# US 2014/0150648 A1 · Fluorinated ethylene-propylene polymeric membranes for gas separations

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- Number: US 2014/0150648 A1
- Document ID: US20140150648A1
- Status: Published application
- Kind: A1
- Application number: 14/176,732
- Filed: 2014-02-10
- Published: 2014-06-05
- Earliest claimed: 2012-11-16
- Assignees: Uop LLC
- Applicants: Uop LLC
- Inventors: Chunqing Liu; Zara Osman; Howie Q. Tran; Changqing Lu; Andrew J. Poss; Rajiv R. Singh; David Nalewajek; Cheryl L. Cantlon
- Web page: https://patentgrep.com/patent/US20140150648A1

## CPC

- B01D 71/34: Polyvinylidene fluoride
- B01D 53/228: {characterised by specific membranes}
- B01D 67/0018: {Thermally induced processes [TIPS]}
- B01D 71/32: containing fluorine atoms
- B01D 71/76: Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 (rubbers in general B01D71/24)
- H01M 8/1023: having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes
- H01M 8/1039: halogenated, e.g. sulfonated polyvinylidene fluorides
- B01D 61/025: {Reverse osmosis; Hyperfiltration}
- B01D 71/36: Polytetrafluoroethylene
- B01D 2323/12: Specific ratios of components used
- Y02E 60/50: Fuel cells
- 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)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A fluorinated ethylene-propylene polymeric membrane comprising a copolymer comprising 2,3,3,3-tetrafluoropropene and vinylidene fluoride is disclosed. The fluorinated ethylene-propylene polymeric membranes of the invention are especially useful in gas separation processes in air purification, petrochemical, refinery, and natural gas industries.

## Claims

### Claim 1

A process of separating at least two gases or two liquids comprising contacting said gases or liquids with a membrane comprising a copolymer comprising 10 to 99 mol % 2,3,3,3-tetrafluoropropene-based structural units and 1 to 90 mol % vinylidene fluoride-based structural units.

### Claim 2 (depends on 1)

The process of claim 1 wherein said membrane comprises a plurality of first repeating units of formula (I):
wherein n and m are independent integers from 100 to 20000.

### Claim 3 (depends on 1)

The process of claim 1 wherein said membrane comprises a copolymer comprising 70 to 90 mol % 2,3,3,3-tetrafluoropropene-based structural units and 10 to 30 mol % vinylidene fluoride-based structural units.

### Claim 4 (depends on 1)

The process of claim 1 wherein said membrane comprises a copolymer comprising 30 to 70 mol % 2,3,3,3-tetrafluoropropene-based structural units and 30 to 70 mol % vinylidene fluoride-based structural units.

### Claim 5 (depends on 1)

The process of claim 1 wherein said membrane further comprises structural units derived from hexafluoropropene.

### Claim 6 (depends on 1)

The process of claim 1 wherein said membrane has carbon dioxide permeability of at least 5 Barrers and single-gas CO2/CH4 selectivity of at least 40 at 35° C. under 791 kPa feed pressure

### Claim 7 (depends on 1)

The process of claim 1 wherein said gases are separated from natural gas and comprise one or more gases selected from the group consisting of carbon dioxide, oxygen, nitrogen, water vapor, hydrogen sulfide and helium.

### Claim 8 (depends on 1)

The process of claim 1 wherein said gases are volatile organic compounds.

### Claim 9 (depends on 8)

The process of claim 8 wherein said volatile organic compounds are selected from the group consisting of toluene, xylene and acetone.

### Claim 10 (depends on 1)

The process of claim 1 wherein said gases comprise a mixture of carbon dioxide and at least one gas selected from hydrogen, flue gas and natural gas.

### Claim 11 (depends on 1)

The process of claim 1 wherein said gases are a mixture of olefins and paraffins or iso and normal paraffins.

### Claim 12 (depends on 1)

The process of claim 1 wherein said gases comprise a mixture of gases selected from the group consisting of nitrogen and oxygen, carbon dioxide and methane, hydrogen and methane or carbon monoxide, helium and methane.

### Claim 13 (depends on 1)

The process of claim 1 wherein said gases comprise a mixture of hydrogen, nitrogen, methane and argon in ammonia purge gas streams.