公开(公告)号：ID29240A

公开(公告)日：2001-08-16

申请号：ID20011283

申请日：1999-12-06

Applicant: BASF AG

Inventor： BOTZEM JORG DR ,  KOBER REINER DR ,  FREDE MARKUS DR

IPC: B01D61/46 ,  B01D61/44 ,  C02F1/469 ,  C07C209/68 ,  C07C209/84 ,  C07C211/63 ,  C07F9/54 ,  C25B3/00

Abstract: Methods of preparing or purifying onium hydroxides of the elements N, S or P by electrodialysis involve an electrodialysis apparatus comprising one or more cell units, each cell unit comprising a bipolar membrane and an anion-selective membrane, and a bipolar membrane or a cation-selective membrane being located on the anode side between the last anion-selective membrane and the anode.