Corrosion inhibiting compositions including bis-imidazoline compounds derived from enriched linear tetramines

Patent metadata

Field	Value
Publication number	US-10329672-B2
Application number	US-201415107741-A
Country	US
Kind code	B2
Filing date	Dec 12, 2014
Priority date	Dec 27, 2013
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

The present invention provides corrosion inhibiting compositions that incorporate at least one bis-imidazoline compound. In the practice of the present invention, a tetramine admixture enriched with respect to linear tetramine is used to prepare the bis-imidazoline compound. “Enriched” means at least 70 weight percent and up to 100% of the tetramine species included in the admixture includes a linear tetramine such as L-TETA.

First claim

What is claimed is:

1. A method of inhibiting corrosion of a substrate comprising a ferrous metal, the method comprising a step of contacting the ferrous metal with composition comprising a bis-imidazoline compound and at least one nonionic surfactant, and wherein the bis-imidazoline compound has the following structure:

wherein:
each Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , and Z 6 independently is H; a hydrocarbyl of 1 to 10 carbon atoms; and/or at least first and second of the Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , and Z 6 moieties are linked to each other in a manner effective to form a divalent moiety that attaches to the corresponding imidazoline ring(s) at two attachment sites; and
each R H independently is a hydrophobic, aliphatic, monovalent moiety comprising 6 to 50 carbon atoms.

2. The method of claim 1 , wherein the nonionic surfactant comprises (a) one or more hydrophilic polyalkylene oxide chains containing on average 2 to 100 alkylene oxide repeating units, and (b) one or more aromatic hydrophobic moieties.

3. The method of claim 1 , wherein the nonionic surfactant has the structure

wherein R H is one or more hydrophobic, aliphatic moieties; R′ is a divalent alkylene moiety of 1 to 6 carbon atoms; and n is 2 to 100 on average.

4. The method of claim 1 , wherein the nonionic surfactant is derived from one or more seed oils.

5. The method of claim 1 , wherein the nonionic surfactant comprises one or more hydrophobic, branched, secondary alcohols that are functionalized with one or more hydrophilic alkylene oxide chains.

6. The method of claim 1 , wherein each Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , and Z 6 is H.

7. The method of claim 1 , wherein R H is unsaturated.

8. The method of claim 1 , wherein the bis-imidazoline compound has the structure

9. The method of claim 1 , wherein the bis-imidazoline compound is formed from a linear tetramine that is L-TETA.

10. The method of claim 1 , wherein the bis-imidazoline compound is formed from at least one linear tetramine, and at least 95 weight percent of the at least one tetramine comprises the linear tetramine.

11. The method of claim 1 , wherein the composition comprises amounts of nonionic surfactant and bis-imidazoline compound of 0.01 to 100 parts by weight of nonionic surfactant per 0.01 to 100 parts by weight of bis-imidazoline compound(s).

12. The method of claim 11 , wherein the composition comprises an amount of nonionic surfactant in the range of 1 to 10 parts per 1 part of bis-imidazoline compound.

13. The method of claim 1 , wherein the composition comprises an amount of bis-imidazoline compound in the range of 1 ppm to 100 ppm.

14. The method of claim 1 , wherein the composition comprises an amount of bis-imidazoline compound of less than 10 ppm.

15. The method of claim 1 , wherein the composition comprises an amount of bis-imidazoline compound of up to 5 ppm.

16. The method of claim 1 , wherein the composition comprises an amount of bis-imidazoline compound of up to 3 ppm.

17. The method of claim 1 , wherein the composition comprises an amount of nonionic surfactant of up to 100 ppm.

18. The method of claim 1 , wherein the composition comprises an amount of nonionic surfactant of up to 50 ppm.

Assignees

• Dow Global Technologies Llc

Inventors

• Gulabani Ritesh
• King Stephen W
• Tatake Prashant

Classifications

• C09D5/086

  Organic or non-macromolecular compounds · CPC title

• C07D233/10

  with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring nitrogen atoms · CPC title

• C07D233/16

  Radicals substituted by nitrogen atoms · CPC title

• C09K8/54

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

• C09K8/74

  combined with additives added for specific purposes · CPC title