Defoamer useful in a peracid composition with anionic surfactants

• US 10,165,774 B2
• Filed: 03/05/2013
• Issued: 01/01/2019
• Est. Priority Date: 03/05/2013
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Li, Junzhong, Staub, Richard, McSherry, David D.
• Primary Examiner(s): Richter, Johann R
• Assistant Examiner(s): Alley, Genevieve S
• Application Number:
  US13/785,047
• Publication Number:
  US 20140255514A1
• Time in Patent Office: 2,128 Days
• CPC Class Codes: A01N 25/30 characterised by the surfactants
• CPC Class Codes: A01N 37/02 Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
• CPC Class Codes: A01N 37/16 containing the group; Thio analogues thereof
• CPC Class Codes: A01N 41/04 Sulfonic acids; Derivatives thereof
• CPC Class Codes: A01N 59/00 Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds

Abstract

Low foaming, highly acidic peroxycarboxylic acid sanitizing compositions are disclosed as having both improved antimicrobial efficacy in comparison to conventional peroxyoctanoic acid and peroxyacetic acid compositions for sanitizing applications. The compositions include a combination of a low-foaming surfactant and an aluminum sulfate (or other metal salt) defoaming agent that is compatible with the highly acidic peroxycarboxylic acid sanitizing compositions. In particular, the sanitizing peroxycarboxylic acid compositions are also low odor and low/no VOC dual functioning acid wash and sanitizing compositions.

Claims

1. A low-foaming equilibrium peracid composition comprising:

a C₁-C₂₂ peroxycarboxylic acid;

a C₁-C₂₂ carboxylic acid;

hydrogen peroxide;

a mineral acid;

an anionic surfactant; and

from about 0.6 wt-% to about 0.75 wt-% of a metal salt defoaming agent, wherein the defoaming agent is aluminum sulfate;

wherein the composition has a use solution pH below about 4;

wherein the composition is provided as a concentrate, and wherein the composition is subsequently diluted at a ratio of between about 1;

100 and about 1;

5,000.

2. The composition of claim 1, wherein the C₁-C₂₂ peroxycarboxylic acid comprises from about 1 wt-% to about 40 wt-%, the C₁-C₂₂ carboxylic acid comprises from about 1 wt-% to about 80 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 80 wt-%, the mineral acid comprises from about 5 wt-% to about 50 wt-%, and the anionic surfactant comprises from about 0.01 wt-% to about 40 wt-%.

3. The composition of claim 1, further comprising at least one additional agent, wherein the at least one additional agent is a hydrotrope, a solvent, a stabilizing agent, a fluorescent active agent and combinations thereof.

4. The composition of claim 1, wherein the C₁-C₂₂ peroxycarboxylic acid is a C₂-C₂₀ peroxycarboxylic acid comprising from about 1 wt-% to about 20 wt-% and wherein the C₁-C₂₂ carboxylic acid is a C₂-C₂₀ carboxylic acid comprising from about 1 wt-% to about 50 wt-%.

5. The composition of claim 4, wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

6. The composition of claim 1, wherein the defoaming agent is present in a use solution in an amount from about 0.1 ppm to about 50 ppm.

7. The composition of claim 1, wherein the pH of the use solution is below about 3.

8. The composition of claim 1, wherein the anionic surfactant is sodium octane sulfonate and sulfonated oleic acid.

9. The composition of claim 1, further comprising a peroxycarboxylic acid stabilizing agent, wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

17. A method for reducing a microbial population using a low-foaming equilibrium peroxycarboxylic acid composition comprising:

providing the peroxycarboxylic acid composition of claim 1; and

contacting a surface or substrate with a use solution of the composition for at least 10 seconds, wherein the use solution has a pH below about 4.

18. The method of claim 17, wherein the C₁-C₂₂ peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid, peroxysulfonated oleic acid and combinations thereof, wherein the C₁-C₂₂ carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid and combinations thereof.

19. The method of claim 17, wherein the surface or substrate is a food item, plant item, animal item, a container, an equipment, a system or a facility for growing, holding, processing, packaging, storing, transporting, preparing, cooking or serving the food item, plant item or the animal item, an instrument, a hard surface, a liquid media, equipment, a fabric surface, a fouled water or industrial processing liquid source, liquid system, or process water used in oil, gas and/or industrial processing operations.

10. A low-foaming, stabilized equilibrium peracid composition comprising:

from about 1 wt-% to about 40 wt-% of a C₁-C₂₂ peroxycarboxylic acid;

from about 1 wt-% to about 80 wt-% of a C₁-C₂₂ carboxylic acid;

from about 1 wt-% to about 80 wt-% of hydrogen peroxide;

from about 1 wt-% to about 50 wt-% of a mineral acid;

from about 0.01 wt-% to about 40 wt-% of a low-foaming anionic surfactant;

from about 0.6 wt-% to about 0.75 wt-% of a metal salt defoaming agent, wherein the defoaming agent is aluminum sulfate; and

from about 0.01 wt-% to about 10 wt-% of a peroxycarboxylic acid stabilizing agent,

wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA);

11. The composition of claim 10, wherein the C₁-C₂₂ peroxycarboxylic acid comprises from about 1 wt-% to about 20 wt-%, the C₁-C₂₂ carboxylic acid comprises from about 1 wt-% to about 50 wt-%, the hydrogen peroxide comprises from about 1 wt-% to about 50 wt-%, the mineral acid comprises from about 1 wt-% to about 20 wt-%, the surfactant comprises from about 0.1 wt-% to about 25 wt-%, and the stabilizing agent comprises from about 0.01 wt-% to about 1 wt-%.

12. The composition of claim 11, wherein the C₁-C₂₂ peroxycarboxylic acid is a combination of peroxyoctanoic acid and peroxysulfonated oleic acid, the C₁-C₂₂ carboxylic acid is acetic acid, the mineral acid is sulfuric acid, and the stabilizing agent is dipicolinic acid.

13. The composition of claim 10, further comprising a hydrotrope, a solvent or combinations thereof, wherein the hydrotrope is sodium xylene sulfonate or sodium cumene sulfonate.

14. The composition of claim 10, wherein the C₁-C₂₂ peroxycarboxylic acid is a C₂-C₂₀ peroxycarboxylic acid and wherein the C₁-C₂₂ carboxylic acid is a C₂-C₂₀ carboxylic acid.

15. The composition of claim 14, wherein the peroxycarboxylic acid is peroxyacetic acid, peroxyoctanoic acid and/or peroxysulfonated oleic acid, and wherein the carboxylic acid is acetic acid, octanoic acid, sulfonated oleic acid or a combination of the same.

16. The composition of claim 10, wherein the aluminum sulfate is present in a use solution in an amount of from about 0.1 ppm to about 50 ppm.