Method and composition for preventing corrosion of metal surfaces
View Patent ↗The present invention provides a corrosion inhibitor composition comprising: a carrier; at least one compound of formulae (II)-(VII) or a salt or quaternized derivative thereof: wherein R is C 5-21 alkyl or alkenyl, preferably alkyl; each R 1 is independently an optionally substituted group of formula —(CH 2 ) n X wherein n is an integer from 1 to 6 and X is C(O)OZ or SO 3 Z and Z is H or a cation; and R′ is C 4-20 alkyl or alkenyl, preferably alkyl; and a quaternary ammonium compound.
1. A corrosion inhibitor composition comprising:
a carrier;
at least one compound of formulae (II)-(III) or a salt thereof:
wherein
R is C 11 alkyl or C 11 -C 13 alkyl;
R 1 is —CH 2 C(O)OZ, and Z is H or a cation; and
a quaternary ammonium compound comprising at least one alkyl quat of formula (VIII):
wherein R 3 and R 4 are methyl, R 5 and R 6 are decyl and A − is a carbonate or bicarbonate counter ion.
2. A composition as claimed in claim 1 comprising the at least one compound of formula (II) and the at least one compound of formula (III).
3. A corrosion inhibitor composition comprising:
a carrier;
at least one compound of formulae (II)-(III) or a salt thereof:
wherein R is C 5-21 alkyl or C 5-21 alkenyl; R 1 is —CH 2 CH(OH)CH 2 SO 3 Z and Z is H or a cation; and
a quaternary ammonium compound comprising at least one alkyl quat, at least one ester quat, or a combination thereof.
4. A composition as claimed in claim 1 , wherein said compound of formulae (II)-(III) has a toxicity (EC 50 ), measured by a standard test: ISO 10253 1998 water quality—marine algal growth inhibition test with Skeletonema costatum , of at least 0.5 mg/L.
5. A composition as claimed in claim 3 , wherein said alkyl quat is of formula (VIII):
wherein each of R 3 , R 4 , R 5 and R 6 is independently a C 1-20 alkyl group and A − is a halide, sulphate, carbonate or bicarbonate counter ion.
6. A composition as claimed in claim 5 comprising a compound of formula (VIIIa):
wherein A − is a sulphate or carbonate counter ion.
7. A composition as claimed in claim 3 , wherein said ester quat is of formula (IX):
wherein
R 8 , R 9 and R 10 are each independently C 1-4 alkyl, C 1-4 hydroxyalkyl, C 6-12 aryl, alkylaryl containing 7 to 13 carbon atoms or a group corresponding to formula (X):
—(C m H 2m —O) q —C(O)—R 11 (X)
wherein m is an integer 2 or 3, q is an integer from 1 to 3 and R 11 is a C 7-23 alkyl or C 7-23 alkenyl group;
R 7 is a group corresponding to formula (X) or (XI):
wherein R 8 , R 9 and R 10 are as defined above, G is a group —(CH 2 ) p — or a group —(CH 2 ) p -E-CO-D-CO-E-(CH 2 ) p — wherein p is an integer of 1 to 6, E is NH or O and D is a dimer fatty acid residue containing on average 36 to 54 carbon atoms; and
B − is an anion.
8. A composition as claimed in claim 1 , wherein said carrier comprises at least one of methylethyl glycol, EGMBE and diethyl glycol.
9. A composition as claimed in claim 1 , further comprising a sulphur-containing species comprising a thiosulphate salt, 2-mercaptoethanol, thioglycolic acid, Na 2 SO 3 , or a C 1-8 alkyl thiol.
10. A composition as claimed in claim 1 , further comprising a surfactant.
11. A method of reducing, inhibiting or preventing corrosion of a metal surface, comprising contacting said surface with a corrosion inhibitor composition as defined in claim 1 .
12. A method as claimed in claim 11 , wherein said metal surface is used in the recovery, transportation or refining of hydrocarbon.
13. A kit for the preparation of a corrosion inhibitor composition comprising:
(i) a first container comprising at least one compound of formulae (II)-(III) or a salt thereof as defined in claim 1 ;
(ii) a second container comprising a quaternary ammonium compound as defined in claim 1 ; and
(iii) instructions for preparation of the corrosion inhibitor composition.
14. A kit as claimed in claim 13 , further comprising a sulphur-containing species in one of said containers or in a separate container.
15. A composition as claimed in claim 3 , comprising at least one compound of formula (II), at least one compound of formula (III), and either an ester quat or an alkyl quat of formula (VIIIa):
wherein A − is a sulphate or carbonate counter ion.
16. A composition as claimed in claim 15 , wherein the ester quat comprises an oleyl triethanolamine ester quat or a compound of formula (IX):
wherein
R 8 , R 9 and R 10 are each independently C 1-4 alkyl, C 1-4 hydroxyalkyl, C 6-12 aryl, alkylaryl containing 7 to 13 carbon atoms or a group corresponding to formula (X):
—(C m H 2m —O) q —C(O)—R 11 (X)
wherein m is an integer 2 or 3, q is an integer from 1 to 3 and R 11 is a C 7-23 alkyl or C 7-23 alkenyl group;
R 7 is a group corresponding to formula (X) or (XI):
wherein R 8 , R 9 and R 10 are as defined above, G is a group —(CH 2 ) p — or a group —(CH 2 ) p -E-CO-D-CO-E-(CH 2 ) p — wherein p is an integer of 1 to 6, E is NH or O and D is a dimer fatty acid residue containing on average 36 to 54 carbon atoms; and
B − is an anion.
17. A composition as claimed in claim 3 , wherein the ester quat comprises an oleyl triethanolamine ester quat.
18. A composition as claimed in claim 1 , wherein the at least one compound of formulae (II)-(III) comprises a quaternary salt.
19. A composition as claimed in claim 1 , further comprising an anionic surfactant.
20. A composition as claimed in claim 19 , wherein the anionic surfactant comprises a phosphate ester, alkyl ether carboxylate, or a metal salt thereof.
21. A composition as claimed in claim 20 , wherein the phosphate ester comprises a C 6 -C 22 alkyl mono-substituted ester containing ethylene oxide or propylene oxide groups or a C 6 -C 22 alkyl di-substituted ester containing ethylene oxide or propylene oxide groups.
22. A composition as claimed in claim 19 , wherein the anionic surfactant comprises a C 6 -C 22 alkyl ether carboxylate, a C 6 -C 22 alkyl ether carboxylate containing ethylene oxide or propylene oxide groups, or a combination thereof.
23. A composition as claimed in claim 1 , wherein the weight ratio of the compound of formulae (II) or (III) to the alkyl quat is 10:1 to 0.1:1.
24. A composition as claimed in claim 3 , further comprising a sulphur-containing species comprising a thiosulphate salt, 2-mercaptoethanol, thioglycolic acid, Na 2 SO 3 , or a C 1-8 alkyl thiol.
25. A composition as claimed in claim 3 , wherein the at least one compound of formulae (II)-(III) comprises a quaternary salt.
26. A composition as claimed in claim 3 , further comprising an anionic surfactant.
27. A composition as claimed in claim 26 , wherein the anionic surfactant comprises a phosphate ester, alkyl ether carboxylate, or a metal salt thereof.
28. A composition as claimed in claim 27 , wherein the phosphate ester comprises a C 6 -C 22 alkyl mono-substituted ester containing ethylene oxide or propylene oxide groups or a C 6 -C 22 alkyl di-substituted ester containing ethylene oxide or propylene oxide groups.
29. A composition as claimed in claim 26 , wherein the anionic surfactant comprises a C 6 -C 22 alkyl ether carboxylate, a C 6 -C 22 alkyl ether carboxylate containing ethylene oxide or propylene oxide groups, or a combination thereof.
30. A composition as claimed in claim 3 , wherein the weight ratio of the compound of formulae (II) or (III) to the ester quat is 5:1 to 0.1:1.