Alkaline and chlorine solutions produced using electro-chemical activation

Patent metadata

Field	Value
Publication number	US-11326261-B2
Application number	US-201716302208-A
Country	US
Kind code	B2
Filing date	May 5, 2017
Priority date	May 17, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

An electro-chemical activation (ECA) system includes an anode chamber, a cathode chamber, and a neutralization chamber. The anode chamber includes an anode configured to convert water having an alkaline-metal chloride into an anodic electrolyte that includes hypochlorous acid. The cathode chamber includes a cathode configured to convert water into a cathodic electrolyte. The neutralization chamber includes a neutralization cathode configured to remove protons from the anodic electrolyte after it leaves the anode chamber. The ECA system is configured to recirculate the anodic electrolyte back through the anode chamber and the neutralization chamber at least one more time to produce a concentrated chlorine solution. The ECA system is further configured to recirculate the cathodic electrolyte back through the cathode chamber at least one additional time to produce a concentrated alkaline solution.

First claim

What is claimed is:

1. An electro-chemical activation (ECA) system, comprising:
a chamber cell comprising
an anode chamber comprising an anode, wherein the anode is configured to convert water having an alkaline-metal chloride into an anodic electrolyte comprising protons and hypochlorous acid;
a cathode chamber comprising a cathode, wherein the cathode is configured to convert water into a cathodic electrolyte; and
a first membrane separating the anode chamber from the cathode chamber; and

a neutralization cell separate from the chamber cell, the neutralization cell comprising
a neutralization chamber in fluid communication with the anode chamber, the neutralization chamber comprising a neutralization cathode and a neutralization anode, wherein the neutralization chamber is configured to neutralize the protons of the anodic electrolyte and increase a pH level of the anodic electrolyte from the anode chamber while increasing a concentration of the hypochlorous acid,

wherein the ECA system is configured to recirculate the anodic electrolyte back through the anode chamber and the neutralization chamber multiple times to produce a concentrated chlorine solution; and wherein the ECA system is further configured to recirculate the cathodic electrolyte back through the cathode chamber multiple times to produce a concentrated alkaline solution,
wherein the ECA system further comprises an electronic controller configured to receive an indication of the pH level of the anodic electrolyte and to control power to the cathode and the neutralization cathode based on the indication of the pH level of the anodic electrolyte so as to perform operations comprising
operating the ECA system in a production mode to generate the anodic electrolyte comprising the protons and the hypochlorous acid;
operating the ECA system in a neutralization mode to increase the pH level of the anodic electrolyte while increasing the concentration of the hypochlorous acid; and
alternating operation between the production mode and the neutralization mode.

2. The ECA system of claim 1 , further comprising:
a neutralization recirculation path configured to recirculate at least a portion of the anodic electrolyte back through the neutralization chamber.

3. An electro-chemical activation (ECA) system, comprising:
a chamber cell comprising
an anode chamber comprising an anode, wherein the anode is configured to convert water having an alkaline-metal chloride into an anodic electrolyte comprising protons and hypochlorous acid;
a cathode chamber comprising a cathode, wherein the cathode is configured to convert water into a cathodic electrolyte; and
a first membrane separating the anode chamber from the cathode chamber; and

a neutralization cell separate from the chamber cell, the neutralization cell comprising
a neutralization chamber in fluid communication with the anode chamber, the neutralization chamber comprising a neutralization cathode and a neutralization anode, wherein the neutralization chamber is configured to neutralize the protons of the anodic electrolyte and increase a pH level of the anodic electrolyte from the anode chamber while increasing a concentration of the hypochlorous acid, wherein the ECA system is configured to recirculate the anodic electrolyte back through the anode chamber and the neutralization chamber multiple times to produce a concentrated chlorine solution; and wherein the ECA system is further configured to recirculate the cathodic electrolyte back through the cathode chamber multiple times to produce a concentrated alkaline solution; and wherein the first membrane is configured to hinder the migration of between the anode chamber and the cathode chamber.

4. An electro-chemical activation (ECA) system, comprising:
a chamber cell comprising
an anode chamber comprising an anode, wherein the anode is configured to convert water having an alkaline-metal chloride into an anodic electrolyte comprising protons and hypochlorous acid;
a cathode chamber comprising a cathode, wherein the cathode is configured to convert water into a cathodic electrolyte; and
a first membrane separating the anode chamber from the cathode chamber; and

a neutralization cell separate from the chamber cell, the neutralization cell comprising
a neutralization chamber in fluid communication with the anode chamber, the neutralization chamber comprising a neutralization cathode and a neutralization anode, wherein the neutralization chamber is configured to neutralize the protons of the anodic electrolyte and increase a pH level of the anodic electrolyte from the anode chamber while increasing a concentration of the hypochlorous acid, wherein the ECA system is configured to recirculate the anodic electrolyte back through the anode chamber and the neutralization chamber multiple times to produce a concentrated chlorine solution; and wherein the ECA system is further configured to recirculate the cathodic electrolyte back through the cathode chamber multiple times to produce a concentrated alkaline solution; and wherein the cathode is located in the cathode chamber in direct contact with the first membrane.

5. The ECA system of claim 3 , wherein a ratio of exposed surface area of the neutralization anode in the neutralization chamber to exposed surface area of the neutralization cathode in the neutralization chamber is in a range from about 1:1 to about 1:10,000.

6. The ECA system of claim 3 , further comprising:
a brine chamber located in the chamber cell between the anode chamber and the cathode chamber, wherein the brine chamber and the cathode chamber are separated by the first membrane, and wherein the brine chamber and the anode chamber are separated by a second membrane.

7. The ECA system of claim 6 , wherein the second membrane is configured to permit migration of Cl − from the brine chamber to the anode chamber.

8. The ECA system of claim 7 , wherein the second membrane is further configured to hinder the migration of sodium between the brine chamber and the anode chamber.

9. The ECA system of claim 6 , wherein the ECA system is configured to cycle brine through the brine chamber.

10. The ECA system of claim 3 , further comprising:
an electronic controller configured to receive an indication of the pH level of the anodic electrolyte and further configured to control one or more of power to or activation time of the cathode and the neutralization cathode based on the indication of the pH level of the anodic electrolyte.

11. The ECA system of claim 10 , wherein the electronic controller is further configured to control one or more of recirculation of the anodic electrolyte by the ECA system, recirculation of the cathodic electrolyte by the ECA system, dispensing of the concentrated chlorine solution from the ECA system, or dispensing of the concentrated alkaline solution from the ECA system.

12. A method of using the ECA system of claim 1 , the method comprising:
adding brine to the ECA system;
adding water to the ECA system;
circulating the brine through the anode chamber and the neutralization chamber multiple times to produce the concentrated chlorine solution, wherein the concentrated chlorine solution has a pH level in a range from about pH 4 to about pH 8; and
circulating the water through the cathode chamber multiple times to produce the concentrated alkaline solution.

13. The method of claim 12 , wherein the concentrated chlorine solution has a pH level in a range from about pH 4 to about pH 6.

14. The method of claim 12 , wherein the concentrated chlorine solution has a concentration in a range from about 0.02% to about 14%.

Assignees

• Diversey Inc

Inventors

• Veening Jan E

Classifications

• C25B15/087

  Recycling of electrolyte to electrochemical cell · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title

• C25B9/21

  two or more diaphragms · CPC title

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title