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Verfahren zur kontinuierlichen Entfernung und Gewinnung von Chelatbildungsmitteln aus Prozesswaessern

Process for the continuous removal and recovery of chelate forming agents from process water
: Bauer, B.; Strathmann, H.

Frontpage ()

DE 1989-3929121 A: 19890901
DE 1989-3929121 A: 19890901
EP 1990-114916 A: 19900803
DE 3929121 C1: 19910228
EP 415119 B1: 19940330
Patent, Electronic Publication
Fraunhofer IGB ()

The invention relates to a process for the continuous removal and recovery of chelating agents from process waters. To this end, the process water containing the chelating agent is directed into an electrodialysis cell which is fitted with alternate bipolar membranes and anion exchange membranes and/or cation exchange membranes, and to which a potential difference is applied. The chelating agent is transformed into its neutral charge form by means of protonation and the protons required for this purpose are produced using bipolar membranes through electrodialysis. The required pH is adjusted by means of pH-controlled voltage regulation by means of the bipolar membranes.