Naphthenic acid corrosion inhibitors for a refinery

Patent metadata

Field	Value
Publication number	US-11345867-B2
Application number	US-202117304815-A
Country	US
Kind code	B2
Filing date	Jun 25, 2021
Priority date	Jun 15, 2020
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Corrosion inhibitor compositions and methods for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid are provided. The corrosion inhibition compositions can include a corrosion inhibitor, such as 3-dimethylamino benzoic acid, 4-dimethylamino benzoic acid, or 2,5-dihydroxyterephthalic acid. The corrosion inhibitor composition can further comprise dimethyl sulfoxide, and heavy aromatic naphtha. The corrosion inhibitor composition can be phosphate-free and can inhibit naphthenic acid corrosion. In the methods, a corrosion inhibitor composition is added to the hydrocarbon fluid exposed to the metal surface to prevent or inhibit corrosion on the metal surface, including naphthenic acid corrosion.

First claim

What is claimed is:

1. A corrosion inhibitor composition, comprising:
a corrosion inhibitor, wherein the corrosion inhibitor is 3-dimethylamino benzoic acid (3-DMAB) or 4-dimethylamino benzoic acid (4-DMAB);
dimethyl sulfoxide; and
heavy aromatic naphtha.

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

3. The corrosion inhibitor composition of claim 1 , wherein the corrosion inhibitor is 4-DMAB and wherein the composition comprises approximately:
10 weight % of 4-DMAB;
80 weight % of dimethyl sulfoxide; and
10 weight % heavy aromatic naphtha.

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

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

Assignees

• Saudi Arabian Oil Co

Inventors

• Nagu Muthukumar
• Alanazi Nayef M

Classifications

• C10G2300/1044

  Heavy gasoline or naphtha having a boiling range of about 100 - 180 °C · CPC title

• C10G9/16

  Preventing or removing incrustation · CPC title

• C10G75/02 Primary

  by addition of corrosion inhibitors · CPC title

• C10G2300/80

  Additives · CPC title

• C10G7/10

  Inhibiting corrosion during distillation · CPC title