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Title
Verfahren zur kontinuierlichen Entfernung und Gewinnung von Chelatbildungsmitteln aus Prozesswaessern
Date Issued
1994
Author(s)
Patent No
1989-3929121
Abstract
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.
Language
de
Patenprio
DE 1989-3929121 A: 19890901