine compound.
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