Method for producing an aqueous hydroxylamine solution devoid of salt

US7105078B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Karl-Heinz Wostbrock · Bad Kötzting, DE
• Eckhard Ströfer · Mannheim, DE
• Markus Weber · Langenfeld, DE
• Steffen Kerth · Ludwigshafen, DE

Key dates

• Filing date: Jul 2, 2002
• Grant date: Sep 12, 2006
• Expiry date: Jan 15, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na+:K+ in the range from 70:30 to 95:5 and with a total concentration of Na+ and K+ in the range from 0.1 to 10 m/m % based on the total amount of the mixture.