JPH0517315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an ion exchange membrane that ensures smooth flow of electrolyte in the anode chamber of an ion exchange membrane electrolytic cell in which two or more anodes are housed in a bag-like molded body. Regarding legal electrolyzers.

One or more anodes are housed in a bag-like molded body made of an ion exchange membrane, the electrolytic cell is divided into an anode chamber and a cathode chamber by the bag-like molded body, and brine is supplied to the anode chamber, and the cathode chamber An ion-exchange membrane electrolytic cell for obtaining caustic soda is well known (Japanese Patent Laid-Open No. 1983
-41386, JP-A-58-91179). In this type of electrolytic cell, the power supply rod installed upright on the bottom plate of the electrolytic cell and the mesh-shaped anode structure are not in close contact with each other.
When an electrolytic solution (saline solution) is supplied to any part of the anode chamber using a manifold or the like, the electrolytic solution circulates within the anode chamber including between the power supply rod and the anode structure.
In some cases, the electrolyte may not be sufficiently circulated in locations far from the electrolyte supply pipe. In particular, when using a so-called box-type anode, that is, an anode with a structure in which the power supply rod and the anode structure are closely fixed, the electrolyte does not flow between the power supply rod and the anode structure, and the electrolyte flows only near the upper and lower ends of the power supply rod where no anode structure is present. Therefore, if the electrolytic solution is supplied to any part of the anode chamber, the electrolytic solution will not be sufficiently circulated and the electrolytic efficiency will decrease.

The present invention particularly relates to an ion exchange membrane electrolytic cell using a box type anode, in which an electrolytic solution is supplied to required locations in the anode chamber to maximize circulation of the electrolytic solution.

That is, the present invention provides two or more power supply rods that are installed upright on the bottom plate of an electrolytic cell, and a cylindrical anode structure that is connected to each of the two or more power supply rods and in which the power supply rod is located. The anode is accommodated in a bag-like molded body formed of an ion exchange membrane to constitute a plurality of anode chambers, and a cathode chamber is constituted between adjacent anode chambers, and for each anode chamber in the upper part of the electrolytic cell body, A manifold with two electrolyte supply pipes and an electrolyte take-out pipe is installed, with the lower ends of the two electrolyte supply pipes located outside the outermost power supply rod, and the electrolyte take-out pipe between both supply pipes. This is an ion-exchange membrane method electrolytic cell characterized by being installed in such a way that the

The present invention will be described in more detail below based on an embodiment of the present invention shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional front view showing an embodiment of an ion exchange membrane electrolytic cell according to the present invention, and FIG. 2 is a plan view taken along the line ``--'' in FIG. 1.

Inside the electrolytic cell body 1, a plurality of porous and hollow cathodes 2 extend from one inner side wall 3 of the electrolytic cell body 1 to an opposite inner side wall 3'. A hole 6 through which the lower part of the power supply rod 5 passes is bored in the middle position between two adjacent cathodes 2 on the bottom plate 4 of the electrolytic cell.
The power supply rod 5 is erected on the electrolytic cell bottom plate 4 by tightening the lower end with a nut 7.

The portion between the power supply rod 5 and the bag-shaped molded exchange membranes (to be described later) located on both sides of the power supply rod 5, excluding the vicinity of both upper and lower ends of the power supply rod, is provided with a porous and rectangular cylindrical shape with openings on both upper and lower sides. The inner surface of the anode structure 8 is tightly fixed. Inside the anode structure 8, in the vicinity of both left and right ends, there is a non-perforated flat plate or mesh-shaped plate which spans between both inner surfaces of the anode structure 8 and whose length in the vertical direction is slightly shorter than the length in the vertical direction of the anode structure 8. An auxiliary plate 9 is installed, and a cylindrical conduit 10 with an open top and bottom is installed between the auxiliary plate 9 and the inner surfaces of the power supply rod 5 and the anode structure 8 so as to wrap around the power supply rod 5. . Inside the anode chamber outside the power supply rod 5, the conduit 10 and the auxiliary plate 9 include the inside of the conduit 10, a portion surrounded by the conduit 10, the auxiliary plate 9, and the anode structure 8, and the auxiliary plate 9 and the anode structure. It is divided into parts surrounded by 8 "U" shaped parts. Note that an anode 11 is constituted by the power supply rod 5, the anode structure 8, the auxiliary plate 9, and the conduit 10.

A pair of anodes 11 are closely housed in a bag-like molded body 12 formed of a cation exchange membrane and having an open top surface, and an anode chamber is formed within the bag-like molded body 12 . Furthermore, a protective frame 13 of the boat-shaped bag-shaped molded body 12 is installed between the lower end of the anode 11 and the inner surface of the bag-shaped molded body 12 in a portion that contacts the electrolytic cell bottom plate 4 .

A separation plate 16 in which a long hole 15 corresponding to the opening on the top surface of the bag-like molded body 12 is bored is placed on the top surface of the electrolytic cell body 1 via a sponge gasket 14. The upper surface opening is the separation plate 16
The elastic sheet 17 is in contact with the elongated hole 15 of the cell, and the lid body 19 has three holes 18 in the left and right direction, and the periphery thereof is bent upward. There is.

A manifold 22 is disposed above the electrolytic cell body 1 and has a downwardly directed electrolyte take-out pipe 20 and a pair of left and right electrolyte supply pipes 21 that face obliquely downward. Electrolyte outlet pipe 2 of manifold 22
0 fits into the hole 18 in the center of the lid 19, and a pair of electrolyte supply tubes 21 pass through the holes 18 on both sides of the lid 19, and their lower ends are connected to the outside of the power supply rod 5. It has reached the anode chamber.

When the electrolyte is supplied from the two electrolyte supply pipes 21 to the apparatus of this embodiment having such a configuration, the electrolyte is supplied to the area outside the outermost power supply rod 5 of the anode chamber, and As shown by the arrows in the figure, after circulating up and down the above-mentioned and sections, it moves to the inner area of the power supply rod 5 through the vicinity of both the upper and lower ends of the power supply rod 5, and after circulating in this area. , is taken out from the electrolyte take-out pipe 20 to the manifold 22.

In this embodiment, two anodes 11 are housed in one bag-shaped molded body 12, but the present invention is not limited to this, and three or more anodes are housed in one bag-shaped molded body. In this case, the lower ends of each of the pair of electrolyte supply pipes may be positioned outside the outermost power supply rod. Further, the bag-shaped molded body does not need to be entirely formed of a cation exchange membrane, but it is sufficient that at least the portions facing the anode and cathode are formed of a cation exchange membrane.

The present invention accommodates two or more anodes in a bag-like molded body, supplies an electrolytic solution to the outer area of each of the outermost pair of power feeding rods, and takes out the electrolytic solution from between the two feeding rods. Therefore, the electrolyte is sufficiently circulated and electrolyzed even in the area outside the outermost power supply rod, and then circulated inside the power supply rod through the vicinity of the power supply rod and taken out. In other words, the ion-exchange membrane electrolytic cell according to the present invention allows the electrolyte to circulate smoothly without stagnation, and is particularly advantageous when using a box-type anode in which the electrolyte is difficult to circulate smoothly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of an ion exchange membrane electrolytic cell according to the present invention, and FIG. 2 is a plan view taken along the line ``--'' in FIG. 1. 1... Electrolytic cell main body, 2... Cathode, 4... Electrolytic cell bottom plate,
5... Power supply rod, 8... Anode structure, 11... Anode, 12
... Bag-shaped molded body, 20 ... Electrolyte extraction pipe, 21 ... Electrolyte supply pipe, 22 ... Manifold.

Claims (1)

[Claims] 1. Two or more anodes consisting of two or more power supply rods installed upright on the bottom plate of the electrolytic cell and a cylindrical anode structure connected to each of the two or more power supply rods and in which the power supply rod is located, are connected to the ion A plurality of anode chambers are constructed by being accommodated in a bag-like molded body formed of an exchange membrane, and a cathode chamber is constructed between adjacent anode chambers, and an electrolyte supply pipe is provided for each of the anode chambers on the upper part of the electrolytic cell main body. 2
A manifold having a main body and an electrolyte take-out pipe was installed so that the lower ends of the two electrolyte supply pipes were located outside the outermost power supply rod, and the electrolyte take-out pipe was located between the two supply pipes. An ion exchange membrane method electrolytic cell characterized by the following.