Preparation of aqueous hydroxylamine solutions

US4645579A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz-Josef Weiss · Schifferstadt, DE
• Wolfgang Habermann
• Peter Hammes · Ruppertsberg, DE
• Elmar Frommer · Ludwigshafen, DE
• Erwin Thomas · Freinsheim, DE
• Peter Thoma · Mannheim, DE

Key dates

• Filing date: Dec 24, 1984
• Grant date: Feb 24, 1987
• Expiry date: Dec 24, 2004

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D61/44
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Aqueous solutions of hydroxylamine are prepared from aqueous hydroxylammonium salt solutions by electrodialysis by a method in which the aqueous hydroxylammonium salt solution is fed into the middle zone of an electrolysis cell, which is divided into a cathode zone, an anode zone and a middle zone by means of semipermeable membranes, and is electrolyzed, and the catholyte used is an alkali metal hydroxide solution containing ammonia and/or amines.