Generation and delivery device for ozone gas and ozone dissolved in water

• US 6,746,580 B2
• Filed: 10/17/2001
• Issued: 06/08/2004
• Est. Priority Date: 01/05/1998
• Status: Expired due to Fees

• Current Assignee: Lynntech International, Ltd.
• Original Assignee: Lynntech International, Ltd.
• Inventors: Murphy, Oliver J., Andrews, Craig C.
• Primary Examiner(s): Phasge, Arun S.
• Application Number:
  US09/981,670
• Publication Number:
  US 20020070123A1
• Time in Patent Office: 965 Days
• Field of Search: 204/253, 204/254, 204/263, 204/268
• US Class Current: 204/253
• CPC Class Codes: C01B 13/10 Preparation of ozone
• CPC Class Codes: C02F 1/46104 Devices therefor; Their operating or servicing
• CPC Class Codes: C02F 1/46109 Electrodes
• CPC Class Codes: C02F 1/4672 by electrooxydation
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2001/46128 Bipolar electrodes
• CPC Class Codes: C02F 2001/46142 Catalytic coating
• CPC Class Codes: C02F 2001/46157 Perforated or foraminous electrodes
• CPC Class Codes: C02F 2201/46115 Electrolytic cell with membranes or diaphragms
• CPC Class Codes: C02F 2201/4612 Controlling or monitoring
• CPC Class Codes: C02F 2201/46155 Heating or cooling
• CPC Class Codes: C02F 2201/4616 Power supply
• CPC Class Codes: C02F 2201/4617 DC only
• CPC Class Codes: C02F 2209/02 Temperature
• CPC Class Codes: C02F 2209/42 Liquid level
• CPC Class Codes: C02F 2303/18 Removal of treatment agents after treatment
• CPC Class Codes: C25B 1/13 Ozone
• CPC Class Codes: C25B 9/23 comprising ion-exchange membranes in or on which electrode material is embedded

Abstract

The present invention provides an ozone generation and delivery system that lends itself to small scale applications and requires very low maintenance. The system preferably includes an anode reservoir and a cathode phase separator each having a hydrophobic membrane to allow phase separation of produced gases from water. The hydrogen gas, ozone gas and water containing ozone may be delivered under pressure.

Claims

1. An electrochemical cell, comprising:

(a) a compressible electrode;

(b) a rigid electrode; and

(c) a proton exchange membrane compressed between the compressible electrode and the rigid electrode, wherein the compressible electrode may compress during assembly of the electrochemical cell.

2. The electrochemical cell of claim 1, wherein the compressible electrode and rigid electrodes contain a fluid, and wherein the fluid in the compressible electrode is under greater pressure than the fluid in the rigid electrode.

3. The electrochemical cell of claim 1, further comprising a rigid support member behind the compressible electrode reducing the compression on the compressible electrode.

4. The electrochemical cell of claim 1, wherein the compressible electrode is a cathode.

5. The electrochemical cell of claim 1, wherein the compressible electrode is a cathode having a cathode flowfield, the cathode flowfield comprising stainless steel felt, at least two sheets of rolled expanded stainless steel, and a rigid perforated stainless steel sheet disposed between the felt and the expanded stainless steel.

6. The electrochemical cell of claim 5, wherein the perforated stainless steel sheet has holes therethrough which are larger than the passages in the felt and smaller than the openings in the expanded stainless steel.

7. The electrochemical cell of claim 5, wherein the perforated stainless steel sheet provides support for the stainless steel felt.

8. The electrochemical cell of claim 5, wherein the perforated stainless steel sheet prevents the rolled stainless steel sheet from damaging the stainless steel felt.

9. The electrochemical cell of claim 1, wherein the proton exchange membrane is a perfluorinated sulfonic acid polymer sheet.

10. The electrochemical cell of claim 1, wherein the proton exchange membrane is in intimate contact between an anode catalyst and a cathode catalyst.

11. The electrochemical cell of claim 1, wherein the compressible electrode comprises a felt.

12. The electrochemical cell of claim 11, wherein the felt is a metal felt.

13. The electrochemical cell of claim 12, wherein the felt is selected from stainless steel felt, titanium felt, and combinations thereof.

14. The electrochemical cell of claim 11, wherein the compressible electrode is used on a high pressure side of the electrochemical cell.

15. The electrochemical cell of claim 1, wherein oxygen gas is produced at one of the electrodes.

16. The electrochemical cell of claim 1, further comprising:

a frame securing the compressible electrode and a flowfield together in a common assembly.

17. The electrochemical cell of claim 16, wherein the frame prevents slippage or rubbing between the compressible electrode and the flowfield.

18. The electrochemical cell of claim 1, further comprising:

a frame securing the rigid electrode and a flowfield together in a common assembly.

19. The electrochemical cell of claim 15, wherein the frame prevents slippage or rubbing between the rigid electrode and the flowfield.

20. The electrochemical cell of claim 1, wherein the rigid electrode is a frit.

21. An apparatus comprising:

a plurality of electrochemical cells, each electrochemical cell comprising a compressible electrode, a rigid electrode, and a proton exchange membrane compressed between the compressible electrode and the rigid electrode, wherein the compressible electrode may compress during assembly of each electrochemical cell; and

a bipolar plate disposed between each electrochemical cell.

22. The apparatus of claim 21, wherein the bipolar plate is corrugated.

23. The apparatus of claim 22, wherein the corrugated bipolar plate provides a flowfield on both sides of the plate.

24. The electrochemical cell of claim 23, further comprising:

two endplates drawn together to compress each of the plurality of electrochemical cells and each bipolar plate.

25. The electrochemical cell of claim 24, wherein the electrochemical cells are sufficiently compressed to provide a sealing engagement.

26. The apparatus of claim 21, wherein the bipolar plate is textured.