Refinery crude distillation unit corrosion inhibitor

Patent metadata

Field	Value
Publication number	US-12570907-B2
Application number	US-202318525371-A
Country	US
Kind code	B2
Filing date	Nov 30, 2023
Priority date	Nov 30, 2023
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A method for inhibiting corrosion in a refinery crude distillation unit includes introducing a corrosion inhibition composition to the refinery crude distillation unit. The corrosion inhibition efficiency of the corrosion inhibition composition may be at least 80%. The corrosion inhibition composition may include a carrier fluid and a corrosion inhibitor consisting essentially of a compound represented by Formula (I):

where R 1 , R 2 , R 3 , and R 4 are each, independently, a hydrogen or an alkoxy group, and m and n are each, independently integers ranging from 2 to 10, wherein R 5 and R 6 are each, independently, a saturated C 6 -C 10 hydrocarbon group or an unsaturated C 6 -C 10 hydrocarbon group.

First claim

What is claimed:

1 . A method for inhibiting corrosion in a refinery crude distillation unit, the method comprising: introducing a corrosion inhibition composition to the refinery crude distillation unit, wherein the corrosion inhibition composition comprises a carrier fluid and a corrosion inhibitor consisting essentially of a compound represented by Formula (I):

where R 1 , R 2 , R 3 , and R 4 are each, independently, a hydrogen or an alkoxy group, and m and n are each, independently integers ranging from 2 to 10, wherein: at least one of R 1 , R 2 , R 3 , and R 4 is the alkoxy group; and R 5 and R 6 are each, independently, a saturated C 6 -C 10 hydrocarbon group or an unsaturated C 6 -C 10 hydrocarbon group, and wherein the corrosion inhibition efficiency of the corrosion inhibition composition is at least 80%.

2 . The method of claim 1 , wherein R 1 , R 2 , R 3 , and R 4 of the corrosion inhibition composition are each, independently, an ethoxy group.

3 . The method of claim 1 , wherein the corrosion inhibitor consisting essentially of a compound represented by Formula (I) is a reaction product derived from a fatty diamine and an epoxide.

4 . The method of claim 1 , wherein the corrosion inhibitor consists essentially of a compound represented by Formula (II):

5 . The method of claim 1 , further comprising measuring a corrosion inhibition efficiency of the corrosion inhibition composition in the presence of acidic brine prior to introducing the corrosion inhibition composition to the refinery crude distillation unit.

6 . The method of claim 1 , further comprising coating one or more inner surfaces of the refinery crude distillation unit.

7 . The method of claim 1 , further comprising:
removing the corrosion inhibition from the composition; and feeding a crude hydrocarbon feedstock to the refinery crude distillation unit.

8 . The method of claim 7 , wherein the crude hydrocarbon feedstock is an acidic fluid comprising a mixture of components selected from at least one hydrocarbon, water, at least one organic acid, at least one inorganic acid, and an acid forming compound.

9 . The method of claim 1 , further comprising separating a crude hydrocarbon feedstock into one two or more fractions in a coated refinery crude distillation unit.

10 . The method of claim 1 , wherein the corrosion inhibition efficiency is at least 90%.

11 . The method of claim 1 , wherein the corrosion inhibition efficiency is measured in the presence of an acidic brine.

12 . The method of claim 1 , further comprising, prior to the introducing, preparing the corrosion inhibition composition.

13 . The method of claim 12 , further comprising, prior to preparing the corrosion inhibition composition, producing the corrosion inhibitor consisting essentially of a compound represented by Formula (I) by reacting ethylene oxide with a diamine represented by Formula (III):

wherein R 5 and R 6 are each, independently, a saturated C 6 -C 10 hydrocarbon group or an unsaturated C 6 -C 10 hydrocarbon group.

14 . The method of claim 13 , wherein the diamine is Priamine™ 1074.

15 . The method of claim 13 , wherein the preparing the corrosion inhibition composition comprises dissolving the corrosion inhibitor in a range from 10 wt % to 50 wt % in the carrier fluid based on the total weight of the corrosion inhibition composition.

16 . The method of claim 1 , wherein the carrier fluid is selected from the group consisting of diesel, heavy aromatic naphtha, benzene, toluene, isopropyl alcohol, and combinations thereof.

Assignees

• Saudi Arabian Oil Co

Inventors

• Nagu Muthukumar
• Alanazi Nayef M
• Ramasamy Jothibasu
• Santra Ashok

Classifications

• C23F11/146

  containing a multiple nitrogen-to-carbon bond · CPC title

• C10L10/04

  for minimising corrosion or incrustation · CPC title

• C23F11/142

  Hydroxy amines · CPC title

• C10G7/12 Primary

  Controlling or regulating · CPC title

• C10G2300/203

  Naphthenic acids, TAN · CPC title