Elektrodialytisches Verfahren zur Herstellung wäßriger Lösungen von Hydroxylamin oder von Hydroxylamin-Derivaten sowie Elektrodialysezelle zur Durchführung des Verfahrens

The invention relates to an electrodialysis process and a device for the production of aqueous solutions of hydroxylamine or hydroxylamine derivatives. From an aqueous solution of a hydroxyl ammonium salt of the general formula NH<-3 OH)->+ <-z Z->z- , where Z->z- is equal to SO<-4 ->2- , Cl->- , F->- , Br->- , NO->3- or CH<-3 COO->-, the NH<-3 OH->+ ions are removed electrodialytically via a cation exchange diaphragm. The NH<-3 OH->+ ions are converted into (NH<-3 OH)OH or NH<-2 OHxH<-2 O or NH<-2 OH by means of hydroxide ions generated electrodialytically using a bipolar diaphragm. The Z->z- ions are protonated by protons generated electrodialytically by using a bipolar diaphragm. Electrodialysis cells for performing the process according to the invention have one or several chambers K<-1 which are limited on the cathode side by a cation exchange diaphragm and in which the aqueous solution of the starting salt (NH<-3 OH)->+ <-z Z->z- is placed. The anode chamber is limited by a catio n exchange diaphragm and the cathode chamber by a bipolar diaphragm with a cation-selective layer arranged on the cathode side. Moreover, the device according to the invention has one or several chambers K<-2 which are limited on the anode side by a cation exchange diaphragm and on the cathode side by a bipolar diaphragm with a cation-selective layer arranged on the cathode side and in said chambers the transfer of the NH<-3 OH->+ ions takes place by means of ...