Method for inspecting separation membrane structure, method for manufacturing separation membrane module, and method for manufacturing separation membrane structure

Patent metadata

Field	Value
Publication number	US-2019391064-A1
Application number	US-201916562671-A
Country	US
Kind code	A1
Filing date	Sep 6, 2019
Priority date	Mar 30, 2017
Publication date	Dec 26, 2019
Grant date	—

Abstract

A method for inspecting a separation membrane structure includes an assembly step of sealing a separation membrane structure that includes a porous substrate and a separation membrane into a casing, and an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane.

First claim

1 . A method for inspecting a separation membrane structure having a porous substrate and a separation membrane, the method comprising:
an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane, and wherein the inspection liquid is characterized in that a reduction rate of an He permeation rate of the separation membrane is less than or equal to 10% when the separation membrane structure has been dried for 24 hours at 150 degrees C. after immersion in the inspection liquid for 60 minutes.

2 . The method for inspecting a separation membrane structure according to claim 1 , wherein
a leak inspection in the inspection step is performed on the basis of a pressure change in the inspection liquid.

3 . The method for inspecting a separation membrane structure according to claim 1 , wherein
the inspection liquid in the inspection step is pressurized using a pressure booster, and a leak inspection in the inspection step is performed on the basis of at least one of a discharge amount from the pressure booster, a compression amount, or an elapsed time until completion of pressurization.

4 . The method for inspecting a separation membrane structure according to claim 1 , wherein
a leak inspection in the inspection step is performed on the basis of a foaming configuration in the inspection liquid when a gas that has filled a second main surface side of the separation membrane is pressurized.

5 . The method for inspecting a separation membrane structure according to claim 1 , wherein
a vapor pressure of the inspection liquid at 25 degrees C. is greater than or equal to 1.0×10 3 Pa.

6 . The method for inspecting a separation membrane structure according to claim 1 , wherein
the inspection liquid is a fluorinated liquid.

7 . The method for inspecting a separation membrane structure according to claim 1 further comprising:
a drying step of drying the separation membrane at less than or equal to a heat resistance limiting temperature of O rings after the inspection step.

8 . The method for inspecting a separation membrane structure according to claim 1 , wherein
the separation membrane is a zeolite membrane in which SiO 2 /Al 2 O 3 is less than or equal to 200.

9 . The method for inspecting a separation membrane structure according to claim 8 , wherein
the water content ratio in the inspection liquid is less than 20%.

10 . A method for manufacturing a separation membrane module, the method comprising:
an assembly step of sealing a separation membrane structure that includes a porous substrate and a separation membrane into a casing, and an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane, and wherein the inspection liquid is characterized in that a reduction rate of an He permeation rate of the separation membrane is less than or equal to 10% when the separation membrane structure has been dried for 24 hours at 150 degrees C. after immersion in the inspection liquid for 60 minutes.

11 . A method for manufacturing a separation membrane structure, the method comprising:
a separation membrane formation step of forming a separation membrane on a surface of a porous substrate, and an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane, and wherein the inspection liquid is characterized in that a reduction rate of an He permeation rate of the separation membrane is less than or equal to 10% when the separation membrane structure has been dried for 24 hours at 150 degrees C. after immersion in the inspection liquid for 60 minutes.

Assignees

• Ngk Insulators Ltd

Inventors

• Miyahara Makoto
• Ichikawa Makiko
• Yajima Kenji
• Hagio Takeshi

Classifications

• G01N15/0826

  and measuring fluid flow rate, i.e. permeation rate or pressure change · CPC title

• G01N2015/084

  Testing filters · CPC title

• B01D63/066

  with a porous block having membrane coated passages · CPC title

• B01L2400/0403

  specific forces · CPC title

• B01L2300/0832

  cylindrical, tube shaped · CPC title