# US 8,540,802 B2 · Adsorptive gas separation of multi-component gases

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- Number: US 8,540,802 B2
- Document ID: US8540802B2
- Status: Granted
- Kind: B2
- Application number: 12/598,855
- Filed: 2008-05-09
- Published: 2010-06-03
- Granted: 2013-09-24
- Earliest claimed: 2007-05-11
- Assignees: The Regents of the University of California
- Applicants: Omar M. Yaghi; Hideki Hayashi; Rahul Banerjee
- Inventors: Omar M. Yaghi; Hideki Hayashi; Rahul Banerjee
- Web page: https://patentgrep.com/patent/US8540802B2

## CPC

- C01B 37/00: Compounds having molecular sieve properties but not having base-exchange properties
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01J 20/226: {Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F)}
- C01G 9/00: Compounds of zinc
- C01G 15/00: Compounds of gallium, indium or thallium
- B01D 2253/204: Metal organic frameworks (MOF's)
- B01D 2257/502: Carbon monoxide
- B01D 2257/504: Carbon dioxide
- B01D 2257/7022: Aliphatic hydrocarbons
- B01D 2257/7027: Aromatic hydrocarbons
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/77: by unit-cell parameters, atom positions or structure diagrams
- C01P 2002/88: by thermal analysis data, e.g. TGA, DTA, DSC
- C01P 2006/10: Solid density
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- Y02C 20/40: of CO2
- Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. CO2
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The disclosure relates generally to a gas-separation system for separating one or more components from a multi-component gas using Zeolitic imidazolate or imidazolate-derived framework.

## Claims

### Claim 1

A method of separating a component gas from a multi-component gas, comprising contacting a functionalized zeolitic framework with the multi-component gas,
wherein a component of the multi-component gas is selectively adsorbed to the functionalized zeolitic framework by electrostatically interacting with the one or more electron withdrawing group of the pore walls, thereby separating the absorbed component from other components in the multi-component gas,
wherein the functionalized zeolitic framework is ZIF-68, ZIF-69, or ZIF-70, and
wherein the method comprises either (a) separating the component gas from a multicomponent gas, where the multicomponent gas is natural gas, or (b) separating the component gas from a multi-component gas that is rich in methane and contains CO2, where the component gas is CO2 and the component gas is adsorbed by the zeolitic framework.

### Claim 2 (depends on 1)

The method of claim 1, wherein the functionalized zeolitic framework comprises a plurality of pores, each of the plurality of pores comprises a sufficient number of accessible sites for atomic or molecular adsorption.

### Claim 3 (depends on 2)

The method of claim 2, wherein a surface area of a pore of the plurality of pores is greater than about 2000 m2/g.

### Claim 4 (depends on 2)

The method of claim 2, wherein a surface area of a pore of the plurality of pores is about 3,000-18,000 m2/g.

### Claim 5 (depends on 2)

The method of claim 2, wherein a surface area of a pore of the plurality of pores is about 3,000-6,000 m2/g.

### Claim 6 (depends on 2)

The method of claim 2, wherein a pore of the plurality of pores comprises a pore volume 0.1 to 0.99 cm3/cm3.

### Claim 7 (depends on 2)

The method of claim 2, wherein a pore of the plurality of pores comprises a pore volume of 0.4-0.5 cm3/cm3.

### Claim 8 (depends on 1)

The method of claim 1, wherein the functionalized zeolitic framework has a framework density of about 0.17 g/cm3.

### Claim 9 (depends on 1)

The method of claim 1, wherein the adsorbed component is selected from the group consisting of ammonia, carbon dioxide, hydrogen, amines, oxygen, argon, nitrogen, organic dyes, polycyclic organic molecules, and combinations thereof.

### Claim 10

A method of separating a component from a multi-component gas, comprising: passing a multi-component gas through a functionalized zeolitic imidazolate framework comprising one or more pore walls that are polar, wherein the component gas is selectively adsorbed to the polar pore walls of the functionalized zeolitic imidazolate framework, wherein the functionalized zeolitic imidazolate framework is ZIF-68, ZIF-69, or ZIF-70, and wherein the multicomponent gas is (a) natural gas, or (b) a multi-component gas that is rich in methane and contains CO2, where the component gas is CO2 and the component gas is adsorbed by the zeolitic framework.

### Claim 11 (depends on 1, 10)

The method of claim 1 or 10, wherein the multi-component gas is natural gas.

### Claim 12 (depends on 1, 10)

The method of claim 1 or 10, wherein the multi-component gas is rich in methane and contains CO2 and CO2 is the component that is being selectively adsorbed by the functionalized zeolitic framework.