# US 11,027,241 B2 · Method of post-treating zeolite membranes by using dye molecules

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- Number: US 11,027,241 B2
- Document ID: US11027241B2
- Status: Granted
- Kind: B2
- Application number: 16/388,917
- Filed: 2019-04-19
- Published: 2019-10-24
- Granted: 2021-06-08
- Earliest claimed: 2018-04-20
- Assignees: Korea University Research and Business Foundation
- Applicants: Korea University Research and Business Foundation
- Inventors: Jungkyu Choi; Kwan Young Lee; Sung-Won Hong
- Web page: https://patentgrep.com/patent/US11027241B2

## CPC

- B01D 65/108: {Repairing membranes}
- B01D 53/228: {characterised by specific membranes}
- B01D 71/0281: {Zeolites}
- B01D 2256/10: Nitrogen
- B01D 2256/245: Methane
- B01D 2257/504: Carbon dioxide
- Y02C 20/40: of CO2
- 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)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

The present invention relates to a method of post-treating a zeolite membrane, comprising treating a defective zeolite membrane with a chemical material such as a dye molecule, which has a size larger than that of the pores of the zeolite membranes and smaller than defects in the membrane, thereby healing the defects in the membrane. The post-treatment method performs post-treatment of the zeolite membrane under mild conditions (room temperature and normal pressure), thereby selectively healing the defects in the zeolite membrane and improving the performance of the zeolite membrane. In addition, the method may provide a high-performance membrane having a high separation factor, particularly under dry conditions.

## Claims

### Claim 1

A method of post-treating a zeolite membrane, comprising:
healing selectively defects in the zeolite membrane by treating a defective zeolite membrane with a chemical material having a size larger than that of pores of the zeolite membrane and smaller than that of defects in the zeolite membrane,
wherein the chemical material is a dye.

### Claim 2 (depends on 1)

The method of post-treating a zeolite membrane of claim 1, wherein the dye is one or more selected from the group consisting of an anthraquinone dye, a triarylmethane dye, a xanthene dye, a cyanine dye, a phthalocyanine dye, a diarylmethane dye, an acridine dye, an azine dye, a thiazine dye, an oxazine dye, an azomethine dye, and an azo dye.

### Claim 3 (depends on 2)

The method of post-treating a zeolite membrane of claim 2, wherein the xanthene dye is one or more selected from the group consisting of an eosin-based dye, a fluorescein-based dye, a rhodamine-based dye, a pyronine-based dye, a calcein-based dye, and a rosamine-based dye.

### Claim 4 (depends on 1)

The method of post-treating a zeolite membrane of claim 1, wherein the dye is fluorescein sodium, Martius yellow, BBIH(2′-(4-Hydroxyphenyl)-5-(4-methyl-1-piperazinyl)-2,5′-bi(1H-benzimidazole) trihydrochloride), stilbene, DCM (4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran) or oxazole yellow.

### Claim 5 (depends on 3)

The method of post-treating a zeolite membrane of claim 3, wherein the fluorescein-based dye is a fluorescein sodium salt represented by Chemical Formula 1:

### Claim 6 (depends on 1)

The method of post-treating a zeolite membrane of claim 1, wherein a size of the dye is 0.8-3 nm.

### Claim 7 (depends on 1)

The method of post-treating a zeolite membrane of claim 1, which is performed under room temperature and normal pressure conditions.

### Claim 8 (depends on 1)

A method of separating CO2 from a mixture comprising the CO2 and a molecule selected from the group consisting of CH4, N2, O2, C2H4, C2H6, C3H6 and C3H8, comprising:
contacting the zeolite membrane post-treated by the method of claim 1 with the mixture; and
capturing the CO2 from the mixture permeated through the zeolite membrane.