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

Patent metadata

Field	Value
Publication number	US-11330818-B2
Application number	US-202016948917-A
Country	US
Kind code	B2
Filing date	Oct 6, 2020
Priority date	Dec 29, 2010
Publication date	May 17, 2022
Grant date	May 17, 2022

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 for peroxycarboxylic acid forming composition generation or peroxycarboxylic acid generation comprising:
inputting a user-desired or system-controlled volume or mass of a peroxycarboxylic acid forming composition or peroxycarboxylic acid into a control software for on-site generation; and
combining one or more esters of a polyhydric alcohol and a C1 to C18 carboxylic acid, a source of alkalinity and an oxidizing agent at an alkaline pH of at least about 12 in an adjustable biocide formulator or generator system, wherein said system is an apparatus that is insensitive to environmental temperatures of the location of the apparatus and/or reagents comprising a reaction vessel, a series of feed pumps, an outlet for dosing the peroxycarboxylic acid forming composition or the peroxycarboxylic acid from said reaction vessel and a controller for a user- or system-inputted selection device; and
generating the peroxycarboxylic acid forming composition or peroxycarboxylic acid without an acid catalyst;
wherein said temperature insensitivity to the environmental temperatures of the location of the apparatus and/or reagents is controlled by a mechanism for maintaining a controlled temperature of said reaction vessel and/or one or more reagents;
wherein said feed pumps are in fluid connection with said reaction vessel and supply one or more reagents to produce said peroxycarboxylic acid forming composition in said reaction vessel; and
wherein said reaction vessel is in fluid connection with said outlet to dispense said peroxycarboxylic acid forming composition or peroxycarboxylic acid.

2. The method according to claim 1 , wherein the temperature control of said reaction vessel and supply of said reagents adjusts to a temperature of between about 4.4° C. to about 60° C.

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

4. 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 prior to the addition of said ester in a diluted solution.

5. The method according to claim 1 , wherein the peroxycarboxylic acid forming composition reaction goes to completion within less than about 30 minutes.

6. The method according to claim 1 , wherein the peroxycarboxylic acid forming composition maintains a peracid concentration within about 10% of its final completion concentration for at least about 1 minute.

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

8. The method according to claim 7 , wherein said reaction vessel is a flow through reactor or a batch reactor and the heated reagent is water.

9. The method according to claim 1 , further comprising timing the addition of said esters in parallel or sequentially for reaction in said reaction manifold.

10. The method according to claim 1 , further comprising measuring the extent of said ester perhydrolysis reaction using one or more measurement devices, wherein said measurement device measures one or more reaction kinetics or system operations for said peroxycarboxylic acid generation selected from the group consisting of fluorescence, weight, flow, capacitive level, pH, oxidation reduction potential, pressure, temperature and combinations thereof, and wherein said measurement devices determine when to dilute said peroxycarboxylic acid forming composition with an acid or aqueous acidic solution to form said peroxycarboxylic acid.

11. The method according to claim 1 , further comprising providing an acid or aqueous acidic solution 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 peracid is within about 10% of its final concentration.

12. The method according to claim 1 , further comprising dispensing said peroxycarboxylic acid forming composition for use in a cleaning process, wherein said composition is dispensed from said reaction vessel when the concentration of peracid is within about 10% of its final concentration.

Assignees

• Ecolab Usa Inc

Inventors

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

Classifications

• B01J14/00

  Chemical processes in general for reacting liquids with liquids; Apparatus specially adapted therefor (B01J8/00, B01J19/08 take precedence) · CPC title

• C02F1/722

  Oxidation by peroxides · CPC title

• B01J2219/00049

  Controlling or regulating processes · CPC title

• C07C407/00

  Preparation of peroxy compounds · CPC title

• C02F1/50

  by addition or application of a germicide or by oligodynamic treatment {(C02F1/4606, C02F1/467, C02F1/76 take precedence)} · CPC title