Ammonia salts as regenerable CO 2 sorbents

• US 8,741,248 B2
• Filed: 04/08/2011
• Issued: 06/03/2014
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: Phillips 66 Company
• Original Assignee: Phillips 66 Company
• Inventors: Schmidt, Roland
• Primary Examiner(s): Silverman, Stanley
• Assistant Examiner(s): BERNS, DANIEL J
• Application Number:
  US13/083,343
• Publication Number:
  US 20110250121A1
• Time in Patent Office: 1,152 Days
• Field of Search: 423/210, 423/220, 423/230, 502/224, 502/400
• US Class Current: 423/230
• CPC Class Codes: B01D 2251/206 Ammonium compounds
• CPC Class Codes: B01D 2251/302 of lithium
• CPC Class Codes: B01D 2251/402 of magnesium
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: C01D 15/04 Halides
• CPC Class Codes: C01F 5/30 Chlorides
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The present method describes the absorbing and desorbing of a gaseous reactant on a solid reactant. The solid reactant is an ammonia salt selected from the group consisting of alkali ammonium salts, alkali ammonium earth salts or a combination thereof.

Claims

1. A method comprising:

absorbing and desorbing CO₂ on a solid reactant wherein the solid reactant is Li(NH₃)₆Cl,

wherein the absorption percentage of the gaseous reactant upon the solid reactant is at least 20% more effective when compared to solid reactants absent ammonia,

2. A method comprising:

absorbing CO₂ on a solid reactant to produce a sequestered carbon dioxide compound and desorbing CO₂ from the sequestered carbon dioxide compound

wherein the solid reactant is Li(NH₃)₆Cl,

wherein the absorption percentage of the gaseous reactant upon the solid reactant is at least 20% more effective when compared to solid reactants absent ammonia,

wherein, a sequestered carbon dioxide compound is manufactured from the process of combining LiCl with NH₃ to produce the solid reactant of Li(NH₃)₆Cl; and

absorbing CO₂ to the solid reactant to produce a sequestered carbon dioxide

compound selected from the group consisting of;

Li(NH₃)_6-x(CO₂)_xCl and, Li(NH₃)₆Cl x CO₂, and

wherein the desorbing of the gaseous reactant on the solid reactant is an endothermic reaction requiring enough heat to release gaseous CO₂ from the sequestered carbon dioxide compound.