2-(p-alkoxyphenyl)-2-imidazolines and their use as corrosion inhibitors

Patent metadata

Field	Value
Publication number	US-9816024-B2
Application number	US-201514727393-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	Jun 1, 2015
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An aminoalkyl imidazolines of the formula:

having p-octyloxy-, p-dodecyloxy-, or p-octadecyloxy-phenyl pendants as hydrophobes, for use to mitigate mild steel corrosion. An electron-rich aromatic ring, in conjugation with an amidine motif, imparts increasing corrosion inhibition efficiencies with an increasing hydrophobe chain length. X-ray photoelectron spectroscopy confirms the formation of an aminoalkyl imidazoline film on a metal surface prior to reaching a critical molar concentration.

First claim

The invention claimed is:

1. A composition comprising an aminoalkyl imidazoline of formula (I)

wherein m is an integer of 1 to 10;
R is a C 1 -C 6 alkylene;
R 1 is an aromatic hydrocarbon of formula (II)

wherein X is a heteroatom selected from the group consisting of oxygen and sulfur;
R′ 1 thru R′ 4 are each independently selected from the group consisting of hydrogen, C 1 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, and aminoaryl;
R′ 5 is selected from the group consisting of hydrogen, C 5 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, and aminoaryl; and
R 2 and R 3 and are each independently selected from the group consisting of hydrogen, hydroxyl, halogen, C 1 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, aminoaryl, (CH 2 ) 2 COOH, CH 2 CH(CH 3 )COOH, and imidazoline.

2. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
an ethanamine group at a 5-N position of the 2-imidazoline ring, and
a p-octyloxy phenyl group at a 1-C position of the 2-imidazoline ring.

3. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
an ethanamine group at a 5-N position of the 2-imidazoline ring, and
a p-dodecyloxy phenyl group at a 1-C position of the 2-imidazoline ring.

4. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
an ethanamine group at a 5-N position of the 2-imidazoline ring, and
a p-octadecyloxy phenyl group at the 1-C position of the 2-imidazoline ring.

5. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
a N 1 -(2-aminoethyl)-N 2 -ethylethane-1,2-diamine group at a 5-N position of the 2-imidazoline ring, and
a p-octyloxy phenyl group at a 1-C position of the 2-imidazoline ring.

6. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
a N 1 -(2-aminoethyl)-N 2 -ethylethane-1,2-diamine group at a 5-N position of the 2-imidazoline ring, and
a p-dodecyloxy phenyl group at a 1-C position of the 2-imidazoline ring.

7. The composition of claim 1 wherein the aminoalkyl imidazoline comprises
a 2-imidazoline ring substituted with:
a N 1 -(2-aminoethyl)-N 2 -ethylethane-1,2-diamine group at a 5-N position of the 2-imidazoline ring, and
a p-octadecyloxy phenyl group at the 1-C position.

8. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting diethylene triamine (DETA) with 4-(octyloxy) cyclohexanecarbonitrile in the presence of a cysteine HCl catalyst at a temperature of 145° C. to yield 1-(2-aminoethyl)-2-(4-octyloxyphenyl)-2-imidazoline.

9. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting diethylene triamine (DETA) with 4-(dodecyloxy) cyclohexanecarbonitrile in the presence of a cysteine HCl catalyst at a temperature of 145° C. to yield 1-(2-aminoethyl)-2-(4-dodecyloxyphenyl)-2-imidazoline.

10. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting diethylene triamine (DETA) with 4-(octadecyloxy) cyclohexanecarbonitrile in the presence of a cysteine HCl catalyst at a temperature of 145° C. to yield 1-(2-aminoethyl)-2-(4-octadecyloxyphenyl)-2-imidazoline.

11. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting tetraethylene pentamine (TEPA) with 4-(octyloxy) cyclohexanecarbonitrile to yield 1-[2-{2-(2-aminoethylamino) ethylamino}ethyl]-2-(4-octyloxyphenyl)-2-imidazoline in the presence of a cysteine HCl catalyst at a temperature of 145° C.

12. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting tetraethylene pentamine (TEPA) 4-(dodecyloxy) cyclohexanecarbonitrile to yield 1-[2-{2-(2-aminoethylamino)ethylamino}ethyl]-2-(4-dodecyloxyphenyl)-2-imidazoline in the presence of a cysteine HCl catalyst at a temperature of 145° C.

13. The composition of claim 1 wherein the aminoalkyl imidazoline is prepared by reacting tetraethylene pentamine (TEPA) 4-(octadecyloxy) cyclohexanecarbonitrile to yield 1-[2-{2-(2-aminoethylamino)ethylamino}ethyl]-2-(4-octadecyloxyphenyl)-2-imidazoline in the presence of a cysteine HCl catalyst at a temperature of 145° C.

14. The composition of claim 1 further comprising one or more additives selected from the group consisting of surfactants, intensifiers, solvents, oil-wetting components, dispersants, scale inhibitors and biocides.

15. A method of inhibiting a metal corrosive process of a mild steel surface in contact with a process stream comprising at least one constituent selected from the group consisting of water, petroleum, and petroleum products, the method comprising:
contacting the mild steel surface with the composition of claim 1 by
spraying the mild steel surface with the composition,
dipping the mild steel surface into the composition, and/or
adding the composition to said process stream and contacting said mild steel surface with the process stream.

16. A method of preventing or reducing corrosion, comprising:
adding to a process stream an effective corrosion inhibiting amount of one or more aminoalkyl imidazolines of formula (I)

wherein m is an integer of 1 to 10;
R is a C 1 -C 6 alkylene;
R 1 is an aromatic hydrocarbon of formula (II)

wherein X is a heteroatom selected from the group consisting of oxygen and sulfur;
R′ 1 thru R′ 4 are each independently selected from the group consisting of hydrogen C 1 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, and aminoaryl;
R′ 5 is selected from the group consisting of hydrogen, C 5 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, and aminoaryl; and
R 2 and R 3 and are each independently selected from the group consisting of hydrogen, hydroxyl, halogen, C 1 -C 30 alkyl, alkenyl, aryl, alkylaryl, arylalkyl, aminoalkyl, aminoaryl, (CH 2 ) 2 COOH, CH 2 CH(CH 3 )COOH, and imidazoline.

17. The method of claim 16 wherein the process stream comprises at least one constituent selected from the group consisting of water, petroleum, and petroleum products, and at least one constituent selected from the group consisting of carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S), and NaCl.

18. The method of claim 16 , wherein said effective corrosion inhibiting amount is 0.1 to 1,000 ppm by weight of the aminoalkyl imidazoline.

19. The method of claim 16 , wherein said effective corrosion inhibiting amount is 1.0 to 500 ppm by weight of the aminoalkyl imidazoline.

20. The method of claim 16 wherein said adding of the aminoalkyl imidazolines is continuous or intermittent.

Assignees

• Univ King Fahd Pet & Minerals
• King Fahd Univ Of Pertoleum And Minerals

Inventors

• Jafar Mazumder Mohammad Abu
• Ali Shaikh Asrof
• Al-Muallem Hasan Ali

Classifications

• C09K2208/32

  Anticorrosion additives · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C09K8/54 Primary

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title