Preparation of an aqueous solution of free hydroxylamine

US6299734A · kind A · utility

Assignee

• BASF SE

Inventors

• Otto Watzenberger · Ludwigshafen, DE
• Peter Mauer · Kallstadt, DE
• Eckhard Ströfer · Mannheim, DE
• Heiner Schelling · Ludwigshafen, DE
• Hans-Michael Schneider · Worms, DE

Key dates

• Filing date: Jul 24, 1998
• Grant date: Oct 9, 2001
• Expiry date: Jul 24, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B21/1445
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is liberated and at the same time the solution obtained is separated by distillation into an aqueous hydroxylamine solution and a salt fraction. The novel process can be carried out in a simple and gentle manner and on a large scale. The danger of decomposition is minimized owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process.