Defoamer useful in a peracid composition with anionic surfactants

1. A low-foaming equilibrium peracid composition consisting of:

from about 1 wt. % to about 20 wt. % of peroxyacetic acid and peroxyoctanoic acid;

from about 1 wt. % to about 50 wt. % of acetic acid and octanoic acid;

from about 15 wt. % to about 50 wt. % of hydrogen peroxide;

from about 5 wt. % to about 20 wt. % of a mineral acid;

from about 1 wt. % to about 20 wt. % of an anionic surfactant, wherein the anionic surfactant is sodium xylene sulfonate, sodium cumene sulfonate, sodium octane sulfonate and/or a sulfonated fatty acid;

from about 0.01 wt. % to about 10 wt. % of a stabilizing agent;

from about 0.1 wt. % to about 5 wt. % of a metal salt defoaming agent, wherein the metal salt defoaming agent is an aluminum, magnesium, calcium, zinc, and/or a salt of a rare earth metal; and

optionally a hydrotrope, a solvent, a fluorescent active agent, or a combination thereof;

wherein the hydrotrope aids in solubilization of the stabilizing agent; wherein the solvent aids in solubilization of the composition to form a solution;

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

wherein the composition is provided as one or more individual reagents configured to be combined in situ.

2. The composition of claim 1 , further consisting of a hydrotrope, a solvent, a fluorescent active agent, or a combination thereof.

3. The composition of claim 1 , wherein the defoaming agent is aluminum sulfate.

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

5. The composition of claim 1 , wherein the defoaming agent is aluminum sulfate and the anionic surfactant is sodium octane sulfonate and/or a sulfonated fatty acid.

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

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 ) alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 ) alkyl; wherein each R 3 is independently (C 1 -C 6 ) alkyl, (C 2 -C 6 ) alkenyl or (C 2 -C 6 ) alkynyl; and n is a number from zero to 3; or a salt thereof;

or a compound having the following Formula (IB):

wherein R 1 is OH or —NR 1a R 1b wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 ) alkyl; wherein each R 3 is independently (C 1 -C 6 ) alkyl, (C 2 -C 6 ) alkenyl or (C 2 -C 6 ) alkynyl; and n is a number from zero to 3; or a salt thereof, wherein the stabilizing agent delays or prevents the peroxycarboxylic acid from exceeding its self-accelerating decomposition temperature (SADT).

7. A low-foaming, stabilized equilibrium peracid composition consisting of:

from about 1 wt. % to about 20 wt. % of peroxyacetic acid and peroxyoctanoic acid;

from about 1 wt. % to about 50 wt. % of acetic acid and octanoic acid;

from about 15 wt. % to about 50 wt. % of hydrogen peroxide;

from about 5 wt. % to about 20 wt. % of a mineral acid;

from about 3 wt. % to about 15 wt. % of an anionic surfactant;

from about 0.1 wt. % to about 5 wt. % of a metal salt defoaming agent; and

from about 0.01 wt % to about 10 wt. % of a peroxycarboxylic acid stabilizing agent; and

optionally a hydrotrope, a solvent or combinations thereof;

wherein the hydrotrope aids in solubilization of the stabilizing agent; wherein the solvent aids in solubilization of the composition to form a solution;

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

wherein R 1 is OH or —NR 1a R 1b wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

or a compound having the following Formula (IB):

wherein R 1 is OH or —NR 1a R 1b , wherein R 1a and R 1b are independently hydrogen or (C 1 -C 6 )alkyl; wherein R 2 is OH or —NR 2a R 2b , wherein R 2a and R 2b are independently hydrogen or (C 1 -C 6 )alkyl; wherein each R 3 is independently (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl or (C 2 -C 6 )alkynyl; and n is a number from zero to 3; or a salt thereof;

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

wherein the defoaming agent and anionic surfactant provide enhanced biocidal efficacy for the composition; and

wherein the composition is provided as one or more individual reagents configured to be combined in situ.

8. The composition of claim 7 , further consisting of a hydrotrope, a solvent or combinations thereof.

9. The composition of claim 7 , wherein the defoaming agent is an aluminum salt, a magnesium salt, a calcium salt, a zinc salt and/or a salt of a rare earth metal.

10. The composition of claim 9 , wherein the defoaming agent is aluminum sulfate.

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

providing the low-foaming equilibrium peracid composition of claim 1 ; and

contacting a surface or substrate with a use solution of the composition for at least about 15 seconds to reduce a microbial population.

12. The method of claim 11 , wherein the defoaming agent is aluminum sulfate.

13. The method of claim 11 , wherein the contacting step lasts for about 1 to 5 minutes, and 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, 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.