Polymer for carbon dioxide capture and separation

Patent metadata

Field	Value
Publication number	US-10323125-B1
Application number	US-201715625015-A
Country	US
Kind code	B1
Filing date	Jun 16, 2017
Priority date	Jun 16, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

One or more embodiments relate to providing substrate for separating a first gas component from a gaseous mixture, said substrate comprising a benzimidazole-linked polymer. Also provided is a method for synthesizing a substrate for separating a first gas component from a gaseous mixture, the method comprising performing a free condensation reaction between an aryl-o-diamine and an aryl-aldehyde to yield a benzimidazole-linked polymer. Other embodiments related to providing a CO2 separation membrane comprising benzimidazole-linked polymer residing within a matrix.

First claim

The embodiment of the invention in which an exclusive property or privilege is claimed is defined as follows:

1. A substrate for separating a first gas component from a gaseous mixture, said substrate comprising a benzimidazole-linked polymer which has a pore size distribution equal to or less than about 0.60 nm, wherein the benzimidazole-linked polymer has the following structural formula:

2. The substrate as recited in claim 1 wherein the first gas component is a chemical moiety selected from the group consisting of CO 2 , CH 4 , H 2 , N 2 , C 2 H 4 , and combinations thereof.

3. The substrate as recited in claim 1 wherein the first gas component is CO 2 and the substrate has a CO 2 /N 2 selectivity of greater than approximately 70.

4. The substrate as recited in claim 1 wherein the first gas component is CO 2 and has a regeneration energy no greater than about 40 kJ/mol.

5. The substrate as recited in claim 1 wherein the polymer defines pores and amines residing within the pores.

6. A method for synthesizing a substrate for separating a first gas component from a gaseous mixture, the method comprising performing a free condensation reaction between an aryl-o-diamine and an aryl-aldehyde yielding a benzimidazole-linked polymer having a pore size distribution equal to or less than about 0.60 nm, wherein the free condensation reaction is performed between (i) 1,2,4,5-benzenetetramine tetrahydrochloride and benzene-1,3,5-tricarbaldehyde, (ii) [1,1′-biphenyl]-3,3′4,4′-tetraamine and benzene-1,3,5-tricarbaldehyde, or (iii) 1,2,4,5-benzenetetramine tetrahydrochloride and N,N-diformylformamide.

7. The method as recited in claim 6 wherein the substrate is produced in a single reaction vessel.

8. The method as recited in claim 6 wherein the reactants are template free.

9. The method as recited in claim 6 wherein secondary and tertiary amines are supplied by imidazole.

10. The method as recited in claim 6 wherein the substrate has a nitrogen to carbon molar ratio of up to about 68:24.

11. The method as recited in claim 6 wherein no metal catalyst is required.

12. A CO 2 separation membrane comprising a benzimidazole-linked polymer residing within a matrix, wherein the benzimidazole-linked polymer has a pore size distribution equal to or less than about 0.60 nm and has the following structural formula:

13. The membrane as recited in claim 12 wherein the matrix is a microporous polymer of polydibenzodioxin.

14. The membrane as recited in claim 12 wherein between 10 and 40 weight percent of the membrane is the benzimidazole-linked polymer.

15. The membrane as recited in claim 12 wherein the membrane display a CO 2 permeability of greater than 6000 Barrer.

16. The membrane as recited in claim 12 wherein the membrane has a CO 2 /N 2 selectivity greater than 15.

17. The membrane as recited in claim 12 wherein the matrix is a polymer selected from the group consisting of phthalocyanine, polyimide, polysulfone, polyethylene glycol and combinations thereof.

Assignees

• Us Energy
• Us Dept Energy

Inventors

• Hopkinson David
• Sekizkardes Ali Kemal

Classifications

• C08G73/18

  Polybenzimidazoles · CPC title

• B01D2325/12

  Adsorbents being present on the surface of the membranes or in the pores · CPC title

• B01D53/228

  characterised by specific membranes · CPC title

• B01D2253/202

  Polymeric adsorbents · CPC title

• B01D2253/308

  Pore size · CPC title