Porous support-zeolite membrane composite, and method for producing porous support-zeolite membrane composite

Patent metadata

Field	Value
Publication number	US-10369528-B2
Application number	US-201715602453-A
Country	US
Kind code	B2
Filing date	May 23, 2017
Priority date	Nov 25, 2014
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 μm or less on average.

First claim

The invention claimed is:

1. A separation or concentration method of a gas mixture, comprising:
bringing a gas mixture into contact with a porous support-zeolite membrane composite, the gas mixture comprising a high-permeability component and a low-permeability component which is less permeable to the porous support-zeolite membrane composite than the high-permeability component; and
separating by permeation the high-permeability component from the gas mixture, or concentrating the low-permeability component by permeation and separation of the high-permeability component,
wherein the porous support-zeolite membrane composite comprises:
a porous support; and
a zeolite membrane formed on the porous support,

wherein:
part of the zeolite membrane penetrates into the inside of the porous support;
the distance from the surface of the porous support to the inside into which the zeolite membrane penetrates is 5.0 μm or less on average;
a zeolite constituting the zeolite membrane comprises Si and Al, and has the SiO 2 /Al 2 O 3 molar ratio of 20 or more; and
the zeolite has a pore structure of not more than oxygen 8 members ring.

2. The separation or concentration method according to claim 1 , wherein the SiO 2 /Al 2 O 3 molar ratio of the zeolite membrane is 2,000 or less.

3. The separation or concentration method according to claim 1 , wherein the average pore size of the porous support is 0.3 μm or more.

4. The separation or concentration method according to claim 1 , wherein the pore structure of zeolite constituting the zeolite membrane is CHA.

5. The separation or concentration method according to claim 1 , wherein the distance from the surface of the porous support to the inside into which the zeolite membrane penetrates is from 0.03 to 1.7 μm on average.

6. The separation or concentration method according to claim 1 , wherein the porous support-zeolite membrane composite further comprises inorganic particles other than zeolite attached to the porous support.

7. The separation or concentration method according to claim 6 , wherein the inorganic particles are silica particles.

Assignees

• Mitsubishi Chem Corp

Inventors

• ONOZUKA Ayuko
• Yamada Miki
• Hayashi Mikio
• Takewaki Takahiko

Classifications

• B01D67/0051

  by controlled crystallisation, e,.g. hydrothermal growth · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• B01D53/228

  characterised by specific membranes · CPC title

• C01B39/48

  using at least one organic template directing agent · CPC title

• C01B39/38

  Type ZSM-5 · CPC title