Synthesis of ultra-small pore aluminosilicates by controlled structural collapse of zeolites

Patent metadata

Field	Value
Publication number	US-9403148-B2
Application number	US-201414311980-A
Country	US
Kind code	B2
Filing date	Jun 23, 2014
Priority date	Jun 23, 2014
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A method of forming the highly selective ultra-small pore amorphous adsorbent includes introducing an ion-exchange material to a sodium aluminosilicate zeolite such that an ion-exchanged zeolite forms, calcinating the ion-exchanged zeolite at a calcination temperature such that the ion-exchanged zeolite collapses and forms the decationized amorphous adsorbent, and introducing a back ion-exchange material to the decationized amorphous adsorbent such that the highly selective ultra-small pore amorphous adsorbent forms. The highly selective ultra-small pore amorphous adsorbent has a pore aperture size operable to permit carbon dioxide to adsorb into the amorphous adsorbent and operable to deny methane from adsorbing into the amorphous adsorbent.

First claim

What is claimed is:

1. A method of forming a highly selective ultra-small pore amorphous adsorbent; the method comprising the steps of:
introducing an ion-exchange material to a sodium. aluminosilicate zeolite such that an ion-exchanged zeolite forms;
calcinating the ion-exchanged zeolite at a calcination temperature such that the ion-exchanged zeolite collapses and forms a decationized amorphous adsorbent; and
introducing a back ion-exchange material to the decationized amorphous adsorbent such that the highly selective ultra-small pore amorphous adsorbent forms,
where the highly selective Ultra-small pore amorphous adsorbent has a pore aperture size operable to permit carbon dioxide to adsorb into the amorphous adsorbent and operable to deny methane from adsorbing into the amorphous adsorbent, and
where the pore aperture size is in a range of from 0.33 nm to 0.38 nm.

2. The method of claim I where the sodium aluminosilicate zeolite is a Linde Type A zeolite.

3. The method of claim 1 where the positive ion of the ion-exchange material is an ammonium ion.

4. The method of claim 1 where the calcination temperature is in a range of from 473° K. to 773° K.

5. The method of claim 1 where the positive ion of the back ion-exchange material is selected from the group consisting of an alkali metal cation or an alkaline earth metal cation.

6. The method of claim 5 where the positive ion is a sodium cation.

7. The method of claim 1 where the amorphous adsorbent has a carbon dioxide/methane selectivity factor in a range of from greater than 2.5 to 6.5 after 30 minutes at 8bar and 298° K.

8. The method of claim 1 where the amorphous adsorbent has a carbon dioxide/methane selectivity factor in a range of from greater than 2.5 to 40 after 2 minutes at 8bar and 298° K.

9. A highly selective ultra-small pore amorphous adsorbent comprising an aluminosilicate matrix of a collapsed cation exchanged aluminosilicate zeolite, where the amorphous adsorbent has a pore aperture size operable to permit carbon dioxide to adsorb into the amorphous adsorbent and operable to deny methane from adsorbing into the amorphous adsorbent and where the amorphous adsorbent has a carbon dioxide/methane selectivity factor, and where the amorphous adsorbent has a pore aperture size in a range of from 0.33 nm to 0.38 nm.

10. The composition of claim 9 where the aluminosilicate zeolite has a sodium Linde Type A structure.

11. The composition of claim 9 where the cation is selected from the group consisting of an alkali metal cation or an alkaline earth metal cation.

12. The composition of claim 11 where the alkali metal cation is a sodium cation.

13. The composition of claim 9 where the carbon dioxide/methane selectivity factor is in a range of from greater than 2.5 to 6,5 after 30 minutes at 8 bar and 298° K.

14. The composition of claim 9 where the amorphous adsorbent has a carbon dioxide/methane selectivity factor in a range of from greater than 2.5 to 40 after 2 minutes at 8 bar and 298° K.

15. A method for upgrading a natural gas stream comprises the steps of:
introducing a natural gas to a vessel containing the highly selective ultra-small pore amorphous adsorbent of claim 9 , where the natural gas has a first mole percent of nitrogen and a first mole percent of carbon dioxide; and
maintaining the natural gas in the vessel for a residence time such that the natural gas contacts the amorphous adsorbent and that an upgraded natural gas forms, where the upgraded natural gas has a second mole percent of nitrogen and a second mole percent of carbon dioxide, where the first mole percent of nitrogen is greater than the second mole percent of nitrogen, and where the first mole percent of carbon dioxide is greater than the second mole percent of carbon dioxide.

16. The method of claim 15 where the residence time is in a re of two minutes to 30 minutes.

17. The method of claim 15 where the amorphous adsorbent has a carbon dioxide/methane selectivity factor in a range of from greater than 2.5 to 40 after 2minutes at 8 bar and 298° K.

Assignees

• Saudi Arabian Oil Co
• Korea Advanced Inst Sci & Tech

Inventors

• Wang Yuguo
• Ercan Cemal
• Othman Rashid M
• Choi Minkee
• Kim Hyeonbin

Classifications

• B01D53/04

  with stationary adsorbents {(B01D53/025 takes precedence)} · CPC title

• B01D2256/10

  Nitrogen · CPC title

• B01D2253/308

  Pore size · CPC title

• B01J20/2808

  being less than 2 nm, i.e. micropores or nanopores · CPC title

• C10L3/104

  Carbon dioxide · CPC title