Pelletized immobilized amine sorbent for CO2 capture

• US 10,065,174 B1
• Filed: 05/17/2016
• Issued: 09/04/2018
• Est. Priority Date: 09/28/2015
• Status: Active Grant

• Current Assignee: US Department of Energy (Government of the United States of America)
• Original Assignee: US Department of Energy (Government of the United States of America)
• Inventors: Wifong, Walter C., Gray, McMahan L., Soong, Yee, Kail, Brian W.
• Primary Examiner(s): Lee, Rip A
• Application Number:
  US15/156,773
• Time in Patent Office: 840 Days
• CPC Class Codes: B01J 20/267 Cross-linked polymers
• CPC Class Codes: B01J 20/28011 Other properties, e.g. density, crush strength
• CPC Class Codes: B01J 20/28016 Particle form
• CPC Class Codes: B01J 20/3028 Granulating, agglomerating or aggregating
• CPC Class Codes: B01J 20/3042 Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent
• CPC Class Codes: B01J 20/32 Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3231 characterised by the coating or impregnating layer
• CPC Class Codes: B01J 2220/4887 Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

The disclosure describes a pelletized sorbent comprising a first component comprising Basic Immobilized Amine Sorbent, a second component comprising inorganic strength additive, and a third component comprising polymer binder, where the Basic Immobilized Amine Sorbent and solid inorganic strength additive are interconnected by the polymer binder. The pelletized sorbent is useful for removing CO₂ from a gaseous mixture such as a post combustion gas stream.

Claims

1. A pelletized sorbent for separation of CO₂ from a gaseous mixture, said pelletized sorbent comprising:

a first component comprising a Basic Immobilized Amine Sorbent;

a second component comprising fly ash; and

a third component comprising a polymer binder,

wherein the Basic Immobilized Amine Sorbent and fly ash are interconnected by the polymer binder.

2. The pelletized sorbent of claim 1 wherein the Basic Immobilized Amine Sorbent is present in the range from about 63% to about 92% of the total dry pelletized sorbent weight.

3. The pelletized sorbent of claim 1 wherein the polymer binder is selected from the group consisting of poly(vinyl chloride), poly(chloroprene), poly(vinyl alcohol), poly(vinyl acetate), and polystyrene.

4. The pelletized sorbent of claim 3 wherein the polymer binder is poly(vinyl chloride) or poly(chloroprene).

5. The pelletized sorbent of claim 1 wherein the pelletized sorbent is hydrophobic.

6. The pelletized sorbent of claim 1 further comprising:

a fourth component comprising a cross-linker having at least two functional groups, wherein the at least two functional groups are bound to the polymer binder.

7. The pelletized sorbent of claim 6 wherein the at least two functional groups are selected from the group consisting of aldehyde, amine, carboxylic acid, epoxy, aminosilane, alkoxysilane, cyanate, isocyanate, acrylate, cyanoacrylate, and combinations thereof.

8. The pelletized sorbent of claim 7 wherein the cross-linker is a polyamine.

9. The pelletized sorbent of claim 1 further comprising:

a crush strength equal to or greater than about 0.3 MPa.

10. The pelletized sorbent of claim 9 wherein the crush strength is equal to or greater than about 1.3 MPa.

11. The pelletized sorbent of claim 1 further comprising:

a CO₂ sorbent capacity equal to or greater than about 1.0 mmol/g.

12. The pelletized sorbent of claim 11 wherein the CO₂ sorbent capacity is equal to or greater than about 2.0 mmol/g.

13. The pelletized sorbent of claim 1 further comprising:

a percentage of CO₂ capture retained (PCR) value equal to or greater than about 20%.

14. The pelletized sorbent of claim 13 wherein the PCR value is equal to or greater than about 50%.

15. The pelletized sorbent of claim 1 further comprising:

a CO₂ sorbent capacity equal to or greater than about 1.7 mmol/g; and

a percentage of CO₂ capture retained (PCR) value greater than 20%.

16. The pelletized sorbent of claim 1 further comprising:

a CO₂ sorbent capacity greater than 2.0 mmol/g; and

a percentage of CO₂ capture retained (PCR) value greater than 50%.

17. A pelletized sorbent for separation of CO₂ from a gas mixture, said pelletized sorbent comprising:

a first component comprising Basic Immobilized Amine Sorbent (BIAS),

wherein the Basic Immobilized Amine Sorbent is a Class 1, Class 2, or hybrid Class 1/Class 2 BIAS, and

wherein the Basic Immobilized Amine Sorbent is present in the range from about 68% to about 85% of the total dry pelletized sorbent weight;

a second component comprising inorganic strength additive, wherein the inorganic strength additive is fly ash,

wherein the inorganic strength additive is present in the range from about 5% to about 37% of the total dry pelletized sorbent weight; and

a third component comprising a polymer binder,

wherein the Basic Immobilized Amine Sorbent and the inorganic strength additive are interconnected by the polymer binder; and

wherein the pelletized sorbent exhibits

a CO₂ sorbent capacity greater than 1.7 mmol/g;

a crush strength equal to or greater than 1.0 MPa or attrition value less than 1% after 24 hrs; and

a (PCR) value greater than 50%.

18. The pelletized sorbent of claim 17 wherein the polymer binder is hydrophobic.

19. The pelletized sorbent of claim 18 further comprising:

a fourth component comprising a cross-linker having at least two functional groups.

20. The pelletized sorbent of claim 19 where the cross-linker is a polyamine.

21. A pelletized sorbent for separation of CO₂ from a gaseous mixture, said pelletized sorbent comprising:

a first component comprising a Basic Immobilized Amine Sorbent;

a second component comprising an inorganic strength additive; and

a third component comprising a polymer binder comprising poly(vinyl chloride) or poly(chloroprene),

wherein the Basic Immobilized Amine Sorbent and inorganic strength additive are interconnected by the polymer binder.

22. A pelletized sorbent for separation of CO₂ from a gaseous mixture, said pelletized sorbent comprising:

a first component comprising a Basic Immobilized Amine Sorbent;

a second component comprising an inorganic strength additive; and

a third component comprising a polymer binder; and

a fourth component comprising a cross-linker having at least two functional groups, wherein the at least two functional groups are bound to the polymer binder, and

wherein the Basic Immobilized Amine Sorbent and solid inorganic strength additive are interconnected by the polymer binder.