Oil soluble molybdenum complexes for inhibiting high temperature corrosion and related applications in petroleum refineries

Patent metadata

Field	Value
Publication number	US-11767596-B2
Application number	US-202016942194-A
Country	US
Kind code	B2
Filing date	Jul 29, 2020
Priority date	Jul 29, 2019
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

Disclosed are molybdenum-containing complexes used in compositions and methods for inhibiting or reducing high temperature corrosion in petroleum refineries.

First claim

What is claimed is:

1. A method of inhibiting corrosion of a metal containment in a crude oil refining process, wherein the metal containment comprises an acidic fluid source containing crude oil or a fraction thereof and an acidic corrodents, comprising:
introducing into the acidic fluid source at least one molybdenum-containing complex having the formula selected from the group consisting of Formula I, II, III, and IV; wherein the acidic fluid source has a temperature in the range of 175° C. to 600° C.; wherein the acidic corrodents comprise a naphthenic acid and sulfur in the form of hydrogen sulfide, an organic sulfide, a mercaptan, or sulfur dioxide; and wherein each of Formula I, II, III, or IV is given by the following:

wherein R 1 , R 2 , R 3 , and R 4 , are each a hydrocarbon group and wherein R 1 , R 2 , R 3 , and R 4 can be the same or different; and X is oxygen or sulfur and X can be the same or different;

wherein Y 1 and Y 2 are each oxygen, nitrogen or carbon-containing ligands and Y 1 and Y 2 can be the same or different and X is each oxygen or sulfur, and X can be the same of different from each other.

2. The method of claim 1 , wherein the acidic fluid source comprises at least a crude oil fraction.

3. The method of claim 1 , wherein the acidic corrodents comprise at least naphthenic acid, sulfur or combinations thereof.

4. The method of claim 1 , wherein the acidic fluid source comprises a TAN of 0.2 to 20.

5. The method of claim 1 , wherein the molybdenum-containing complex is added to the acidic fluid source from 1 ppm to 3,000 ppm.

6. The method of claim 1 , wherein the molybdenum-containing complex comprises at least one of a molybdenum dithiocarbamate, a molybdenum dithiophosphate, polymers thereof and combinations thereof.

7. The method of claim 1 , wherein the at least one molybdenum-containing complex comprises a molybdenum alkyldithiocarbamate.

8. The method of claim 7 , wherein the alkyldithiocarbamate is an ethyl hexyl dithiocarbamate.

9. The method of claim 1 , wherein the at least one molybdenum-containing complex comprises a molybdenum alkyldithiophosphate.

10. The method of claim 9 , wherein the molybdenum alkyldithiophosphate comprises a molybdenum dialkylthiophosphate, molybdenum ethyl hexyl dithiophosphate, a molybdenum dithiophosphate comprising a straight chain C6-C10 alcohol, or mixtures thereof.

11. The method of claim 1 , wherein the molybdenum-containing complex provides at least 70% corrosion protection in a 1018 carbon steel coupon test.

12. A method of inhibiting corrosion of a metal containment in a crude oil refining process, wherein the metal containment comprises an acidic fluid source containing crude oil or a fraction thereof and an acidic corrodent that causes the metal containment to corrode, comprising:
pre-passivating a metal surface of the metal containment to provide a treated, pre-passivated process containment surface, said pre-passivating comprising contacting the metal surface with a corrosion inhibiting, passivating composition comprising at least one molybdenum-containing complex;
contacting the treated, pre-passivated process containment surface with the acidic fluid source; and
introducing into the acidic fluid source at least one molybdenum-containing complex in an amount effective to reduce corrosion associated with the acidic corrodent.

Assignees

• Ecolab Usa Inc

Inventors

• Zenasni Oussama
• Pennington Janelle
• Colorado Jr Ramon
• Thornthwaite Philip Andrew

Classifications

• C23F11/1673 Primary

  Esters of phosphoric or thiophosphoric acids · CPC title

• C23F11/165

  Heterocyclic compounds containing sulfur as hetero atom · CPC title

• C10G7/10

  Inhibiting corrosion during distillation · CPC title

• C10G75/02 Primary

  by addition of corrosion inhibitors · CPC title

• C10G75/04

  by addition of antifouling agents · CPC title