Dehydration method, dehydration apparatus, and membrane structure

Patent metadata

Field	Value
Publication number	US-2020101419-A1
Application number	US-201916703151-A
Country	US
Kind code	A1
Filing date	Dec 4, 2019
Priority date	Jun 7, 2017
Publication date	Apr 2, 2020
Grant date	—

Abstract

A dehydration method is a dehydration method for selectively separating water from a mixture that contains water, using a zeolite membrane having an AFX structure, and the method includes a step of supplying the mixture to a supply side space of the zeolite membrane having an AFX structure, and a step of making a pressure difference between the supply side space and a permeation side space of the zeolite membrane having an AFX structure.

First claim

1 . A dehydration method for selectively separating water from a mixture that contains water, using a zeolite membrane having an AFX structure, the method comprising:
a step of supplying the mixture to a supply side space of the zeolite membrane having an AFX structure; and a step of making a pressure difference between the supply side space and a permeation side space of the zeolite membrane having an AFX structure.

2 . The dehydration method according to claim 1 , wherein
the zeolite membrane having an AFX structure contains at least Si, Al, and O.

3 . The dehydration method according to claim 1 , wherein
the zeolite membrane having an AFX structure is formed on a porous support.

4 . A dehydration apparatus comprising:
a separation vessel configured to include a porous support, a zeolite membrane having an AFX structure that is formed on the porous support, and a housing portion that is sectioned into a supply side space of the zeolite membrane having an AFX structure and a permeation side space of the zeolite membrane having an AFX structure; and a pressure changing apparatus configured to increase a pressure in the supply side space and/or reduces a pressure in the permeation side space.

5 . The dehydration apparatus according to claim 4 , wherein
the zeolite membrane having an AFX structure contains at least Si, Al, and O.

6 . The dehydration apparatus according to claim 4 , wherein
the zeolite membrane having an AFX structure contains at least a zeolite having an AFX structure.

7 . A membrane structure comprising:
a support; and a zeolite membrane having an AFX structure, the zeolite membrane being formed on the support, wherein in an X-ray diffraction pattern obtained by irradiation of X-rays to a surface of the zeolite membrane, a peak intensity of a (110) plane is 0.4 times or more and 2 times or less a peak intensity of a (004) plane, and surface roughness (Ra) of the zeolite membrane is 5 μm or less.

8 . The membrane structure according to claim 7 , wherein
the zeolite membrane contains at least Si, Al, and O.

9 . The membrane structure according to claim 8 , wherein
a ratio of a substance amount of Si at the surface of the zeolite membrane is higher than a ratio of a substance amount of Si inside the zeolite membrane.

10 . The membrane structure according to claim 7 , wherein
the zeolite membrane substantially does not contain P.

11 . The membrane structure according to claim 7 , wherein
a water permeation flux of the zeolite membrane at 50° C. is 1 kg/(m 2 ·h) or more.

Assignees

• Ngk Insulators Ltd

Inventors

• Noda Kenichi
• Miyahara Makoto
• Shimizu Katsuya
• Hagio Takeshi

Classifications

• C01B39/54

  Phosphates, e.g. APO or SAPO compounds · CPC title

• C01B39/04

  using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B01D71/028

  Molecular sieves (carbon B01D71/021) · CPC title

• B01D2257/80

  Water · CPC title