Corrosion control methods for corrosion-agressive solutions
US-10214459-B2 · Feb 26, 2019 · US
Corrosion control using organic filmers and passivators in systems for processing nitrogen-containing solutions
US11746294B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11746294-B2 |
| Application number | US-202117334351-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 28, 2021 |
| Priority date | May 28, 2021 |
| Publication date | Sep 5, 2023 |
| Grant date | Sep 5, 2023 |
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Abstract
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Methods and compositions for inhibiting corrosion of a corrodible metal surface that contact a nitrogen-containing solution. The method comprises adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator. The organic filmer may be a hydroxycarboxylic acid. The chemical treatment composition may further include a surface-active compound.
First claim
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What is claimed is: 1. A method of inhibiting corrosion of a corrodible metal surface that contacts a nitrogen-containing solution including elemental nitrogen in a range of 28 to 34% by wt %, the method comprising: adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator, wherein the organic filmer includes a hydroxycarboxylic acid selected from the group consisting of tartaric acid and glycolic acid, and the treatment composition is provided in a sufficient amount and for a sufficient time to form a stable protective film on at least a portion of the corrodible metal surface. 2. The method of inhibiting corrosion according to claim 1 , wherein the passivator is an organophosphorus compound or phosphorous molybdate. 3. The method of inhibiting corrosion according to claim 1 , wherein the chemical treatment composition further includes a surface-active compound. 4. The method of inhibiting corrosion according to claim 3 , wherein the surface-active compound is a nonionic surfactant. 5. The method of inhibiting corrosion according to claim 4 , wherein the nonionic surfactant is an ester. 6. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a concentration of the organic filmer in the nitrogen-containing solution is in a range of 1 ppm to 90 ppm. 7. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a concentration of the organic filmer in the nitrogen-containing solution is in a range of 25 ppm to 50 ppm. 8. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a concentration of the passivator in the nitrogen-containing solution is in a range of 1 ppm to 90 ppm. 9. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a concentration of the passivator in the nitrogen-containing solution is in a range of 25 ppm to 50 ppm. 10. The method of inhibiting corrosion according to claim 3 , wherein the treatment composition is added so that a concentration of the surface-active compound in the nitrogen-containing solution is in a range of 1 ppm to 90 ppm. 11. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a concentration of the surface-active compound in the nitrogen-containing solution is in a range of 25 ppm to 50 ppm. 12. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is added so that a combined concentration of the organic filmer and the passivator in the nitrogen-containing solution is in a range of 50 to 150 ppm. 13. The method of inhibiting corrosion according to claim 1 , wherein a ratio of a concentration of the organic filmer in the nitrogen-containing solution in terms of ppm to a concentration of the passivator in the nitrogen-containing solution in terms of ppm is in a range of 1:10 to 10:1.
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Classifications
using organic inhibitors · CPC title
Phosphorus-containing compounds · CPC title
Refractory metal-containing compounds · CPC title
- C09K15/06Primary
containing oxygen · CPC title
containing inorganic compounds · CPC title
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- What does patent US11746294B2 cover?
- Methods and compositions for inhibiting corrosion of a corrodible metal surface that contact a nitrogen-containing solution. The method comprises adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator. The organic filmer may be a hydroxycarboxylic acid. The chemical treatment composition may further include a surface-active c…
- Who is the assignee on this patent?
- Chemtreat Inc
- What technology area does this patent fall under?
- Primary CPC classification C09K15/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 05 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).