Metal organic framework absorbent platforms for removal of CO2 and H2S from natural gas

Patent metadata

Field	Value
Publication number	US-11534712-B2
Application number	US-202017109844-A
Country	US
Kind code	B2
Filing date	Dec 2, 2020
Priority date	Apr 7, 2015
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

Provided herein are metal organic frameworks comprising metal nodes and N-donor organic ligands which have high selectivity and stability in the present of gases and vapors including H 2 S, H 2 O, and CO 2 . Methods include capturing one or more of H 2 S, H 2 O, and CO 2 from fluid compositions, such as natural gas.

First claim

What is claimed is:

1. A method of capturing chemical species from a fluid composition, comprising:
contacting a metal organic framework of formula [M a M b F 6-n (O/H 2 O) w (Ligand) x (solvent) y ] z with a fluid composition including at least carbon dioxide and hydrogen sulfide; and
capturing carbon dioxide and hydrogen sulfide from the fluid composition;
wherein M a is selected from periodic groups IB, IIA, IIB, IIIA, IVA, IVB, VIB, VIIB, and VIII;
wherein M b is selected from Al +3 , Ga 3+ , Fe +2 , Fe +3 , Cr 2+ , Cr 3+ , Ti 3+ , V 3+ , V 5+ , Sc 3+ , In 3+ , Nb 5+ , and Y 3+ ;
wherein the Ligand is a polyfunctional organic ligand, and x is 1 or more;
wherein n is 1, w is 1, x is 2, y is 0 to 4, solvent is a guest molecule, and z is at least 1.

2. The method of claim 1 , wherein M a includes at least one of Zn 2+ , Co 2+ , Ni 2+ , Mn 2+ , Zr 2+ , Fe 2+ , Ca 2+ , Ba 2+ , Pb 2+ , Pt 2+ , Pd 2+ , Ru 2+ , Rh 2+ , Mg 2+ , Al +3 , Fe 2+ , Fe +3 , Cr 2+ , Cr 3+ , Ru 2+ , Ru 3+ , and Co 3+ .

3. The method of claim 1 , wherein the Ligand includes at least one of pyrazine, pyrimidine, pyridazine, triazine, thiazole, oxazole, imidazole, pyrazole, triazole, oxadiazole, thiadiazole, benzoxazole, and benzimidazole.

4. The method of claim 1 , wherein M a is Ni 2+ .

5. The method of claim 1 , wherein the Ligand is pyrazine.

6. The method of claim 1 , wherein the metal organic framework includes open metal sites.

7. The method of claim 1 , wherein capturing comprises physical adsorption, chemisorption, or both physical adsorption and chemisorption of the one or more captured chemical species by the metal organic framework.

8. The method of claim 7 , wherein the metal organic framework includes one or more open metal sites and wherein chemisorption occurs by one or more captured chemical species chemically interacting with the one or more open metal sites.

9. The method of claim 1 , wherein the fluid composition further comprises water, methane, or both water and methane.

10. The method of claim 1 , further comprising desorbing at least one of carbon dioxide and hydrogen sulfide.

11. The method of claim 1 , further comprising changing the pressure, temperature, or both pressure and temperature of the capture environment to alter the affinity of one or more of carbon dioxide and hydrogen sulfide for the metal organic framework adsorbent.

12. The method of claim 1 , wherein carbon dioxide and hydrogen sulfide are captured from the fluid composition simultaneously.

Assignees

• Univ King Abdullah Sci & Tech
• Saudi Arabian Oil Co

Inventors

• Eddaoudi Mohamed
• Cadiau Amandine
• Bhatt Prashant M
• Adil Karim
• Belmabkhout Youssef

Classifications

• B01D2257/304

  Hydrogen sulfide · CPC title

• B01D53/02 Primary

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01J20/3483

  by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling · CPC title

• B01D2256/245

  Methane · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title