Activated carbon fiber, activated carbon fiber formed body, and method for producing thereof, organic solvent adsorption/desorption device, organic solvent recovery system, method for adsorbing/desorbing organic solvent, and method for recovering organic solvent

Patent metadata

Field	Value
Publication number	US-11975974-B2
Application number	US-202218283321-A
Country	US
Kind code	B2
Filing date	Mar 10, 2022
Priority date	Mar 23, 2021
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

An activated carbon fiber is obtained by activating: a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position; an infusibilized polyphenylene ether fiber obtained by infusibilizing the polyphenylene ether fiber; a flameproofed polyphenylene ether fiber obtained by flameproofing the polyphenylene ether fiber or the infusibilized polyphenylene ether fiber; or a carbon fiber obtained by carbonizing any of the polyphenylene ether fibers.

First claim

The invention claimed is:

1. An activated carbon fiber obtained by activating:
a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position;
an infusibilized polyphenylene ether fiber obtained by infusibilizing the polyphenylene ether fiber;
a flameproofed polyphenylene ether fiber obtained by flameproofing the polyphenylene ether fiber or the infusibilized polyphenylene ether fiber; or
a carbon fiber obtained by carbonizing any of the polyphenylene ether fibers.

2. The activated carbon fiber according to claim 1 ,
wherein:
the repeating unit continuously bonded at a para-position is represented by the following general formula (1):

wherein: R 1 and R 2 are each independently a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent; and R 3 is each independently a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent; and
the rearrangement structure is represented by the following general formula (2):

wherein: R 1 and R 2 are each independently a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent; R 3 is each independently a hydrocarbon group having 1 to 10 carbon atoms which may have a substituent; and R 3 ′ represents a divalent group in which one hydrogen atom is removed from R 3 .

3. The activated carbon fiber according to claim 1 , wherein an amount of rearrangement in the polyphenylene ether component having the rearrangement structure is 0.01 mol% or more with respect to all polyphenylene ether structural units in the polyphenylene ether component.

4. The activated carbon fiber according to claim 1 , wherein a content of the polyphenylene ether component is 95% by mass or more in the polyphenylene ether fiber.

5. The activated carbon fiber according to claim 1 , wherein the rearrangement structure exhibits peaks in a range of 6.8 to 7.0 ppm and a range of 3.8 to 4.0 ppm in nuclear magnetic resonance spectrum ( 1 H-NMR) measurement.

6. The activated carbon fiber according to claim 1 , wherein an amount of radicals in the polyphenylene ether fiber is 50 g −1 or more.

7. The activated carbon fiber according to claim 1 , wherein the polyphenylene ether fiber has a glass transition temperature of 190° C. or higher and 210° C. or lower.

8. An activated carbon fiber formed body comprising the activated carbon fiber according to claim 1 .

9. The activated carbon fiber formed body according to claim 8 , wherein the activated carbon fiber formed body is an activated carbon fiber nonwoven fabric.

10. The activated carbon fiber formed body according to claim 9 , wherein the activated carbon fiber nonwoven fabric has tensile strength of 4 N/cm 2 or more.

11. A method for producing an activated carbon fiber according to claim 1 , comprising the steps of:
producing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position; and
activating the polyphenylene ether fiber.

12. A method for producing an activated carbon fiber according to claim 1 , comprising the steps of:
producing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position;
infusibilizing the polyphenylene ether fiber to produce an infusibilized polyphenylene ether fiber; and
activating the infusibilized polyphenylene ether fiber.

13. A method for producing an activated carbon fiber according to claim 1 , comprising the steps of:
producing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position;
flameproofing the polyphenylene ether fiber to produce a flameproofed polyphenylene ether fiber; and
activating the flameproofed polyphenylene ether fiber.

14. A method for producing an activated carbon fiber according to claim 1 , comprising the steps of:
producing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position;
infusibilizing the polyphenylene ether fiber to produce an infusibilized polyphenylene ether fiber;
flameproofing the infusibilized polyphenylene ether fiber to produce a flameproofed polyphenylene ether fiber; and
activating the flameproofed polyphenylene ether fiber.

15. A method for producing an activated carbon fiber formed body according to claim 8 , comprising the steps of:
processing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position to produce a polyphenylene ether fiber formed body; and
activating the polyphenylene ether fiber formed body.

16. A method for producing an activated carbon fiber formed body according to claim 8 , comprising the steps of:
processing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position to produce a polyphenylene ether fiber formed body;
infusibilizing the polyphenylene ether fiber formed body to produce an infusibilized polyphenylene ether fiber formed body; and
activating the infusibilized polyphenylene ether fiber formed body.

17. A method for producing an activated carbon fiber formed body according to claim 8 , comprising the steps of:
processing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position to produce a polyphenylene ether fiber formed body;
flameproofing the polyphenylene ether fiber formed body to produce a flameproofed polyphenylene ether fiber formed body; and
activating the flameproofed polyphenylene ether fiber formed body.

18. A method for producing an activated carbon fiber formed body according to claim 8 , comprising the steps of:
processing a polyphenylene ether fiber that contains a polyphenylene ether component having a rearrangement structure connected by a bond at an ortho-position in a repeating unit continuously bonded at a para-position to produce a polyphenylene ether fiber formed body;
infusibilizing the polyphenylene ether fiber formed body to produce an infusibilized polyphenylene ether fiber formed body;

flameproofing the infusibilized polyphenylene ether fiber formed body to produce a flameproofed polyphenylene ether fiber formed body; and
activating the flameproofed polyphenylene ether fiber formed body.

19. An organic solvent adsorption/desorption device that cleans a gas to be treated by adsorbing and removing an organic solvent from the gas to be treated containing the organic solvent, and desorbs the adsorbed organic solve

Assignees

• Toyobo Mc Corp

Inventors

• Okada Takemasa
• Yasui Akifumi
• Hojo Kenta

Classifications

• C01B32/318 Primary

  characterised by the starting materials · CPC title

• B01D53/04

  with stationary adsorbents {(B01D53/025 takes precedence)} · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title

• B01J20/28023

  Fibres or filaments (fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence) · CPC title

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title