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US-20260125604-A1 - REFINERY CRUDE DISTILLATION UNIT CORROSION INHIBITOR

US20260125604A1US 20260125604 A1US20260125604 A1US 20260125604A1US-20260125604-A1

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.

Inventors

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

Assignees

  • SAUDI ARABIAN OIL COMPANY

Dates

Publication Date
20260507
Application Date
20251230

Claims (20)

  1. 1 . A method for inhibiting corrosion of a refinery crude distillation unit, the method comprising: introducing corrosion inhibition composition to the refinery crude distillation unit, wherein the corrosion inhibition composition consists essentially of a carrier fluid and a compound represented by Formula (I): wherein R 1 , R 2 , R 3 , and R 4 are each, independently, a hydrogen, an alkoxy group, or a hydrocarbon 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.
  2. 2 . The method of claim 1 , wherein the corrosion inhibition efficiency of the corrosion inhibition composition is in a range from 75% to 100%.
  3. 3 . The method of claim 1 , wherein the corrosion inhibition composition has a corrosion rate of 20 mpy or less.
  4. 4 . The method of claim 1 , wherein at least one of R 1 , R 2 , R 3 , and R 4 is an alkoxy group.
  5. 5 . The method of claim 4 , wherein the alkoxy group is selected from the group consisting a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, and combinations thereof.
  6. 6 . The method of claim 5 , wherein the alkoxy group is an ethoxy group.
  7. 7 . The method of claim 1 , wherein at least one of R 1 , R 2 , R 3 , and R 4 is formed from reaction between an amine and an epoxide.
  8. 8 . The method of claim 1 , wherein the corrosion inhibitor consists essentially of a compound represented by Formula (II):
  9. 9 . 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.
  10. 10 . The method of claim 1 , further comprising coating one or more inner surfaces of the refinery crude distillation unit.
  11. 11 . 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.
  12. 12 . The method of claim 11 , 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.
  13. 13 . 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.
  14. 14 . The method of claim 1 , wherein the corrosion inhibition efficiency is at least 80%.
  15. 15 . The method of claim 1 , wherein the corrosion inhibition efficiency is at least 90%.
  16. 16 . The method of claim 1 , wherein the corrosion inhibition efficiency is measured in the presence of an acidic brine.
  17. 17 . The method of claim 1 , further comprising, prior to the introducing, preparing the corrosion inhibition composition.
  18. 18 . The method of claim 16 , 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.
  19. 19 . The method of claim 18 , 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.
  20. 20 . 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.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a Continuation of U.S. application Ser. No. 18/525,371, the entire contents of which are incorporated herein by reference for all purposes. BACKGROUND In hydrocarbon-bearing systems, corrosion often occurs due to water contamination, bacteria, and dissolved gases present in hydrocarbon-based products. Typically, corrosion inhibitors are commonly added to fluids in hydrocarbon-bearing systems in order to protect surfaces of such systems from corrosion. Corrosion inhibitors are adsorbed on to the surface of hydrocarbon-bearing systems, forming a protective layer. Common corrosion inhibitors include imidazolines, amido-amines and pyrimidine salts, and tend to be expensive and toxic to people and the environment. Accordingly, there exists a need for nontoxic, inexpensive corrosion inhibitors that are effective at low concentrations. SUMMARY This summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter. In one aspect, embodiments disclosed herein relate to a method for inhibiting corrosion in a refinery crude distillation unit that 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 R1, R2, R3, and R4 are each, independently, a hydrogen or an alkoxy group, and m and n are each, independently integers ranging from 2 to 10, wherein R5 and R6 are each, independently, a saturated C6-C10 hydrocarbon group or an unsaturated C6-C10 hydrocarbon group. Other aspects and advantages of the claimed subject matter will be apparent from the following description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows a crude distillation unit in accordance with one or more embodiments. FIG. 2 is a Fourier Transform Infrared Spectrum of a synthesized ethoxylated fatty diamine in accordance with one or more embodiments. DETAILED DESCRIPTION Embodiments in accordance with the present disclosure generally relate to a corrosion inhibition composition and methods of using the corrosion inhibition composition to inhibit corrosion in a refinery crude distillation unit. The corrosion inhibitor may be derived from one or more fatty diamines. Methods of one or more embodiments involve introducing a corrosion inhibition composition to a crude distillation. Such methods may inhibit corrosion of at least one inner surface of the crude distillation unit by providing a corrosion inhibiting coating on at least one inner surface of the crude distillation unit. Corrosion Inhibition Composition One or more embodiments of the present disclosure relate to a corrosion inhibition composition comprising a carrier fluid and a corrosion inhibitor. The corrosion inhibitor consists essentially of a compound represented by Formula (I): where R1, R2, R3, and R4 are each, independently, a hydrogen or an alkyl group, and m and n are each, independently integers ranging from 2 to 10, and wherein R5 and R6 are each, independently, a saturated C6-C10 hydrocarbon group or an unsaturated C6-C10 hydrocarbon group. The corrosion inhibitor consisting essentially of the compound represented by Formula (I) includes the compound represented by Formula (I), includes impurities not affecting corrosion inhibition activity, such as synthesis impurities, and exclude other compounds with corrosion inhibition activity. Thus, the corrosion inhibition activity of the corrosion inhibitor consisting essentially of the compound represented by Formula (I) is due to the compound represented by Formula (I). In one or more embodiments, the corrosion inhibition composition consists essentially of the present corrosion inhibitor. The corrosion inhibition composition consisting essentially of the present corrosion inhibitor includes the present corrosion inhibitor and other additives not affecting corrosion inhibition activity of the corrosion inhibitor and excludes other additives affecting corrosion inhibition activity of the corrosion inhibitor. Thus, the corrosion inhibition activity of the corrosion inhibition composition is due to the compound represented by Formula (I). The corrosion inhibitor may be the compound represented by Formula (I). Thus, in one or more embodiments, the corrosion inhibitor consists of the compound represented by Formula (I). The corrosion inhibition composition may be a combination of the carrier fluid and the corrosion inhibitor, Thus, in one or more embodiments, corrosion inhibition composition consists of the carrier fluid and the corros