Method for producing highly pure aqueous hydroxylamine solutions

US6153799A · kind A · utility

Assignee

• BASF SE

Inventors

• Otto Watzenberger · Ludwigshafen, DE
• Heiner Schelling · Ludwigshafen, DE
• Peter Pfab · Schwarzheide, DE
• Eckhard Ströfer · Mannheim, DE

Key dates

• Filing date: Dec 8, 1999
• Grant date: Nov 28, 2000
• Expiry date: Dec 8, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B21/1463
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A very pure aqueous solution of free hydroxylamine is prepared by a process in which the dilute, aqueous hydroxylamine solution is concentrated in a column by removing hydroxylamine-containing vapors via a side take-off in the bottom of the column, and very pure hydroxylamine is obtained by condensing the vapors. The novel process can be carried out simply, in a gentle manner and on a large scale and gives electronic grade hydroxylamine.