Method for producing filter

Patent metadata

Field	Value
Publication number	US-2025186915-A1
Application number	US-202318856100-A
Country	US
Kind code	A1
Filing date	Feb 21, 2023
Priority date	Apr 25, 2022
Publication date	Jun 12, 2025
Grant date	—

Abstract

A method for producing a filter in which a catalyst is supported on a filter cloth includes: preparing a catalyst slurry; adjusting a contact angle of the catalyst slurry with respect to the filter cloth by adding a surfactant to the catalyst slurry; and applying, to the filter cloth, a catalyst slurry having the contact angle adjusted.

First claim

1 .- 9 . (canceled)

10 . A method for producing a filter in which a catalyst is supported on a filter cloth, the method comprising:
preparing a catalyst slurry; adjusting a contact angle of the catalyst slurry with respect to the filter cloth by adding a surfactant to the catalyst slurry; and applying. to the filter cloth, a catalyst slurry having the contact angle adjusted, wherein the adjusting includes:
acquiring a relationship between a concentration of a surfactant contained in the catalyst slurry and the contact angle,
acquiring a relationship between the contact angle and a supported amount of a catalyst supported on the filter cloth,
specifying the supported amount of the catalyst supported on the filter cloth,
specifying, based on a relationship with the supported amount of the catalyst, a contact angle corresponding to the supported amount of the catalyst specified,
specifying, based on a relationship with the contact angle, a concentration corresponding to the contact angle specified, and
adding the surfactant to the catalyst slurry to have the concentration specified.

11 . The method according to claim 10 , wherein the surfactant is an ether type surfactant.

12 . The method according to claim 11 , wherein the ether type surfactant is polyoxyethylene alkyl ether or polyalkylene alkyl ether.

13 . The method according to claim 10 , wherein the filter cloth includes a fluorine fiber.

14 . The method according to claim 10 , wherein in the step of applying a catalyst slurry to the filter cloth, the catalyst slurry is sprayed onto the filter cloth by a spray nozzle.

15 . The method according to claim 10 , wherein a filter in which a catalyst is supported on the filter cloth is a filter applied to a plant in which an in-furnace DeNOx equipment is installed.

16 . The method according to claim 10 , wherein a filter in which a catalyst is supported on the filter cloth is a filter applied to a plant in which an exhaust gas recirculation device is installed.

17 . A method for producing a filter in which a catalyst is supported on a filter cloth, the method comprising:
preparing a catalyst slurry; adjusting a contact angle of the catalyst slurry with respect to the filter cloth by adding a surfactant to the catalyst slurry; and applying, to the filter cloth, a catalyst slurry having the contact angle adjusted, wherein the adjusting includes:
acquiring a relationship between a concentration of the surfactant contained in the catalyst slurry and the contact angle,
acquiring a relationship between the contact angle and a falling-off rate of a catalyst supported on the filter cloth,
specifying the falling-off rate of the catalyst supported on the filter cloth,
specifying, based on a relationship with the falling-off rate of the catalyst, a contact angle corresponding to the falling-off rate of the catalyst specified,
specifying, based on a relationship with the contact angle, a concentration corresponding to the contact angle specified, and
adding the surfactant to the catalyst slurry to have the concentration specified.

18 . The method according to claim 17 , wherein the surfactant is an ether type surfactant.

19 . The method according to claim 18 , wherein the ether type surfactant is polyoxyethylene alkyl ether or polyalkylene alkyl ether.

20 . The method according to claim 17 , wherein the filter cloth includes a fluorine fiber.

21 . The method according to claim 17 , wherein when applying the catalyst slurry to the filter cloth, the catalyst slurry is sprayed onto the filter cloth by a spray nozzle.

22 . The method according to claim 17 , wherein a filter in which a catalyst is supported on the filter cloth is a filter applied to a plant in which an in-furnace DeNOx equipment i installed.

23 . The method for producing a filter according to claim 17 , wherein a filter in which a catalyst is supported on the filter cloth is a filter applied to a plant in which an exhaust gas recirculation device is installed.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Katsuki Masatoshi
• Suzuki Takumi
• Kakitani Kenta
• Asai Yuki
• Akiyama Hiromichi
• Nishiguchi Kiichi

Classifications

• B01D46/0001

  Making filtering elements · CPC title

• B01J35/56

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• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• B01D2258/01

  Engine exhaust gases · CPC title

• B01D2239/0492

  on fibres · CPC title