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Abstract

An electrodialysis device (10), which, in particular, is employed for the purpose of adjusting the pH value of the lacquer liquid in a cataphoretic dip-lacquering plant, comprises a plurality of electrodialysis cells (16, 17) connected to one another in parallel, which in known manner each have two chambers (14) separated from one another by an ion-specific membrane (34). The individual electrodialysis cells (16, 17) are constructed analogously to one another and are arranged in a stack. They are each composed of plate-like elements (20a, 20b, 22a, 22b, 34) arranged alongside one another. Plate-like elements (20a, 20b) of a first type form electrodes, whereas plate-like elements (22a, 22b) of a second type form spacing elements which have a recess in the interior region and in this way laterally delimit a chamber (14). Within each electrodialysis cell (16, 17) a sequence is formed which consists of one plate-like element (20a) of the first type and two plate-like elements (22a, 22b) of the second type with an ion-specific membrane (34) arranged in between. This electrodialysis device (10) can be assembled inexpensively from very few different parts and can be readily varied in its capacity through the choice of the number of electrodialysis cells (16, 17) in the stack.

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First Claim