Separation and/or sequestration apparatus and methods

• US 8,945,368 B2
• Filed: 01/23/2013
• Issued: 02/03/2015
• Est. Priority Date: 01/23/2012
• Status: Expired due to Fees

• Current Assignee: Battelle Memorial Institute
• Original Assignee: Battelle Memorial Institute
• Inventors: Rieke, Peter C., Towne, Silas A., Coffey, Greg W., Appel, Aaron M.
• Primary Examiner(s): Hendricks, Keith
• Assistant Examiner(s): Friday, Steven A.
• Application Number:
  US13/748,463
• Publication Number:
  US 20130186775A1
• Time in Patent Office: 741 Days
• Field of Search: 204/234, 204/275.1, 204/277, 204/278, 204/278.5, 205/687, 205/349, 205/555
• US Class Current: 205/555
• CPC Class Codes: B01D 19/0073 by a method not covered by groups B01D19/0005 - B01D19/0042
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/965 including an electrochemical process step
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

Apparatus for separating CO₂ from an electrolyte solution are provided. Example apparatus can include: a vessel defining an interior volume and configured to house an electrolyte solution; an input conduit in fluid communication with the interior volume; an output conduit in fluid communication with the interior volume; an exhaust conduit in fluid communication with the interior volume; and an anode located within the interior volume. Other example apparatus can include: an elongated vessel having two regions; an input conduit extending outwardly from the one region; an output conduit extending outwardly from the other region; an exhaust conduit in fluid communication with the one region; and an anode located within the one region. Methods for separating CO₂ from an electrolyte solution are provided. Example methods can include: providing a CO₂ rich electrolyte solution to a vessel containing an anode; and distributing hydrogen from the anode to acidify the electrolyte solution.

Claims

1. An apparatus for separating CO₂ from an electrolyte solution, the apparatus comprising:

a vessel defining an interior volume and configured to house an electrolyte solution;

an input conduit in fluid communication with the interior volume and configured to convey the electrolyte solution to the interior volume;

an output conduit in fluid communication with the interior volume and configured to convey the electrolyte solution outside the interior volume;

an exhaust conduit in fluid communication with the interior volume;

an anode located within the interior volume and configured to provide hydrogen ions to the electrolyte solution within the vessel; and

a cathode located within the interior volume; and

further comprising

a fluid conduit coupling the anode and the cathode, the cathode configured to provide H₂ to the fluid conduit, wherein the anode comprises a porous electrode configured to receive H₂ from the fluid conduit, and wherein the interior volume of the vessel is continuous between the cathode and the anode.

2. The apparatus of claim 1 further comprising an electron conduit between the anode and the cathode.

3. The apparatus of claim 2 wherein the cathode is located proximate the output conduit.

4. The apparatus of claim 2 wherein the cathode is configured to receive electrons from the electron conduit and generate H₂ for the fluid conduit.

5. The apparatus of claim 1 further comprising an absorber assembly in fluid communication with one or both of the input and output conduits.

6. The apparatus of claim 5 wherein the absorber assembly is configured to receive combustion gases.

7. The apparatus of claim 6 wherein the absorber assembly is configured to expose the combustion gases to the electrolyte exiting the output conduit.

8. The apparatus of claim 7 wherein the absorber assembly is configured to transfer the exposed electrolyte solution to the input conduit.

9. An apparatus for separating CO₂ from an electrolyte solution, the apparatus comprising:

an elongated vessel defining an interior volume and configured to house an electrolyte solution, the vessel having two regions, each of the two regions associated with an opposing terminal end of the vessel;

an input conduit extending outwardly from a wall of one of the two regions of the vessel and in fluid communication with the one of the two regions and configured to convey the electrolyte solution to the one region;

an output conduit extending outwardly from a wall of another of the two regions of the vessel and in fluid communication with the other of the two regions and configured to convey the electrolyte solution outside the other region;

an exhaust conduit in fluid communication with the one region;

an anode located within the one region and configured to provide hydrogen ions to the electrolyte solution within the vessel; and

a cathode located within the other region; and

further comprising

a fluid conduit coupling the anode to the cathode, the cathode configured to provide H₂ to the fluid conduit, wherein the anode comprises a porous electrode configured to receive H₂ from the fluid conduit, and wherein the interior volume of the vessel is continuous between the cathode and the anode.

10. The apparatus of claim 9 further comprising one or more pumps coupled to one or both of the input conduit and/or the output conduit.

11. The apparatus of claim 9 further comprising an absorber in fluid communication with both regions of the vessel.

12. The apparatus of claim 11 wherein the absorber and vessel are configured to cycle the electrolyte solution through the absorber and through the vessel passing through the one region before the other region.

13. The apparatus of claim 9 wherein some of the electrolyte solution in the one region is acidic and some of the electrolyte solution in the other region is basic.

14. A method for separating CO₂ from an electrolyte solution, the method comprising:

providing a CO₂ rich electrolyte solution to a vessel containing an anode;

within the vessel, distributing hydrogen ions from the anode to acidify the electrolyte solution and evolve at least some of the CO₂ from the electrolyte solution to outside the vessel;

after evolving at least some of the CO₂ from the electrolyte solution, exposing the electrolyte solution to a cathode within the vessel; and

providing H₂ from the cathode to the anode.

15. The method of claim 14 further comprising generating electrons from the anode and transferring the electrons to the cathode.

16. The method of claim 14 further comprising exposing an electrolyte solution to combustion gases to form the CO₂ rich electrolyte solution.

17. The method of claim 16 wherein the electrolyte solution is regenerated in the vessel.

18. The method of claim 17 further comprising cycling the electrolyte solution through the absorber and the vessel to absorb CO₂ from the combustion gases and evolve the CO₂ from the vessel.