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

Patent metadata

Field	Value
Publication number	US-10827751-B2
Application number	US-201916269820-A
Country	US
Kind code	B2
Filing date	Feb 7, 2019
Priority date	Dec 29, 2010
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

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 temperature controlled adjustable biocide formulator or generator system for on-site peroxycarboxylic acid forming composition generation comprising:
an apparatus for producing a peroxycarboxylic acid forming composition that is insensitive to environmental temperatures of the location of the apparatus and/or one or more reagents, comprising a reaction vessel and/or reaction manifold, a series of feed pumps, an outlet for dosing the peroxycarboxylic acid forming composition from said reaction vessel and/or reaction manifold, and a controller for a user- or system-inputted selection device;
a temperature controlled mechanism for maintaining a controlled temperature of said reaction vessel and/or reaction manifold and/or the one or more reagents, wherein said reagents comprise at least one ester of a polyhydric alcohol and a C1 to C18 carboxylic acid, a source of alkalinity, and an oxidizing agent, at an alkaline pH; and
wherein the peroxycarboxylic acid forming composition is produced without an acid catalyst.

2. The system according to claim 1 , wherein said controlled temperature is maintained between about 4.4° C. to about 60° C.

3. The system 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 system according to claim 1 , further comprising at least one measurement device, wherein said measurement device measures one or more reaction kinetics or system operations for said peroxycarboxylic acid forming composition generation selected from the group consisting of fluorescence, weight, flow, capacitive level, pH, oxidation reduction potential, pressure, temperature and combinations thereof.

5. The system according to claim 1 , wherein the peroxycarboxylic acid forming composition reaction goes to completion within less than about 30 minutes and maintains a peracid concentration within about 10% of its final completion concentration for at least about 1 minute.

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

7. The system 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 the one or more reagents within the reaction vessel and/or reaction manifold, or the preheating of the one or more reagents is water.

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

9. The system according to claim 8 , further comprising 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 forming 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 system according to claim 1 , further comprising a control software for operating said apparatus to generate a user- or system-inputted peroxycarboxylic acid forming composition and desired volume of said peroxycarboxylic acid forming composition for on-site generation, and wherein said control software determines the timing of feeding said raw materials to said reaction vessel and/or reaction manifold, mixing and reaction time required for production of said user- or system-inputted peroxycarboxylic acid forming composition and desired volume.

11. The system according to claim 1 , further comprising a data output means for sharing information related to said peroxycarboxylic acid forming composition formulation, peroxycarboxylic acid forming composition consumption or usage, additional peroxycarboxylic acid forming composition production-related data or combinations of the same.

12. The system according to claim 1 , wherein said feed pumps are in fluid connection with said reaction vessel and/or reaction manifold and supply one or more reagents to produce said peroxycarboxylic acid forming composition in said reaction vessel and/or reaction manifold.

13. The system according to claim 1 , wherein said reaction vessel and/or reaction manifold is in fluid connection with said outlet to dispense said peroxycarboxylic acid forming composition.

14. The system according to claim 2 , wherein said controlled temperature is adjusted to between about 21° C. to about 49° C.

Assignees

• Ecolab Usa Inc

Inventors

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

Classifications

• C02F2103/08

  Seawater, e.g. for desalination · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title

• C07C407/00

  Preparation of peroxy compounds · CPC title

• A01N59/00

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

• B01J4/008

  Feed or outlet control devices · CPC title