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

Patent metadata

Field	Value
Publication number	US-10010075-B2
Application number	US-201414562960-A
Country	US
Kind code	B2
Filing date	Dec 8, 2014
Priority date	Dec 29, 2010
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

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:
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 a 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 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; 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 system according to claim 1 , wherein said temperature is adjusted to between about 21° C. to about 49° 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 operation parameters of fluorescence, weight, flow, capacitive level, pH, oxidation reduction potential, pressure, temperature and combinations thereof.

5. The system according to claim 1 , wherein the 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 the one or more reagents within the reaction vessel and/or reaction manifold, preheating the one or more 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 the one or more reagents is heating of 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 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 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, 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 system according to claim 1 , further comprising 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.

Assignees

• Ecolab Usa Inc

Inventors

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

Classifications

• B01J2219/00121

  by direct heating or cooling · CPC title

• C07C409/24

  the —O—O— group being bound between a >C=O group and hydrogen, i.e. peroxy acids · CPC title

• A61L2/18

  Liquid substances · CPC title

• B01J2219/00159

  controlling multiple zones along the direction of flow, e.g. pre-heating and after-cooling · CPC title

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title