# US 7,744,842 B2 · Gas adsorption and gas mixture separations using carborane-based MOF material

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- Number: US 7,744,842 B2
- Document ID: US7744842B2
- Status: Granted
- Kind: B2
- Application number: 12/317,775
- Filed: 2008-12-29
- Published: 2009-09-03
- Granted: 2010-06-29
- Earliest claimed: 2008-01-04
- Assignees: Northwestern University
- Inventors: Omar K. Farha; Joseph T. Hupp; Youn-Sang Bae; Randall Q. Snurr; Alexander M. Spokoyny; Chad A. Mirkin
- Web page: https://patentgrep.com/patent/US7744842B2

## CPC

- 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)}
- C10L 3/10: Working-up natural gas or synthetic natural gas
- C10L 3/102: {of acid contaminants}
- B01D 53/047: Pressure swing adsorption
- B01D 2253/204: Metal organic frameworks (MOF's)
- B01D 2256/24: Hydrocarbons
- B01D 2257/504: Carbon dioxide
- B01D 2257/80: Water
- B01D 2258/06: Polluted air
- Y02C 20/40: of CO2
- Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel
- 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
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A method of separating a mixture of carbon dioxide and a hydrocarbon gas using a metal-organic framework (MOF) material having a three-dimensional carborane ligand structure.

## Claims

### Claim 1

A method of separating carbon dioxide from a gas mixture, comprising contacting the mixture and a material having a metal-organic framework that includes a three dimensional carborane structure wherein the material selectively adsorbs carbon dioxide.

### Claim 2 (depends on 1)

The method of claim 1 wherein the material is represented by the formula Zn3(OH)(p-CDC)2.5 where p-CDC represents a deprotonated form of 1,12-dihydroxycarbonyl-1,12-dicarba-closo-dodecaborane.

### Claim 3 (depends on 1)

The method of claim 1 wherein the material is represented by the formula Zn3(OH)(p-CDC)2.5(L)m where L is a solvent molecule and m is an integer from 1 to 4.

### Claim 4 (depends on 3)

The method of claim 3 wherein L is diethylformamide or dimethylformamide.

### Claim 5 (depends on 1)

The method of claim 1 wherein said gas mixture includes a hydrocarbon gas.

### Claim 6 (depends on 5)

The method of claim 5 wherein the hydrocarbon gas comprises methane, propane, and/or propylene.

### Claim 7 (depends on 1)

The method of claim 1 that separates carbon dioxide from natural gas.

### Claim 8 (depends on 1)

The method of claim 1 that separates carbon dioxide from landfill gas.

### Claim 9 (depends on 1)

The method of claim 1 including the further step of substantially reversible carbon dioxide desorption from the material.

### Claim 10 (depends on 1)

The method of claim 1 that uses the pressure swing adsorption process for separation of the mixture.