Performic acid on-site generator and formulator

Patent metadata

Field	Value
Publication number	US-11737460-B2
Application number	US-202016946513-A
Country	US
Kind code	B2
Filing date	Jun 25, 2020
Priority date	Sep 4, 2015
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

Methods of generating performic acid by contacting aqueous oxidizing agent and aqueous formic acid source in liquid phase are disclosed. A system and apparatus for the in situ production of the performic acid chemistries is further disclosed. In particular, a continuous flow reactor is provided to generate performic acid at variable rates. Methods of employing the oxidizing biocide for various disinfection applications are also disclosed.

First claim

What is claimed:

1. An adjustable biocide generator system for on-site performic acid forming composition generation comprising:
an apparatus comprising at least one inlet, a length of pipe, a heating device, an outlet, and a storage reservoir for dosing a performic acid forming composition from said length of pipe;
wherein said inlet(s) are in fluid connection with said length of pipe and supply reagents to produce said performic acid forming composition in said length of pipe;
wherein said reagents comprise a formic acid source and an oxidizing agent; and
wherein said length of pipe is in fluid connection with said outlet to dispense said performic acid forming composition to a storage reservoir.

2. The system according to claim 1 , wherein said performic acid forming composition is an individual or mixed performic acid forming composition according to a user- or system-inputted selection, and wherein the mixed performic acid forming composition comprises performic acid and an additional C1-C22 percarboxylic acid.

3. The system according to claim 1 , wherein the formic acid source is formic acid, and wherein said oxidizing agent is 1-50% w/v hydrogen peroxide.

4. The system according to claim 1 , wherein the length of pipe further comprises a cooling system prior to dispensing said performic acid forming composition to the storage reservoir.

5. The system according to claim 4 , wherein the cooling system includes a quenching mode, increased surface area, cooling jacket, venting systems, cold finger, heat exchanger, refrigeration sleeve, blower, cooled vessel, or combinations thereof.

6. 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 performic acid forming composition generation.

7. The system according to claim 1 , wherein said heating device is selected from the group consisting of a cartridge, heat exchanger, heat blanket, steam jacket, solar panels, steam preheat, an electrical source and combinations thereof, and wherein said heating device maintains a temperature that does not exceed 200° C. for the reagent temperature, and wherein said length of pipe is designed to accommodate at least 5 times the pressure of the system.

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

9. The system according to claim 1 , wherein the storage reservoir comprises a cooling system to cool the performic acid forming composition.

10. The system according to claim 9 , wherein the cooling system includes a cooling jacket, venting systems, cold finger, heat exchanger, refrigeration sleeve, blower, cooled vessel or combinations thereof.

11. A method of on-site generating performic acid forming composition comprising:
providing a formic acid source to a length of pipe at a desired flow rate;
providing an oxidizing agent to said length of pipe at a desired flow rate;
contacting said formic acid source with an effective amount of said oxidizing agent within said length of pipe in the presence of a heating device to form a performic acid composition;
delivering said performic acid composition to a downstream storage reservoir, wherein said performic acid is an individual or mixed performic acid composition according to a user- or system-inputted selection,
wherein the reaction to form the performic acid composition begins generating yield instantaneously and reaches maximum yield within 10 minutes or less.

12. The method of claim 11 , wherein the formic acid source is formic acid and the oxidizing agent is hydrogen peroxide, and wherein the hydrogen peroxide and the performic acid concentration generated on-site is from 2 wt-% to about 15 wt-% and has a higher concentration to the unreacted hydrogen peroxide.

13. The method of claim 11 , wherein said storage reservoir comprises a cooling system to cool the performic acid composition.

14. The method of claim 13 , wherein the cooling system includes a cooling jacket, venting systems, cold finger, heat exchanger, refrigeration sleeve, blower, cooled vessel or combinations thereof.

15. The method of claim 11 , further comprising a cooling system for cooling said performic acid prior to the storage reservoir.

16. The method of claim 15 , wherein the cooling system includes a quenching mode, increased surface area, cooling jacket, venting systems, cold finger, heat exchanger, refrigeration sleeve, blower, cooled vessel or combinations thereof.

17. The method of claim 11 , further comprising a step of: (a) measuring variables of the reaction to form the performic acid composition, wherein the measuring step measures conductivity, temperature, product levels, concentrations, IR/UV/VIS spectroscopy, pressure, performic acid and/or oxidant concentrations, and/or flow rate; and/or (b) controlling the method using control software for operating said apparatus to generate a user- or system-inputted performic acid forming composition and said desired flow rate of said performic acid forming composition for on-site generation.

18. The method according to claim 11 , wherein the reaction reaches maximum yield within 60 seconds or less, wherein the reaction generates at least about 2% performic acid near instantaneously, the reaction generates at least about 4% performic acid within 1 minute, the reaction generates at least about 8% performic acid within 2 minutes, or the reaction generates at least 15% performic acid within 30 minutes.

19. A method of cleaning using an on-site generated performic acid composition comprising:
obtaining a user- or system-inputted performic acid composition on-site using an adjustable biocide generator system comprising:
an apparatus comprising at least one inlet, a length of pipe, a heating device, an outlet, and a storage reservoir for dosing a performic acid forming composition from said length of pipe;
wherein said inlet(s) are in fluid connection with said length of pipe and supply reagents to produce said performic acid forming composition in said length of pipe;
wherein said reagents comprise a formic acid source and an oxidizing agent and wherein said length of pipe is in fluid connection with said outlet to dispense said performic acid forming composition to a storage reservoir;
applying said performic acid composition in an amount sufficient to sanitize, bleach and/or disinfect a surface in need thereof.

20. The method of claim 19 , wherein the surface is a food item or a plant item and/or at least a portion of a medium, a container, an equipment, a membrane, a system or a facility for growing, holding, processing, packaging, storing, transporting, preparing, cooking or serving the food item or the plant item, and wherein the performic acid composition is applied to the surface by means of a spray, immersion, foam, or gel.

Assignees

• Ecolab Usa Inc

Inventors

• Kraus Paul R
• Crew Benjamin
• Li Junzhong
• Mcsherry David D
• Balasubramanian Ramakrishnan
• Staub Richard
• Kleczewski Ariel Chatman
• Tran Minh
• Hanson Catherine
• Yunus Irwan
• Breshears Jeffery D
• Brunner Brian Paul

Classifications

• A23B2/742

  Organic compounds containing oxygen · CPC title

• A23B2/729

  Organic compounds; Microorganisms; Enzymes · CPC title

• A23B2/75 Primary

  with doubly-bound oxygen · CPC title

• A01N37/36 Primary

  containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids · CPC title

• A01N37/16

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