Azole derivatives for corrosion mitigation

Patent metadata

Field	Value
Publication number	US-10640473-B2
Application number	US-201715663270-A
Country	US
Kind code	B2
Filing date	Jul 28, 2017
Priority date	Jul 29, 2016
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

Anticorrosion compounds and compositions can be used in methods for preventing metal corrosion. More specifically, the method comprises contacting an anticorrosion composition to an aqueous system in contact with a metal. The anticorrosion composition comprises substituted and/or hydrogenated benzotriazoles and tolyltriazoles.

First claim

What is claimed is:

1. A method for preventing metal corrosion, the method comprising contacting an effective amount of an anticorrosion composition with an aqueous system in contact with a metal, the anticorrosion composition comprising an alkyl benzotriazole, an alkyl tolyltriazole, an alkoxy benzotriazole, an alkoxy tolyltriazole, a nitro benzotriazole, a nitro tolyltriazole, a halo benzotriazole, a halo tolyltriazole, a hydrogenated benzotriazole, a hydrogenated tolyltriazole, an acid or a salt thereof, or a combination thereof; wherein the aqueous system comprises a brine and has a pH less than 3 and the alkyl benzotriazole is butyl benzotriazole, pentyl benzotriazole, hexyl benzotriazole, heptyl benzotriazole, octyl benzotriazole, or a combination thereof.

2. The method of claim 1 , wherein the anticorrosion composition does not contain phosphorous.

3. The method of claim 1 , wherein the alkyl tolyltriazole is butyl tolyltriazole, pentyl tolyltriazole, hexyl tolyltriazole, heptyl tolyltriazole, octyl tolyltriazole, or a combination thereof; the alkoxy benzotriazole is butoxy benzotriazole, pentoxy benzotriazole, hexoxy benzotriazole, heptoxy benzotriazole, octoxy benzotriazole, or a combination thereof; the nitro benzotriazole is 3-nitrobenzotriazole, 4-nitrobenzotriazole, 5-nitrobenzotriazole, 6-nitrobenzotriazole, or a combination thereof; and the halo benzotriazole is a fluoro benzotriazole, a chloro benzotriazole, a bromo benzotriazole, an iodo benzotriazole, or a combination thereof.

4. The method of claim 1 , wherein the alkyl tolyltriazole has from 1 to 5 alkyl substituents attached to a nitrogen atom of the azole or to a carbon atom of the aromatic ring and the alkyl substituents are C 1 to C 12 alkyl groups.

5. The method of claim 1 , wherein the alkoxy benzotriazole has from 1 to 6 alkyl substituents attached to a nitrogen atoms of the azole or to a carbon atom of the aromatic ring and the alkyl substituents are C 1 to C 12 alkyl groups.

6. The method of claim 1 , wherein the nitro benzotriazole has the nitro group attached to one or more carbon atoms of the aromatic ring and has a substituent of alkyl, alkoxy, or halo attached to a nitrogen atom of the azole or to a carbon atom of the aromatic ring.

7. The method of claim 1 , wherein the halo benzotriazole has the halo group attached to one or more carbon atoms of the aromatic ring and has a substituent of alkyl or alkoxy attached to a nitrogen atom of the azole or a substituent of alkyl, alkoxy, or nitro attached to a carbon atom of the aromatic ring.

8. The method of claim 7 , wherein the halo benzotriazole is 3-halo benzotriazole, 4-halo benzotriazole, 5-halo benzotriazole, 6-halo benzotriazole, or a combination thereof.

9. The method of claim 1 , wherein the hydrogenated benzotriazole has one or more additional hydrogen atoms added across one or more of the double bonds of the benzotriazole and the hydrogenated tolyltriazole has one or more additional hydrogen atoms added across one or more of the double bonds of the tolyltriazole.

10. The method of claim 1 , wherein the aqueous system has a conductivity of from about 2,000 to about 100,000 micromho/cm.

11. A method for preventing metal corrosion, the method comprising contacting an effective amount of an anticorrosion composition with an aqueous system in contact with a metal, the anticorrosion composition comprising an alkyl benzotriazole, an alkyl tolyltriazole, an alkoxy benzotriazole, an alkoxy tolyltriazole, a nitro benzotriazole, a nitro tolyltriazole, a halo benzotriazole, a halo tolyltriazole, a hydrogenated benzotriazole, a hydrogenated tolyltriazole, an acid or a salt thereof, or a combination thereof; wherein the aqueous system comprises a brine and has a pH less than 3 and is further contacted with a salt of a nitrogen base having a fluoro inorganic anion.

12. The method of claim 11 , wherein the aqueous system has a pH of less than 2.

13. The method of claim 11 , wherein the aqueous system has a temperature of from about 80° C. to about 400° C.

14. The method of claim 13 , wherein the aqueous system has a temperature of from about 120° C. to about 300° C.

15. The method of claim 11 , wherein the nitrogen base is urea, biuret, an alkyl urea, an alkanolamine, an alkylamine, a dialkylamine, a trialkylamine, an alkyldiamine, an alkyltriamine, an alkyltetramine, a polyamine, an acrylamide, a polyacrylamide, a vinyl pyrolidone, a polyvinyl pyrolidone, or a combination thereof.

16. The method of claim 11 , wherein the fluoro inorganic anion comprises tetrafluoroborate and the nitrogen base comprises urea and the molar ratio of urea to tetrafluroboric acid used to prepare the salt is 1:3 to 3:1.

17. The method of claim 1 , wherein the metal comprises carbon steel.

18. The method of claim 1 , wherein the metal is contained within a piece of equipment and the piece of equipment is a boiler, a steam generator, an evaporator, a heat exchanger, a cooling coil, a chiller, a tube bundle, a tank, a sump, a containment vessel, a pump, a distributor plate, a geothermal system, a production well, an injection well, a steam separator, a binary geothermal unit, a transfer pipe, an oil well, or a deep injection well.

19. The method of claim 11 , wherein the metal comprises carbon steel.

20. The method of claim 11 , wherein the metal is contained within a piece of equipment and the piece of equipment is a boiler, a steam generator, an evaporator, a heat exchanger, a cooling coil, a chiller, a tube bundle, a tank, a sump, a containment vessel, a pump, a distributor plate, a geothermal system, a production well, an injection well, a steam separator, a binary geothermal unit, a transfer pipe, an oil well, or a deep injection well.

Assignees

• Ecolab Usa Inc

Inventors

• Gill Jasbir S
• Moghadam Shayan
• Miller Thomas M

Classifications

• C08F26/10

  N-Vinyl-pyrrolidone · CPC title

• C01B35/063

  Tetrafluoboric acid; Salts thereof · CPC title

• C23F11/10

  using organic inhibitors · CPC title

• C07D249/18 Primary

  Benzotriazoles · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title