METHOD AND APPARATUS FOR REMOVING AMMONIA FROM A GAS STREAM

• US 20110206588A1
• Filed: 08/11/2009
• Published: 08/25/2011
• Est. Priority Date: 08/11/2008
• Status: Abandoned Application

• Current Assignee: Kilimanjaro Energy, Inc.
• Original Assignee: Global Research Technologies, LLC
• Inventors: Lackner, Klaus S.
• Application Number:
  US13/058,802
• Publication Number:
  US 20110206588A1
• Time in Patent Office: Days
• US Class Current: 423/237
• CPC Class Codes: B01D 2253/206 Ion exchange resins
• CPC Class Codes: B01D 2257/406 Ammonia
• CPC Class Codes: B01D 2258/05 Biogas
• CPC Class Codes: B01D 2259/40092 using hot liquid
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01D 53/58 Ammonia
• CPC Class Codes: B01D 53/82 with stationary reactants
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The present disclosure provides a method for removing ammonia from a gas stream, comprising contacting the gas stream with a substrate having anions carried on a surface thereof, whereupon ammonia in the gas stream attaches to the substrate by reacting with the anions.

Claims

1. A method for removing ammonia from a gas stream, comprising

placing said gas stream in contact with substrate carrying a cationic resin, whereupon ammonia from said gas stream attaches to said substrate by reacting with said cationic resin.

2. The method as recited in claim 1, wherein said cationic resin includes hydrogen ions attached to a surface of the cationic resin.

3. The method as recited in claim 1, wherein said substrate is formed by coating said cationic resin onto a substrate material.

4. The method as recited in claim 1, wherein said substrate comprises a porous material carrying said cationic resin.

5. The method as recited in claim 1, and further including the step of subsequently releasing the ammonia from the substrate by exposing the substrate to moisture.

6. The method as recited in claim 5, wherein the substrate is subjected to liquid water.

7. The method as recited in claim 1, and further including the step of subsequently releasing the removed ammonia from the substrate by heating the substrate.

8. A method for capturing and removing ammonia from a gas stream, comprising

placing said gas stream in contact with a substrate having an exposed cationic material thereon, whereupon ammonia from said gas stream becomes attached to said substrate by reacting with the cations of said cationic material to form ammonium.

9. The method as recited in claim 8, and further including the step of releasing the captured ammonia from said substrate by washing the substrate with water.

10. The method as recited in claim 8, including the step of releasing the captured ammonia from said substrate by exposing the substrate to humidity.

11. The method as recited in claim 8, and further including the step of releasing the captured ammonia from said substrate by heating the substrate.

12. A method for removing ammonia from humid air, comprising

bringing the humid air in contact with a material having a surface carrying available hydrogen ions, wherein ammonia from the humid air becomes attached to the surface of the material by reacting with the hydrogen ions.

13. The method as recited in claim 12, wherein the hydrogen ions and the ammonia react to form ammonium.