Water temperature as a means of controlling kinetics of onsite generated peracids

Patent metadata

Field	Value
Publication number	US-10244751-B2
Application number	US-201815933161-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Dec 29, 2010
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Methods and systems for temperature-controlled, on-site generation of peracids, namely peroxycarboxylic acids and peroxycarboxylic acid forming compositions are disclosed. In particular, methods for using an adjustable biocide formulator or generator system overcome the limitations of temperature on the kinetics of the peracid generation and/or peracid decomposition inside an adjustable biocide formulator or generator system. The methods include the controlling of the temperature of at least one raw starting material, namely water, to improve upon methods of on-site generation of peracids. The methods allow for the generation of user-selected chemistry without regard to the ambient temperatures of the raw starting materials and/or the biocide formulator or generator system.

First claim

The invention claimed is:

1. A method of cleaning using an on-site generated peroxycarboxylic acid composition comprising:
obtaining a peroxycarboxylic acid composition formed on-site using an adjustable biocide formulator or generator system; and
applying said peroxycarboxylic acid composition to sanitize, bleach and/or disinfect a surface in need thereof,
wherein the adjustable biocide formulator or generator system comprises:
a perhydrolysis reaction between an ester of a polyhydric alcohol and a C 1 to C 18 carboxylic acid, a source of alkalinity and an oxidizing agent to form the peroxycarboxylic acid composition;
an apparatus for producing the peroxycarboxylic acid composition that is insensitive to environmental temperatures of the location of the apparatus and/or one or more reagents of the perhydrolysis reaction comprising a reaction vessel and/or reaction manifold, a series of feed pumps, an outlet for dosing the peroxycarboxylic acid composition from said reaction vessel and a controller for a user- or system-inputted selection device; and
a temperature controlled mechanism for maintaining a controlled temperature of said reaction vessel and/or reaction manifold and/or one or more reagents to a temperature between about 4.4° C. to about 60° C.,
wherein said feed pumps are in fluid connection with said reaction vessel and/or reaction manifold and supply the one or more reagents to produce said peroxycarboxylic acid composition in said reaction vessel and/or reaction manifold;
wherein the said peroxycarboxylic acid composition is free of acid catalyst for the perhydrolysis reaction; and
wherein said reaction vessel and/or reaction manifold is in fluid connection with said outlet to dispense said peroxycarboxylic acid composition.

2. The method according to claim 1 , wherein said temperature is adjusted to between about 21° C. to about 49° C.

3. The method according to claim 1 , wherein the source of alkalinity is sodium hydroxide, and wherein said sodium hydroxide is provided to said reaction vessel and/or reaction manifold prior to the addition of said ester in a diluted solution.

4. The method according to claim 1 , wherein the adjustable biocide formulator or generator system comprises at least one measurement device, wherein said measurement device measures one or more reaction kinetics or system operation parameters of fluorescence, weight, flow, capacitive level, pH, oxidation reduction potential, pressure, temperature and combinations thereof.

5. The method according to claim 1 , wherein said reaction goes to completion within less than about 30 minutes.

6. The method according to claim 1 , wherein said temperature control mechanism is an external heating or cooling of said reaction vessel and/or reaction manifold, internal heating of the one or more reagents within said reaction vessel and/or reaction manifold, preheating said one or more reagents, or combinations of the same.

7. The method according to claim 6 , wherein said reaction vessel and/or reaction manifold is a flow through reactor or a batch reactor and the internal heating of said one or more reagents within said reaction vessel and/or reaction manifold or the preheating said one or more reagents is heating of water.

8. The method according to claim 1 , wherein said adjustable biocide formulator or generator system further comprises a reservoir in fluid connection with said reaction vessel and/or reaction manifold outlet to mix or store said peroxycarboxylic acid compositions from said reaction vessel and/or reaction manifold.

9. The method according to claim 8 , wherein said adjustable biocide formulator or generator system further comprises an additional feed pump providing an acid or acidic aqueous solution in fluid communication with said reservoir, wherein said acid or acidic aqueous solution dilutes said peroxycarboxylic acid composition to form a peroxycarboxylic acid having a pH of about 0.1 to about 8.0, wherein the neutralization with the acid or aqueous acidic solution takes place when the concentration of the peroxycarboxylic acid is within about 10% of its final concentration.

10. The method according to claim 1 , wherein said adjustable biocide formulator or generator system further comprises a control software for operating said apparatus, and wherein said control software determines the timing of feeding said one or more reagents to said reaction vessel and/or reaction manifold, mixing and reaction time required for production of said peroxycarboxylic acid composition with a desired volume and concentration inputted by a user.

11. The method according to claim 1 , wherein said adjustable biocide formulator or generator system further comprises a data output means for sharing information related to said peroxycarboxylic acid composition, peroxycarboxylic acid composition consumption or usage, additional peroxycarboxylic acid composition production-related data or combinations of the same.

12. The method according to claim 1 , wherein said surface is a hard or soft surface.

13. The method according to claim 1 , wherein said surface is a ceramic, metal, glass, wood or hard plastic surface.

14. The method according to claim 1 , wherein said surface is a surface of architecture, eating utensil, medical or surgical instrument or device, or package.

15. The method according to claim 1 , wherein said surface is a food processing surface.

16. The method according to claim 15 , wherein said food processing surface is a surface of a food processing or preparation equipment, food processing or serving ware.

17. The method according to claim 1 , wherein said surface is a floor, wall, or fixture of a structure in which food processing occurs.

18. The method according to claim 1 , wherein said surface is a surface of an egg, meat, seed, leaf, fruit or vegetable.

19. The method according to claim 1 , wherein said applying is spraying, immersing, foam or gel treating, or wiping the composition on the surface or a combination thereof.

Assignees

• Ecolab Usa Inc

Inventors

• Herdt Brandon
• Staub Richard
• Rustad Thomas C
• Li Junzhong
• Mcsherry David D
• Kraus Paul R
• Walsh Richard

Classifications

• B01J2219/00049

  Controlling or regulating processes · CPC title

• A61L2/24

  Apparatus using programmed or automatic operation · CPC title

• A01N37/16 Primary

  containing the group [IMAGE cpc-sch-A01N-0934.gif]; Thio analogues thereof · CPC title

• B01J2219/00121

  by direct heating or cooling · CPC title

• A01N59/00

  Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds · CPC title