Methods and systems for detecting and quantifying peroxyacid and peroxide in fluids

Patent metadata

Field	Value
Publication number	US-2018024103-A1
Application number	US-201715653895-A
Country	US
Kind code	A1
Filing date	Jul 19, 2017
Priority date	Jul 19, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

Methods and systems are disclosed for analyzing and treating a fluid containing a peroxyacid and/or peroxide. A method of analyzing the fluid includes introducing into the fluid a decomposition agent that catalyzes decomposition of the peroxyacid and/or peroxide into decomposition products including oxygen, then directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent, and determining an amount of the peroxyacid and/or peroxide present in the fluid. The amount of peroxyacid and/or peroxide in the fluid can also be monitored and controlled by further adjusting the amount of the peroxyacid and/or peroxide in the fluid based on the determined amount thereof. A system for performing the methods includes a decomposition agent infusion device for introducing the decomposition agent into a fluid sample, and a sensor for directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent.

First claim

What is claimed is:

1 . A method of analyzing a fluid that includes at least one of peroxyacid and peroxide, the method comprising:
introducing into the fluid a decomposition agent that decomposes the peroxyacid and/or peroxide into decomposition products including oxygen; directly or indirectly measuring an amount of oxygen produced after the introduction of the decomposition agent; and determining an amount of the peroxyacid and/or peroxide present in the fluid based on the measured amount of oxygen.

2 . The method according to claim 1 , wherein, in the measuring step, an amount of dissolved oxygen produced in the fluid after the introduction of the decomposition agent is directly measured.

3 . The method according to claim 2 , further comprising directly measuring an amount of dissolved oxygen in the fluid before introducing the decomposition agent into the fluid.

4 . The method according to claim 1 , wherein the fluid has been treated such that it is substantially free of peroxide and is in a gaseous phase before the introduction of the decomposition agent.

5 . The method according to claim 4 , wherein, in the measuring step, an amount of oxygen produced in the gaseous fluid after the introduction of the decomposition agent is directly measured.

6 . The method according to claim 1 , wherein, in the measuring step, the amount of oxygen produced is indirectly measured by measuring a change in pressure in a system containing the fluid after the introduction of the decomposition agent.

7 . The method according to claim 1 , wherein the peroxyacid is peracetic acid.

8 . The method according to claim 1 , wherein the decomposition agent is selected from the group consisting of catalase, sodium hypochlorite, metal catalyst, alkaline solution, haloamine, and ultraviolet light.

9 . The method according to claim 1 , further comprising adjusting the pH of the fluid to be in a range of from 6.5 to 11.5.

10 . The method according to claim 1 , wherein the measuring step is performed after partial decomposition of the peroxyacid and/or peroxide in the fluid.

11 . A method of monitoring and controlling an amount of peroxyacid and/or peroxide in a fluid, the method comprising:
introducing into a sample of the fluid a decomposition agent that decomposes the peroxyacid and/or peroxide into decomposition products including oxygen; directly or indirectly measuring an amount of oxygen produced after the introduction of the decomposition agent; determining an amount of the peroxyacid and/or peroxide present in the fluid based on the measured amount of oxygen; and adjusting the amount of the peroxyacid and/or peroxide in the fluid based on the determined amount thereof.

12 . The method according to claim 11 , wherein, in the adjusting step, the amount of the peroxyacid and/or peroxide in the fluid is adjusted to be within a predetermined range.

13 . The method according to claim 11 , wherein, in the adjusting step, the amount of the peroxyacid and/or peroxide in the fluid is adjusted by adding more of the peroxyacid and/or peroxide into the fluid to increase the amount thereof in the fluid.

14 . The method according to claim 11 , wherein, in the adjusting step, the amount of peroxyacid and/or peroxide in the fluid is adjusted by introducing a neutralization agent into the fluid to decrease the amount of the peroxyacid and/or peroxide in the fluid.

15 . The method according to claim 14 , wherein the neutralizing agent is selected from the group consisting of bisulfate, erythorbate, cerium (III), catalase, sodium hypochlorite, metal catalyst, alkaline solution, haloamine, and ultraviolet light.

16 . A system for analyzing and treating a fluid containing at least one of peroxyacid and peroxide, the system comprising:
a sample collector configured to collect a sample of the fluid; a decomposition agent infusion device configured to introduce into the sample a decomposition agent that decomposes the peroxyacid and/or peroxide into decomposition products including oxygen; and a sensor configured to directly or indirectly measure an amount of oxygen produced after introduction of the decomposition agent into the sample.

17 . The system according to claim 16 , further comprising a controller that is configured to:
determine an amount of the peroxyacid and/or peroxide in the fluid based on the measured amount of oxygen; and control an amount of peroxyacid and/or peroxide, or an amount of a neutralization agent, that is introduced into the fluid based on the determined amount of the peroxyacid and/or peroxide in the fluid.

18 . The system according to claim 16 , wherein the sensor is an oxygen sensor that is configured to directly measure an amount of dissolved oxygen produced in the fluid sample after introduction of the decomposition agent into the sample.

19 . The system according to claim 16 , wherein the sensor is a pressure sensor that is configured to indirectly measure the amount of oxygen produced by measuring a change in pressure in a closed system containing the sample after introduction of the decomposition agent into the sample.

20 . The system according to claim 16 , further comprising a neutralization agent infusion device configured to introduce a neutralization agent into the fluid.

Assignees

• Chemtreat Inc

Inventors

• Richardson John
• Puchovich Mark
• Niemaseck Benjamin
• White Kevin
• Wilkins James
• Bedinger Robert

Classifications

• G01N31/225

  for oxygen, e.g. including dissolved oxygen · CPC title

• B01L3/502

  with fluid transport, e.g. in multi-compartment structures · CPC title

• C12Y111/01006 Primary

  Catalase (1.11.1.6) · CPC title

• B01L2300/0627

  Sensor or part of a sensor is integrated · CPC title

• B01L2200/16

  Reagents, handling or storing thereof · CPC title