DE2222637A1 - SUPPORTING FRAME FOR ELECTRODES OF ELECTROLYSIS DEVICES - Google Patents

Description

FARBENFABRIKEN BAYER AG LEVERKUSEN-Bperwerk

Central Area "Ma / $ 72

Patents, trademarks and licenses

Gr / Al

Holding frame for electrodes of electrolysis devices

The present invention relates to a device in which the electrically insulated holding frame of an electrolysis unit (Electrolyser) with the electrodes, preferably electrode plate ^ are particularly favorably connected.

It is known to use electrically conductive electrode plates in insulating Putty existing plastic frames. Such a connection of the holding frame of an electrolysis unit (electrolyser) with the electrodes, however, has serious disadvantages. There may be frequent interruptions during electrolysis come because the temperature differences that occur as a result of different expansion coefficients of Plastic and electrode material in the cement can crack and leak.

A second known type of connection of the holding frame and electrodes consists in the so-called form-fitting connection. This means a connection between the holding frame and the electrode using a tongue and groove »Such a connection However, it still requires a certain amount of play when the electrolysis temperature is increased, which leads to leaks when the temperature is reduced and transfer of the liquid from one chamber to the other

Le A 14 236 - 1 -

309848/0539

can lead.

It is one of the objects of the present invention to address the disadvantages to avoid the previously known methods and a suitable combination of the consisting of different materials To find holding frames and electrode plates. In particular, it should be a device in which the described Disadvantages of the temperature change, which inevitably has to take place when the electrolysis device is started up and shut down, do not occur. In addition, the device according to the invention should enable the use of materials that relate to their behavior towards acids to be electrolyzed and other aggressive substances appeared to be suitable, but in the previously known devices as a result of their large expansion coefficients could not be cemented to the electrode plates.

A device for the electrolysis of hydrochloric acid and chloralkali has now been found, which is characterized by that a positive connection of current-carrying electrodes (2) with the electrolyzer single frame (1, 8, 10, 11, 12 ... by arranging the electrodes with their ends in corresponding Setbacks of the electrolyser single frame is made, the electrodes with appropriate seals (13) provided and held by the clamping screws (9) that hold the electrolyser together.

With the non-positive connection of the electrodes according to the invention The electrode plates - anodes and cathodes - are neither cemented in with the enclosing electrolyzer frame still held in a form fluid by a fit, but are resiliently between the clamping screws of the electrolyzer clamped in the electrolyzer frame.

Le A 14 236 - 2 -

309848 / 0S99

3 2222837

The device according to the invention is suitable for electrolysis in an aqueous medium, for example for hydrochloric acid and chloralkali electrolysis. In a particularly favorable way can these electrolyses according to the diaphragm process using so-called bipolar electrodes in the invention Perform device. The electrodes are preferably carbon electrodes.

In the following, the device according to the invention will be explained in more detail with reference to two drawings. The 1st drawing represents an electrolysis unit (electrolyser) and the 2nd drawing a part of the electrolysis unit the cathode of the previous cell 3 is the anode of the next cell 4 (bipolar electrode) etc. To separate the anode compartments 5 from the cathode compartments, diaphragms 7 are used pressed, etc. The electrodes lying between the frames are held in their position by elastic seals 13, the expansion of the materials in the transverse direction being elastically absorbed by the tensioning screws 9. At right angles to this, the frames can expand or contract as desired without any negative effect on the connection between the holding frame and the electrodes in the temperature range. For easy mounting of the electrodes, pins 14 made of plastic are inserted into the individual electrolyser frames at the bottom and top, and these pins fit into corresponding recesses 15 of the electrodes. This prevents the electrode plate from falling out of the frame during assembly. However, the pins must have enough room to move in the recesses mentioned that they also have the necessary play ^{in the operating state, for example at SO 0 G.}

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309848/0599

The advantages of the device according to the invention are that the previous occurrence of cracks in the cement and thus the loosening of the electrode plates is avoided and continues to do so the frames can be easily replaced without destroying the electrode plates.

Le A 14 236 - 4 -

309848/0599

Claims (1)

Claim: Device for the electrolysis of hydrochloric acid and chloralkall, characterized in that a non-positive connection of current-carrying electrodes (2) with the single electrolyzer frame (1, S, 10, 11, 12; ....) by arranging the Electrodes are made with their ends in corresponding recesses of the electrolyzer single frame, the Provide electrodes with appropriate seals (15) and are held by the clamping screws (9) holding the electrolyser together. Le A 14 236 -5- 309848/0599