| 摘要 |
<p>For the electrochemical production of ozone, monopolar electrolysis cells of low capacity, using anodes coated with diamond or lead oxide, are known, which preferably have a mechanical device for pressing the anode against the ion exchange membrane, which functions as a solid electrolyte. It is an object of the invention to make an electrolysis cell of high electric current capacity available, for which it becomes possible to connect several, individual bipolar cells of larger anode surface in series by means of an integrated contacting device. According to the invention, the electrolysis cell consists of a basic electrode body (1) of impregnated graphite, on the cathode side of which the cathode gaps are incorporated in the form of vertical cathode channels, which are connected at the top and at the bottom by a transverse channel. At the same time, the ribs bring about the electrical contact with the gas diffusion layers (3) (GDL), which have been pressed on there. If the GDL is activated appropriately, oxygen reduction takes place cathodically. Sealing frames (4) of a flexible plastic seal the GDL at the sides. The anode and cathode gaps are separated by solid electrolyte cation exchange membranes (5). On the anode side, the punctured, structured anode plates (6), which consist, for example, of a diamond-coated niobium expanded metal, are pressed against the membrane. They are bonded in hard frames (7), for example, of PVC-C and contacted by contacting elements (8) with the adjoining basic graphite body, which is protected by insulating films (9) of PTFE from corrosion by ozone. The contacting mechanisms for the anode plates are integrated in the anode sides of the basic electrode bodies. They consist of flexible intermediate layers (10) and rigid contacting plates (11), as well as of the contacting tubes (12). The contacting tubes of all individual bipolar cells are connected with a pneumatic or hydraulic system, by means of which the contacting plates distribute the contacting pressure on the anode plates over the flexible intermediate layers uniformly on all individual cells and, in so doing, equalize thickness tolerances. The inlets and outlets for the electrolysis media (13-18) are integrated in the basic electrode body and the hard frames. The electric current is supplied only to the edge plates (19, 20). The invention enables relatively large amounts of ozone to be generated while a uniform contacting pressure is maintained over the pneumatic/hydraulic system on all anode plates of the bipolar electrolyzer and, with that, the invention also enables the specific electron energy consumption to be minimized. The invention makes possible an efficient oxidative treatment of water and aqueous solutions for disinfection and decomposition of pollutants.</p> |
