Oxyalkylated surfactants as corrosion inhibitors

Patent metadata

Field	Value
Publication number	US-12018388-B2
Application number	US-202117337859-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Jun 3, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

Disclosed are oxyalkylated surfactants used in compositions and methods for inhibiting corrosion.

First claim

What is claimed is:

1. A method of inhibiting corrosion comprising:
introducing into a fluid source containing corrodents a composition comprising an oxyalkylated surfactant having the general structure as shown in Formula I:

wherein A is a phenyl or naphthyl ring, optionally substituted thereof; and Z has the following structure:

wherein X is —O—; p is 0 or an integer in the range of 1 to 10; R6 is hydrogen, alkyl, or aryl; R7 is an alkyl group having eight to thirty carbon atoms or —(CH 2 ) z —O—R11; R8 and R9 are independently hydrogen, alkyl, or aryl, wherein at least one of R8 and R9 are other than hydrogen, and wherein R8 and R9 are different; R11 is independently hydrogen or alkyl; m is an integer in the range of 2 to 20; n is an integer in the range of 3 to 20; and z is an integer in the range of 1 to 10, and wherein the composition inhibits corrosion.

2. The method of claim 1 , wherein introducing comprises injecting or pumping.

3. The method of claim 1 , wherein the fluid source is contained in an oil or gas pipeline, a refinery, a distillation column, a stripper tray, or piping.

4. The method of claim 1 , wherein the fluid source comprises fresh water, recycled water, salt water, surface water, produced water, a liquid hydrocarbon, or a mixture thereof.

5. The method of claim 1 , wherein the fluid source comprises an amount of total dissolved solids in the range of about 0.1% to about 25% weight/weight.

6. The method of claim 1 , wherein A is a phenyl ring, optionally substituted thereof.

7. The method of claim 1 , wherein the oxyalkylated surfactant has a structure of Formula II:

wherein R1, R2, R3, R4, and R5 are independently hydrogen, Z, unsubstituted alkyl, alkoxyl, or two adjacent R groups combine to form a fused naphthyl ring.

8. The method of claim 1 , wherein the oxyalkylated surfactant has a structure corresponding to Formula III:

wherein n is an integer in the range of 10 to 20 and m is an integer in the range of 2 to 12.

9. The method of claim 1 , wherein the oxyalkylated surfactant is added to the fluid source in an amount in the range of 1 ppm to 3,000 ppm.

10. The method of claim 1 , wherein the composition further comprises an asphaltene inhibitor, a paraffin inhibitor, a scale inhibitor, a demulsifier, a water clarifier, a dispersant, an emulsion breaker, an antifoam, a salt, or a mixture thereof.

11. The method of claim 1 , wherein the oxyalkylated surfactant provides at least 50% corrosion protection in a 1018 carbon steel coupon test.

12. The method of claim 1 , wherein R9 is —H and R8 is alkyl or aryl.

13. The method of claim 1 , wherein R9 is —H and R8 is methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, i-pentyl, s-pentyl, t-pentyl, or benzyl.

14. The method of claim 1 , n is greater than m.

15. The method of claim 14 , wherein n is an integer in the range of 10 to 20 and m is an integer in the range of 2 to 12.

16. The method of claim 15 , wherein n is an integer in the range of 16 to 18 and m is an integer in the range of 4 to 8.

17. The method of claim 1 , wherein R7 is —(CH2)z—O—R11.

18. A method of inhibiting corrosion comprising:
introducing into a fluid source containing corrodents a composition comprising an oxyalkylated surfactant having the general structure as shown in Formula I:

wherein A is a phenyl or naphthyl ring, optionally substituted thereof; and Z has the following structure:

wherein X is —O—; p is 0 or an integer in the range of 1 to 10; R6 is hydrogen, alkyl, or aryl; R7 is an alkyl group having eight to thirty carbon atoms or —(CH2)z-O—R11,” wherein R11 is independently hydrogen or C4-C22 alkyl; R8 and R9 are independently hydrogen, alkyl, or aryl, wherein at least one of R8 and R9 are other than hydrogen; m is an integer in the range of 2 to 20; n is an integer in the range of 3 to 20; and z is an integer in the range of 1 to 10; and wherein the composition inhibits corrosion.

Assignees

• Ecolab Usa Inc

Inventors

• Dhawan Ashish
• Moloney Jeremy
• Silvernail Carter M

Classifications

• C23F11/173

  Macromolecular compounds · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C23F11/141

  Amines; Quaternary ammonium compounds · CPC title

• C23F11/12 Primary

  Oxygen-containing compounds · CPC title

• C02F2305/04

  Surfactants, used as part of a formulation or alone · CPC title