Corrosion inhibitors for a refinery

Patent metadata

Field	Value
Publication number	US-2021180194-A1
Application number	US-201916715637-A
Country	US
Kind code	A1
Filing date	Dec 16, 2019
Priority date	Dec 16, 2019
Publication date	Jun 17, 2021
Grant date	—

Abstract

Corrosion inhibitor compositions and methods for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid are provided. The corrosion inhibitor composition can comprise 2-aminoterephthalic acid, dimethyl sulfoxide and heavy aromatic naphtha (HAN). In another embodiment, the composition can comprise 4-methylamino benzoic acid or 4-methylsulfonyl benzoic acid, N-methyl pyrrolidone, and HAN. In the method, a corrosion inhibitor composition comprising 2-aminoterephthalic acid, 4-methylamino benzoic acid, or 4-methylsulfonyl benzoic acid can be added to a hydrocarbon fluid exposed to the metal surface. The corrosion can be caused by naphthenic acid.

First claim

What is claimed is:

1 . A corrosion inhibitor composition, comprising:
2-aminoterephthalic acid; dimethyl sulfoxide; and heavy aromatic naphtha (HAN).

2 . The corrosion inhibitor composition of claim 1 , wherein the composition comprises approximately:
10-30 weight % of 2-aminoterephthalic acid; 60-80 weight % of dimethyl sulfoxide; and 10-30 weight % heavy aromatic naphtha.

3 . The corrosion inhibitor composition of claim 1 , wherein the composition comprises approximately:
20 weight % of 2-aminoterephthalic acid; 70 weight % of dimethyl sulfoxide; and 10 weight % heavy aromatic naphtha.

4 . The corrosion inhibitor composition of claim 1 , wherein the corrosion inhibitor composition inhibits corrosion caused by naphthenic acid.

5 . The corrosion inhibitor composition of claim 1 , wherein the composition is free of phosphate.

6 . A corrosion inhibitor composition, comprising:
a corrosion inhibitor, wherein the corrosion inhibitor is 4-methylamino benzoic acid or 4-methylsulfonyl benzoic acid; N-methyl pyrrolidone; and heavy aromatic naphtha.

7 . The corrosion inhibitor composition of claim 6 , wherein the composition comprises approximately:
10-30 weight % of the corrosion inhibitor; 60-80 weight % of N-methyl pyrrolidone; and 10-30 weight % heavy aromatic naphtha (HAN).

8 . The corrosion inhibitor composition of claim 7 , wherein the corrosion inhibitor is 4-methylamino benzoic acid.

9 . The corrosion inhibitor composition of claim 7 , wherein the corrosion inhibitor is 4-methylsulfonyl benzoic acid.

10 . The corrosion inhibitor composition of claim 6 , wherein the composition comprises approximately:
20 weight % of the corrosion inhibitor; 70 weight % of N-methyl pyrrolidone; and 10 weight % heavy aromatic naphtha (HAN).

11 . The corrosion inhibitor composition of claim 10 , wherein the corrosion inhibitor is 4-methylamino benzoic acid.

12 . The corrosion inhibitor composition of claim 10 , wherein the corrosion inhibitor is 4-methylsulfonyl benzoic acid.

13 . The corrosion inhibitor composition of claim 6 , wherein the corrosion is caused by naphthenic acid.

14 . The corrosion inhibitor composition of claim 6 , wherein the composition is free of phosphate.

15 . A method for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid, the method comprising:
adding a corrosion inhibitor composition to the hydrocarbon fluid exposed to the metal surface, wherein the corrosion inhibitor composition comprises 2-aminoterephthalic acid, 4-methylamino benzoic acid, or 4-methylsulfonyl benzoic acid.

16 . The method of claim 15 , wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 100 ppm to approximately 1000 ppm.

17 . The method of claim 15 , wherein the corrosion inhibitor composition comprises 2-aminoterephthalic acid, and further comprises dimethyl sulfoxide, and heavy aromatic naphtha (HAN).

18 . The method of claim 17 , wherein the corrosion inhibitor composition comprises approximately: 20 weight % of 2-aminoterephthalic acid, 70 weight % of dimethyl sulfoxide, and 10 weight % heavy aromatic naphtha, and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 250 ppm.

19 . The method of claim 15 , wherein the corrosion inhibitor composition comprises 4-methylamino benzoic acid, and further comprises N-methyl pyrrolidone, and heavy aromatic naphtha.

20 . The method of claim 19 , wherein the corrosion inhibitor composition comprises approximately: 20 weight % of, 4-methylamino benzoic acid, 70 weight % of N-methyl pyrrolidone, and 10 weight % heavy aromatic naphtha (HAN), and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 500 ppm.

21 . The method of claim 15 , wherein the corrosion inhibitor composition comprises 4-methylsulfonyl benzoic acid, and further comprises N-methyl pyrrolidone, and heavy aromatic naphtha.

22 . The method of claim 21 , wherein the corrosion inhibitor composition comprises approximately: 20 weight % of 4-methylsulfonyl benzoic acid, 70 weight % of N-methyl pyrrolidone, and 10 weight % heavy aromatic naphtha (HAN), and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 1000 ppm.

23 . The method of claim 15 , wherein corrosion inhibitor composition is added to the hydrocarbon fluid in a refinery process, wherein the refinery process is performed at a temperature of approximately 200° C. to approximately 400° C., and wherein the corrosion inhibitor composition inhibits naphthenic acid corrosion on the metal surface.

Assignees

• Saudi Arabian Oil Co

Inventors

• Nagu Muthukumar
• Alanazi Nayef M

Classifications

• C23F11/16

  Sulfur-containing compounds · CPC title

• C10G21/22

  Compounds containing sulfur, selenium, or tellurium · CPC title

• C10G75/02 Primary

  by addition of corrosion inhibitors · CPC title

• C10G21/20

  Nitrogen-containing compounds · CPC title

• C23F11/144 Primary

  Aminocarboxylic acids · CPC title