Corrosion inhibitor compositions and methods of using same

Patent metadata

Field	Value
Publication number	US-10450659-B2
Application number	US-201715494995-A
Country	US
Kind code	B2
Filing date	Apr 24, 2017
Priority date	Apr 25, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

We disclose the use of an aliphatic tertiary amino functional compound to suppress H2S formation of a sulfur-based corrosion inhibitor during storage of the sulfur-based corrosion inhibitor in a substantially enclosed container. Thus, disclosed herein is a stabilized corrosion inhibitor composition comprising a sulfur-based corrosion inhibitor and an aliphatic tertiary amino functional compound. Also disclosed herein is a method of storing a corrosion inhibitor composition by combining a sulfur-based corrosion inhibitor and an aliphatic tertiary amino functional compound to form a stabilized corrosion inhibitor composition; and storing the stabilized corrosion inhibitor composition in a substantially enclosed container for a storage period, wherein substantially no H2S is formed within the container during the storage period.

First claim

What is claimed:

1. A stabilized corrosion inhibitor composition consisting of:
about 5 wt % to 20 wt % of one or more sulfur-based corrosion inhibitors selected from mercaptoethanol and thioglycolic acid;
hexamethylenetetramine in a weight ratio of 10:1 to 1:1 of the sulfur-based corrosion inhibitor to hexamethylenetetramine;
optionally one or more equilibrium products of hexamethylenetetramine; and
a solvent.

2. The stabilized corrosion inhibitor composition of claim 1 wherein the solvent comprises water or a water-miscible solvent.

3. The stabilized corrosion inhibitor composition of claim 1 wherein the equilibrium product of hexamethylenetetramine comprises formaldehyde and ammonia.

4. A substantially enclosed container comprising the stabilized corrosion inhibitor composition of claim 1 .

5. The substantially enclosed container of claim 4 , wherein the container comprises a temperature of about 0 ° C. to 60 ° C.

6. The substantially enclosed container of claim 4 , wherein the container comprises the stabilized corrosion inhibitor composition for a period of about 1 day to 2 years.

7. A method of storing a sulfur-based corrosion inhibitor, the method comprising
combining 5 wt % to 20 wt % of one or more sulfur-based corrosion inhibitors with hexamethylenetetramine to form a stabilized corrosion inhibitor composition, wherein the one or more sulfur-based corrosion inhibitors are selected from mercaptoethanol and thioglycolic acid, the weight ratio of the sulfur-based corrosion inhibitor to hexamethylenetetramine is about 10:1 to 1:1, and wherein the stabilized corrosion inhibitor composition consists of the one or more sulfur-based corrosion inhibitors, hexamethylenetetramine, optionally one or more equilibrium products of hexamethylene tetramine, and a solvent;
storing the stabilized corrosion inhibitor composition in a substantially enclosed container for about 1 day to 2 years wherein the temperature during the storing is between about 0° C. and 60° C., further wherein substantially no H 2 S is formed within the container during the storing.

8. The method of claim 7 further comprising applying the stabilized corrosion inhibitor composition to one or more water sources contacting a metal containment.

9. The method of claim 8 wherein the water source is produced water or recycled produced water.

10. The method of claim 8 wherein the metal containment comprises carbon steel.

11. The method of claim 7 wherein the concentration of the one or more sulfur-based corrosion inhibitors in the stabilized corrosion inhibitor composition is substantially the same before and after the storing.

12. The method of claim 7 further comprising opening and reclosing the container one or more times during the storing.

Assignees

• Ecolab Usa Inc

Inventors

• Moloney Jeremy
• Anantaneni Prakasa

Classifications

• C09K2208/32

  Anticorrosion additives · CPC title

• C23F11/16

  Sulfur-containing compounds · CPC title

• C23F11/10

  using organic inhibitors · CPC title

• C09K8/54 Primary

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title