# US 2021/0331122 A1 · Two-dimensional nanoporous covalent organic framework for selective separation and filtration membrane formed therefrom

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- Number: US 2021/0331122 A1
- Document ID: US20210331122A1
- Status: Published application
- Kind: A1
- Application number: 17/268,138
- Filed: 2019-08-14
- Published: 2021-10-28
- Earliest claimed: 2018-08-14
- Assignees: University of Wyoming
- Applicants: University of Wyoming
- Inventors: Katie Dongmei Li-Oakey; Jiashi Yin; Phuoc Hoang-Hanh Duong
- Web page: https://patentgrep.com/patent/US20210331122A1

## CPC

- B01D 69/141: {Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes}
- B01D 53/228: {characterised by specific membranes}
- B01D 61/027: {Nanofiltration}
- B01D 69/02: characterised by their properties
- B01D 69/10: Supported membranes; Membrane supports
- B01D 71/421: {Polyacrylonitrile}
- B01D 71/72: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of the groups B01D71/46 - B01D71/70 {and B01D71/701 - B01D71/702}
- B01D 71/82: characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
- C02F 1/442: {by nanofiltration}
- C08J 9/0061: {characterized by the use of several polymeric components}
- C08J 9/286: {the liquid phase being a solvent for the monomers but not for the resulting macromolecular composition, i.e. macroporous or macroreticular polymers}
- C08L 33/20: Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence)
- B01D 2325/0283: Pore size
- B01D 2325/18: Membrane materials having mixed charged functional groups
- B01D 2325/20: Specific permeability or cut-off range
- B01D 2325/30: Chemical resistance
- C02F 2103/10: from quarries or from mining activities
- C08J 2201/0544: the non-solvent being aqueous
- C08J 2333/20: Homopolymers or copolymers of acrylonitrile (C08J2355/02 takes precedence)
- C08J 2471/02: Polyalkylene oxides
- 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)
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A membrane filter is provided. The membrane filter including an ordered functional nanoporous material (OFNM) defining a layer and a membrane support. The layer having a two-dimensional structure and defining a plurality of pores and imparting to the membrane filter a permeance of at least 900 Lm−2h−1bar−1 and a rejection of at least 60% as to a solvent containing a filterable species.

## Claims

### Claim 1

A membrane filter comprising:
an ordered functional nanoporous material (OFNM) defining a layer, said layer having a two-dimensional structure and defining a plurality of pores; and
a membrane support, said layer imparting to the membrane filter a permeance of at least 900 Lm−2h−1bar−1 and a rejection of at least 60% as to a solvent containing a filterable species.

### Claim 2 (depends on 1)

The membrane filter of claim 1 wherein said layer is configured to allow the solvent to pass through the plurality of pores and to prevent filterable species in the solvent from passing through the plurality of pores based on a size or charge of the filterable species.

### Claim 3 (depends on 1)

The membrane filter of claim 1 wherein said layer has an ion conductivity configured to support an ion current.

### Claim 4 (depends on 3)

The membrane filter of claim 3 wherein said layer repels negatively charged ions from crossing therethrough.

### Claim 5 (depends on 1)

The membrane filter of claim 1 wherein the two-dimensional structure includes a plurality of interlined hexagonal structures.

### Claim 6 (depends on 5)

The membrane filter of claim 5 wherein the hexagonal structures are symmetric.

### Claim 7 (depends on 1)

The membrane filter of claim 1 wherein the two-dimensional structure is a crystalline structure.

### Claim 8 (depends on 7)

The membrane filter of claim 7 wherein the crystalline structure is up to 300 nm.

### Claim 9 (depends on 1)

The membrane filter of claim 1 wherein the filter is gravity fed.

### Claim 10 (depends on 1)

The membrane filter of claim 1 wherein the membrane filter is formed of a two-dimensional covalent organic framework (COF) polymer.

### Claim 11 (depends on 10)

The membrane filter of claim 10 wherein the COF is a carboxyl functionalized COF.

### Claim 12 (depends on 10)

The membrane filter of claim 10 wherein the COF is tertiary amine functionalized COF.

### Claim 13 (depends on 12)

The membrane filter of claim 12 configured for use with produced water treatment.

### Claim 14 (depends on 12)

The membrane filter of claim 12 configured for use with wastewater treatment.

### Claim 15 (depends on 12)

The membrane filter of claim 12 configured for use with protein separation.

### Claim 16 (depends on 12)

The membrane filter of claim 12 configured for use with solvent resistant nanofiltration.

### Claim 17 (depends on 12)

The membrane filter of claim 12 configured for use with organic solvent resistant nanofiltration.

### Claim 18 (depends on 12)

The membrane filter of claim 12 configured for use with gas separation.

### Claim 19 (depends on 12)

The membrane filter of claim 12 wherein the membrane filter has a water permeance of at least 2000 Lm−2h−1bar−1.