Zeolite membrane structure and method for producing same

Patent metadata

Field	Value
Publication number	US-10688445-B2
Application number	US-201715701569-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Mar 31, 2015
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A zeolite membrane structure includes a porous support, and a zeolite membrane. The zeolite membrane has a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer. The porous support has an outermost layer in which the first zeolite layer is located. An average thickness of the first zeolite layer is less than or equal to 5.4 micrometers. An average pore diameter of the outermost layer is greater than or equal to 0.050 micrometers and less than or equal to 0.150 micrometers.

First claim

The invention claimed is:

1. A zeolite membrane structure comprising:
a porous support, and
a zeolite membrane, and
the zeolite membrane having a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer,
the porous support having an outermost layer in which the first zeolite layer is located,
an average thickness of the first zeolite layer being less than or equal to 5.4 micrometers, and
a 50% diameter in a volume-accumulated pore diameter distribution of the outermost layer measured by use of a pore diameter distribution measurement apparatus being greater than or equal to 0.050 micrometers and less than or equal to 0.150 micrometers.

2. The zeolite membrane structure according to claim 1 , wherein
a ratio of an average thickness of the first zeolite layer to an average thickness of the second zeolite layer is less than or equal to 2.0.

3. The zeolite membrane structure according to claim 1 , wherein
an average thickness of the first zeolite layer is less than or equal to 2.5 micrometers.

4. A method of manufacturing a zeolite membrane structure according to claim 1 , comprising:
coating a slurry for seeding containing a zeolite seed crystals on a surface of a porous support, and
causing crystal growth of the zeolite seed crystals, and wherein
a ratio of a 10% diameter in a volume-accumulated particle size distribution of the zeolite seed crystals measured by use of a laser diffraction and scattering method relative to a 90% diameter in a volume-accumulated pore diameter distribution of the porous support measured by use of a pore diameter distribution measurement apparatus is greater than or equal to 0.5, and
the 90% diameter in the volume-accumulated pore diameter distribution of the porous support measured by use of the pore diameter distribution measurement apparatus is greater than or equal to 0.050 micrometers and less than or equal to 0.180 micrometers.

5. The method of manufacturing a zeolite membrane structure according to claim 4 , wherein
a ratio of the 10% diameter of the zeolite seed crystal to the 90% diameter of the porous support is greater than or equal to 1.3, and
the 90% diameter of the porous support is less than or equal to 0.080 micrometers.

Assignees

• Ngk Insulators Ltd

Inventors

• Nagasaka Ryujiro
• Suzuki Hideyuki
• Ichikawa Akimasa
• Nakamura Shinji

Classifications

• B01D2325/02834

  more than 0.1 and up to 1 µm · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D71/0281 Primary

  Zeolites · CPC title

• B01J39/14

  Base exchange silicates, e.g. zeolites · CPC title

• B01D67/0051

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