Electrolytic cell for producing nitrogen trifluoride gas and partition therefor

Patent metadata

Field	Value
Publication number	US-11401614-B2
Application number	US-201816646064-A
Country	US
Kind code	B2
Filing date	Oct 24, 2018
Priority date	Oct 31, 2017
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

An electrolytic cell has a partition that covers an upper region of one electrode of an anode and a cathode in order to separate a gas generated from the anode and a gas generated from the cathode from each other. The partition has wall surfaces that are each opposite a surface of the electrode. The wall surfaces have, in lower end-side regions thereof, ribs extending in a direction that has a lateral direction component. The ribs and the partition are made of a fluororesin and are integrally formed.

First claim

The invention claimed is:

1. An electrolytic cell for producing nitrogen trifluoride gas, comprising:
a partition that covers an upper region of one electrode of a cathode and an anode in order to separate a gas generated from the anode and a gas generated from the cathode from each other,
wherein the partition has, in a lower end-side region thereof, a plurality of ribs extending in a direction that has a lateral direction component, and
the ribs and the partition are made of a fluororesin and are integrally formed.

2. The electrolytic cell as set forth in claim 1 , wherein the partition does not have a metal plate or another separable fluororesin plate.

3. The electrolytic cell as set forth in claim 1 , wherein the ribs are provided on a surface of the partition that is parallel to a surface of the electrode.

4. The electrolytic cell as set forth in claim 1 , wherein the partition and the ribs surround the upper region of the electrode.

5. The electrolytic cell as set forth in claim 1 , which has a plurality of ribs on a one surface of the partition.

6. The electrolytic cell as set forth in claim 5 , wherein two or more ribs are present, the ribs being formed into an annular shape so as to surround a perimeter of the partition.

7. The electrolytic cell as set forth in claim 1 , wherein a ratio (W/T) of a rib width W to a partition thickness T is from 0.5 to 10.

8. The electrolytic cell as set forth in claim 7 , wherein the ratio (W/T) of the rib width W to the partition thickness T is from 1 to 5.

9. The electrolytic cell as set forth in claim 1 , wherein a ratio (W/T) of a rib height H to a partition thickness T is 0.5 or greater.

10. The electrolytic cell as set forth in claim 9 , wherein the ratio (H/T) of the rib height H to the partition thickness T is from 1 to 5.

11. The electrolytic cell as set forth in claim 1 , wherein a ratio (D 2 /T) of an inter-rib distance D 2 to a partition thickness T is from 0.1 to 20.

12. The electrolytic cell as set forth in claim 11 , wherein the ratio (D 2 /T) of the inter-rib distance D 2 to the partition thickness T is from 0.1 to 10.

13. The electrolytic cell as set forth in claim 1 , wherein the ribs are provided at positions that are spaced upward from a lower end of the partition.

14. The electrolytic cell as set forth in claim 13 , wherein a ratio (D 1 /T) of a distance D 1 between a lower end of a rib that is located the nearest to the lower end of the partition and the lower end of the partition to a partition thickness T is from 0 to 5.

15. A partition for an electrolytic cell for producing nitrogen trifluoride gas, the partition being configured to be used to cover an upper region of one electrode of an anode and a cathode of the electrolytic cell for producing nitrogen trifluoride gas,
wherein the partition is used with one end side thereof being fixed to an upper portion of the electrolytic cell, and has, on a wall surface on another end side thereof, a plurality of ribs extending in a direction that has a direction component that is perpendicular to a direction in which the two end portions are opposite each other, and
the partition is made of a fluororesin and is integrally formed with the ribs.

16. The electrolytic cell as set forth in claim 1 , wherein the ribs and the partition are integrally formed by integrally molding.

17. The electrolytic cell as set forth in claim 1 , wherein the plurality of ribs are different in a distance D 1 to a lower end of the partition.

18. The electrolytic cell as set forth in claim 16 , wherein the plurality of ribs are different in a distance D 1 to a lower end of the partition.

19. The electrolytic cell as set forth in claim 5 , wherein the plurality of ribs on the one surface of the partition extend parallel to one another.

20. The electrolytic cell as set forth in claim 1 , wherein the partition has four inner surfaces surrounding the electrode and four outer surfaces respectively paired with the four inner surfaces, and at least one of the four inner surfaces and the four outer surfaces has a plurality of ribs.

21. The electrolytic cell as set forth in claim 20 , wherein the plurality of ribs and the partition are integrally formed, without attaching the plurality of ribs to the partition by welding.

Assignees

• Kanto Denka Kogyo Kk

Inventors

• Okubo Kimitaka
• Imao Shujiro

Classifications

• C25B1/245 Primary

  Fluorine; Compounds thereof · CPC title

• C25B9/19

  with diaphragms · CPC title

• C25B13/08

  based on organic materials · CPC title

• C25B13/02 Primary

  characterised by shape or form · CPC title