MONO AND BIS-ESTER DERIVATIVES OF PYRIDINIUM AND QUINOLINIUM COMPOUNDS AS ENVIRONMENTALLY FRIENDLY CORROSION INHIBITORS

• US 20080308770A1
• Filed: 06/14/2007
• Published: 12/18/2008
• Est. Priority Date: 06/14/2007
• Status: Abandoned Application

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Tiwari, Laxmikant
• Application Number:
  US11/763,006
• Publication Number:
  US 20080308770A1
• Time in Patent Office: Days
• US Class Current: 252/394
• CPC Class Codes: C07D 213/04 having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
• CPC Class Codes: C07D 215/10 Quaternary compounds
• CPC Class Codes: C23F 11/149 Heterocyclic compounds containing nitrogen as hetero atom

Abstract

A quaternary nitrogen-containing corrosion inhibitor of formula

wherein

is an aromatic, nitrogen-containing ring of 5 to 14 ring atoms, optionally containing an additional N, O or S ring atom and optionally substituted with one or more alkyl, alkenyl, aryl, arylalkyl, cycloalkyl, amino, aminoalkyl, alkoxy, hydroxylalkyl, or cyano groups, or a mixture thereof, Y is a group of formula —OC(O)R₁ or —C(O)R₁; L is C₁-C₁₀ alkyl, C₂-C₁₀ alkenyl or a group of formula CH₂CH(OR₂)CH₂—; R₁ is C₈-C₂₀ alkyl or C₈-C₂₀ alkenyl; R₂ is H or C(O)R₁; R₃ and R⁴ are independently selected from H, alkyl, alkenyl, amino, alkoxy, hydroxylalkyl and cyano; and X is Br, Cl or I is particularly useful for inhibiting corrosion in oil and gas field applications.

Claims

1. A quaternary nitrogen-containing corrosion inhibitor of formula

2. The corrosion inhibitor of claim 1 wherein the aromatic, nitrogen-containing ring is selected from oxazole, thiazole, acridine, cinnoline, quinoxazoline, pyridazine, pyridine, pryimidine, quinazolinie, quinoline and isoquinoline.

3. The corrosion inhibitor of claim 2 wherein L is C₁-C₁₀ alkylene or C₂-C₁₀ alkenylene.

4. The corrosion inhibitor of claim 3 wherein L is methylene.

5. The corrosion inhibitor of claim 2 wherein L is a group of formula —

CH₂CH(OR₂)CH₂—

.

6. The corrosion inhibitor of claim 1 wherein the aromatic, nitrogen-containing ring is selected from pyridine and quinoline.

7. The corrosion inhibitor of claim 6 wherein L is C₁-C₁₀ alkylene, C₂-C₁₀ alkenylene or a group of formula —

CH₂CH(OR₂)CH₂—

.

8. The corrosion inhibitor of claim 7 wherein the pyridine or quinoline is substituted with 1-4 C₁-C₆ alkyl, C₂-C₆ alkenyl, or C₁-C₆ aminoalkyl groups, or a mixture thereof.

9. The corrosion inhibitor of claim 8 wherein L is methylene.

10. The corrosion inhibitor of claim 1 of formula

11. The corrosion inhibitor of claim 10 wherein R₃-R₆ are independently selected from H, C₁-C₆ alkyl, C₂-C₆ alkenyl, or C₁-C₆ aminoalkyl, or a mixture thereof.

12. The corrosion inhibitor of claim 1 of formula

13. The corrosion inhibitor of claim 12 wherein R₃-R₆ are independently selected from H, C₁-C₆ alkyl, C₂-C₆ alkenyl, or C₁-C₆ aminoalkyl, or a mixture thereof.

14. A corrosion inhibitor composition comprising 5 to 50 weight percent of the corrosion inhibitor of claim 1 dispersed or dissolved in one or more organic solvents.

15. The corrosion inhibitor composition of claim 14 wherein the organic solvents are selected from alcohols, glycols and aliphatic and aromatic hydrocarbons.

16. The corrosion inhibitor composition of claim 15 wherein the organic solvents comprise ethylene glycol monobutyl ether.

17. The corrosion inhibitor composition of claim 16 comprising 5 to 20 weight percent of the corrosion inhibitor of claim 1.

18. A method of inhibiting corrosion of a metallic surface in contact with a fluid in oil and gas applications comprising adding to the fluid an effective corrosion-inhibiting amount of one or more quaternary nitrogen-containing corrosion inhibitors according to claim 1.

19. The method of claim 18 wherein the fluid comprises oil or gas and water.