# US 12,214,320 B2 · Separator membrane having hierarchical structure comprising mesopores, production method therefor and xylene separation method using same

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- Number: US 12,214,320 B2
- Document ID: US12214320B2
- Status: Granted
- Kind: B2
- Application number: 17/763,628
- Filed: 2020-09-24
- Published: 2022-10-20
- Granted: 2025-02-04
- Earliest claimed: 2019-09-25
- Assignees: Korea University Research and Business Foundation
- Applicants: Korea University Research and Business Foundation
- Inventors: Jungkyu Choi; Kwan-Young Lee; Sungwon Hong
- Web page: https://patentgrep.com/patent/US12214320B2

## CPC

- B01D 67/0051: {by controlled crystallisation, e,.g. hydrothermal growth}
- B01D 71/028: {Molecular sieves (carbon B01D71/021)}
- B01D 67/0006: {by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125)}
- B01D 67/0095: {Drying}
- B01D 69/02: characterised by their properties
- B01D 69/106: {Membranes in the pores of a support, e.g. polymerized in the pores or voids}
- B01D 71/0281: {Zeolites}
- B01D 2257/7027: Aromatic hydrocarbons
- B01D 2323/08: Specific temperatures applied
- B01D 2323/081: Heating
- B01D 2323/12: Specific ratios of components used
- B01D 2325/022: Asymmetric membranes
- B01D 2325/02831: less than 1 nm
- B01D 2325/02832: 1-10 nm
- B01D 2325/02833: more than 10 and up to 100 nm
- B01D 2325/04: Characteristic thickness
- B01D 2325/12: Adsorbents being present on the surface of the membranes or in the pores
- 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)

## Abstract

The present invention relates to a separator membrane having a hierarchical structure, a production method therefor and a xylene separation method using same, and to: a separator membrane having a hierarchical structure comprising mesopores, the separator membrane having mesopores introduced inside a microporous zeolite separator membrane, thereby being thin, having less defects and exhibiting high xylene permeation and separation performance; a production method therefor; and a xylene separation method using same.

## Claims

### Claim 1

A hierarchically structured zeolite membrane having a thickness of 0.1 to 5 μm and comprising micropores having a size of 2 nm or less and mesopores having a size of 2 to 20 nm,
wherein the hierarchically structured zeolite membrane comprises MFI zeolite and MEL zeolite, and
wherein the mesopores are isolated and embedded between the micropores.