JP2000282282A - Electrolytic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic tank using a gas diffusion electrode, and capable of completely preventing the leakage of a caustic solution using a chamber simple in structure, and easy in corrosion resistant metal plating. SOLUTION: In the electrolytic tank, an upper chamber 17 as a caustic solution outlet, and a lower chamber 16 as a caustic solution inlet are provided through caustic solution passages 12, 13 with a spacer therein on an outer end of an electrolytic tank comprising a gas chamber 8 having oxygen gas inlet and outlets 6, 7 for a gas diffusion electrode 9 in contact with oxygen gas inlet and outlets 4, 5 of upper and lower chambers provided on the center side along a surface of a cathode collector frame 3 adjacent to a cathode element 1, and a cathode chamber 11 filled with the caustic solution between the gas diffusion electrode 9 and an ion-exchange membrane 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic cell using an oxygen cathode used for ion exchange membrane method salt electrolysis and the like.
More particularly, it relates to an electrolytic cell for effectively supplying and discharging a caustic liquid.

[0002]

2. Description of the Related Art A conventional electrolytic cell using a gas diffusion electrode is composed of a cathode element, a cathode current collecting frame, a caustic chamber frame, and the like, which are assembled with a gasket interposed therebetween. It is supplied and discharged from the liquid inlet and outlet of a caustic chamber provided in the element. Moreover, this electrolytic cell required a gasket.

[0003]

For this reason, this electrolytic cell has a complicated structure, and there is a problem that leakage of caustic liquid is likely to occur due to a decrease in the sealability of a joint portion of each member, for example, a gasket. there were. Also, the caustic chamber of the cathode element may cause electrolytic corrosion. In this case, in order to prevent corrosion of the caustic chamber, Na such as silver is used.
There is also a problem that plating with a metal having corrosion resistance to OH is structurally difficult.

The present invention has been made in view of such conventional problems, and uses a chamber which has a simple structure, can use a conventional electrolytic cell as it is, and can easily perform anticorrosion metal plating. It is another object of the present invention to provide an electrolytic cell using a gas diffusion electrode that can completely prevent leakage of caustic liquid.

[0005]

According to the present invention, the following electrolytic cell is provided to achieve the above object of the present invention. (1) In an electrolytic cell using an oxygen cathode composed of an anode, an ion exchange membrane, and a gas diffusion electrode, an oxygen gas inlet / outlet of an upper / lower chamber provided at the center side along the surface of the cathode current collecting frame adjacent to the cathode element. An upper chamber as a caustic liquid outlet is provided at the outer end of an electrolytic cell comprising a gas chamber having an oxygen gas inlet / outlet of a gas diffusion electrode and a cathode chamber in which a caustic liquid enters between the gas diffusion electrode and the ion exchange membrane. An electrolytic cell provided with a caustic chamber frame connecting a lower chamber as a caustic liquid inlet through a caustic liquid passage. (2) The caustic liquid passage from each chamber is formed between parallel plate members having a narrow space, and spacers are provided at a distance of 10 to 100 mm for uniform distribution of the caustic liquid and for securing strength. The electrolytic cell according to (1), wherein:

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings in which a preferred embodiment of the present invention is applied to a monopolar electrolytic cell. However, the present invention is not limited to this and can be applied to a bipolar electrolytic cell. FIG. 1 is a sectional view showing an embodiment of the present invention. An oxygen gas inlet 4 for the upper gas chamber and an oxygen gas outlet 5 for the lower chamber are provided at the center along the surface of the cathode current collecting frame 3 adjacent to the cathode element 1 of the electrolytic cell. A gas chamber 8 filled with a corrugated mesh between a cathode current collector frame 3 having an oxygen gas inlet 4 and an outlet 5 in contact with the oxygen inlet and outlet and a gas diffusion electrode 9; a gas diffusion electrode 9 and an ion exchange membrane 10; Constitutes the cathode chamber 11 into which the caustic liquid enters.

A gasket for preventing caustic liquid or oxygen gas is inserted between the cathode current collecting frame 3 and the cathode element 1 for sealing. The gasket for the seal can be used without any particular limitation as long as it is an alkali-resistant gasket. For example, synthetic rubber, plastic, and the like can be preferably used.

On the other hand, at the outer end of the cathode portion of the electrolytic cell thus constructed, an upper chamber 1 is provided as a caustic liquid outlet.
The lower chamber 16 is disposed apart from the upper and lower ends of the cathode chamber 11 via the caustic liquid passages 13 and 12, respectively. Each of the caustic liquid passages 12 and 13
It is preferable to form the upper and lower frames of a frame plate arranged in parallel at a narrow interval so as to form a narrow cathode chamber. The interval 10 is used for the purpose of equalizing the dispersion of the caustic liquid and ensuring the strength. Spacers are arranged at １００100 mm. Further, a gasket 14 is inserted between the spacer-type caustic liquid passages 12 and 13 and the cathode current collecting frame 3, and a gasket 15 is inserted between the spacers and the ion exchange membrane 10, and sealed to prevent caustic liquid wetting. I have. In addition, as the material of the gasket, the above-described alkali-resistant gasket can be used without particular limitation.

The upper chamber 16 and the lower chamber 17 of the cathode chamber 11 are made of a metal plate previously plated with a metal such as silver having corrosion resistance against caustic soda by sheet metal processing so as to face the inner side. It can be easily manufactured and has excellent corrosion resistance to caustic liquid, so that the upper and lower chambers 16 and 17 are not likely to cause electrolytic corrosion. Further, in sheet metal processing, the cathode chamber frame 2
And it may be formed integrally.

As shown in FIG. 1, in the embodiment of the present invention, an electrolytic solution is supplied from a lower part and rises to an upper part. That is, the caustic liquid is supplied from the lower chamber 16 of the cathode chamber 11, enters the caustic chamber 11 from the caustic liquid passage 12, rises in the caustic chamber 11, and is discharged from the upper chamber 17 via the caustic liquid passage 13.

[0011]

According to the electrolytic cell of the present invention, not only leakage of the caustic solution can be prevented, but also the anticorrosion plating of the upper chamber and the lower chamber can be easily performed, so that the electrolytic corrosion does not occur in the caustic chamber. . Further, by disposing the spacer in the caustic liquid passage communicating the cathode chamber with the upper chamber and the lower chamber, uniform distribution and smooth distribution of the caustic liquid can be achieved. In addition, the upper chamber,
Since the lower chamber is provided outside the electrolytic cell, it can be modified without changing the internal structure of the conventional electrolytic cell.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an electrolytic cell using a gas diffusion electrode of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cathode element 2 Caustic chamber frame 3 Cathode current collecting frame 4,6 Oxygen gas inlet 5,7 Oxygen gas outlet 8 Gas chamber 9 Gas diffusion electrode 10 Ion exchange membrane 11 Cathode chamber 12,13 Caustic liquid passage 14,15 Gasket 16 Lower part Chamber 17 Upper chamber

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000105040 Chlorine Engineers Co., Ltd. 2-6-111 Fukagawa, Koto-ku, Tokyo Tomiokabashi Building (72) Inventor Akihiro Sakata 1-14-1 Nishishinbashi, Minato-ku, Tokyo (72) Koji Saiki, Inventor 3-4-2 Nakanoshima, Kita-ku, Osaka-shi, Osaka Prefecture Kanebuchi Chemical Industry Co., Ltd. (72) Hiroaki Aikawa 3-2-2 Kasumigaseki, Chiyoda-ku, Tokyo, Japan No. 5 Inside Mitsui Chemicals, Inc. (72) Inventor Shinji Katayama 24-6 Higashi-Takasaki, Tamano-shi, Okayama Prefecture Inside Chlorine Engineers Co., Ltd. (72) Kenzo Yamaguchi 5-6-1, Tsukiji, Chuo-ku, Tokyo Consulate F-term in PT Engineers Co., Ltd. (reference) 4K011 AA12 DA03 4K021 BA03 CA08 CA09 DB16 DB31 DB46

Claims (2)

[Claims] 1. An electrolytic cell using an oxygen cathode comprising an anode, an ion exchange membrane and a gas diffusion electrode, wherein oxygen gas in upper and lower chambers provided at the center side along the surface of the cathode current collecting frame adjacent to the cathode element. A gas chamber having an oxygen gas inlet / outlet of the gas diffusion electrode in contact with the inlet / outlet, a cathode chamber into which the caustic liquid enters between the gas diffusion electrode and the ion exchange membrane, and an upper end serving as a caustic liquid outlet at the outer end of the electrolytic cell. An electrolytic cell having a caustic chamber frame, wherein the chamber is a caustic liquid inlet and the lower chamber is connected via a caustic liquid passage. 2. A caustic solution passage from each chamber is formed between parallel plate members having a narrow space, and a space of 10 to 100 mm is provided for uniformity of dispersion of the caustic solution and securing of strength.
The electrolytic cell according to claim 1, wherein a spacer is provided on the cell.