Peroxycarboxylic acid compositions suitable for inline optical or conductivity monitoring

• US 10,031,081 B2
• Filed: 05/15/2017
• Issued: 07/24/2018
• 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, McSherry, David D., Brewster, Allison, Staub, Richard
• Primary Examiner(s): Puttlitz, Karl J
• Application Number:
  US15/595,528
• Publication Number:
  US 20170248522A1
• Time in Patent Office: 435 Days
• Field of Search: None
• CPC Class Codes: A01N 25/16 Foams
• 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
• CPC Class Codes: A01N 59/02 Sulfur; Selenium; Tellurium; Compounds thereof
• CPC Class Codes: G01N 2021/6439 with indicators, stains, dyes, tags, labels, marks
• CPC Class Codes: G01N 21/01 Arrangements or apparatus for facilitating the optical investigation
• CPC Class Codes: G01N 21/64 Fluorescence; Phosphorescence
• CPC Class Codes: G01N 21/643 non-biological material
• CPC Class Codes: G01N 21/6486 Measuring fluorescence of biological material, e.g. DNA, RNA, cells G01N21/6428 takes precedence
• CPC Class Codes: Y10T 436/206664 Ozone or peroxide

Abstract

Peracid stable fluorescent active compounds in highly acidic, equilibrium peroxycarboxylic acid sanitizing compositions are disclosed as having improved fluorescent stability allowing for monitoring of peroxycarboxylic acid concentration by conductivity and/or optical sensors. Beneficially, the compositions are also low odor and low/no VOC dual functioning acid wash and sanitizing compositions.

Claims

1. An equilibrium peracid composition comprising:

from about 1 wt-% to about 30 wt-% of at least one C₂-C₁₈ carboxylic acid;

from about 1 wt-% to about 50 wt-% hydrogen peroxide; and

from about 0.1 wt-% to about 1 wt-% of an aryl sulfonate fluorescent active compound, wherein the fluorescent active compound is sodium xylene sulfonate; and

wherein the fluorescent active compound is stable in the equilibrium peracid composition for monitoring peroxycarboxylic acid concentration by an optical sensor;

further comprising a C₁-C₂₂ peroxycarboxylic acid, wherein the C₁-C₂₂ peroxycarboxylic acid comprises from about 1 wt-% to about 40 wt-%.

2. The composition of claim 1, further comprising at least one additional agent selected from the group consisting of an acidulant, a hydrotrope, a solvent, a stabilizing agent, an anionic surfactant, a metal salt defoaming agent, and combinations thereof.

3. The composition of claim 1, wherein the C₁-C₂₂ peroxycarboxylic acid is a C₂-C₂₀ peroxycarboxylic acid.

4. The composition of claim 3, 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 combinations of the same.

5. The composition of claim 1, wherein the pH of the use solution is below about 4.

6. The composition of claim 1, further comprising an alkaline metal defoaming agent, an anionic surfactant, and a peroxycarboxylic acid stabilizing agent, wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):

7. The composition of claim 1, further comprising an additional C₂-C₁₈ carboxylic acid.

8. An equilibrium peracid composition comprising:

from about 1 wt-% to about 20 wt-% of at least one C₂-C₁₈ carboxylic acid;

from about 1 wt-% to about 50 wt-% hydrogen peroxide;

from about 0.1 wt-% to about 1 wt-% of an aryl sulfonate fluorescent active compound, wherein the fluorescent active compound is

sodium xylene sulfonate; and

wherein the fluorescent active compound is stable in the equilibrium peracid composition for monitoring peroxycarboxylic acid concentration by an optical sensor;

a mineral acid; and

a surfactant;

further comprising a C₁-C₂₂ peroxycarboxylic acid, wherein the C₁-C₂₂ peroxycarboxylic acid comprises from about 1 wt-% to about 40 wt-%.

9. The composition of claim 8, further comprising at least one additional agent selected from the group consisting of an acidulant, a hydrotrope, a solvent, a stabilizing agent, an anionic surfactant, a metal salt defoaming agent, and combinations thereof.

10. The composition of claim 8, wherein the mineral acid is sulfuric acid, hydrogen sulfate, nitric acid, sulfamic acid and sulfonic acid both alkyl and aryl, or phosphonic acid.

11. The composition of claim 8, wherein the surfactant is a nonionic surfactant, anionic surfactant, and combinations thereof.

12. The composition of claim 11, wherein the surfactant is a low-foaming anionic surfactant.

13. The composition of claim 8, 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 combinations of the same.

14. The composition of claim 8, wherein the pH of the use solution is below about 4.

15. The composition of claim 8, further comprising an alkaline metal defoaming agent, an anionic surfactant, and a peroxycarboxylic acid stabilizing agent, wherein the stabilizing agent is a picolinic acid or a compound having the following Formula (IA):