Preparation of hydroxylammonium salts

US4895711A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Biffar · Bischofswerda, DE
• Werner Steigleiter · Schifferstadt, DE
• Franz-Josef Weiss · Schifferstadt, DE

Key dates

• Filing date: Mar 22, 1989
• Grant date: Jan 23, 1990
• Expiry date: Mar 22, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Hydroxylammonium salts are prepared by catalytic reduction of nitrogen monoxide with hydrogen in dilute aqueous mineral acids at elevated temperature in the presence of suspended supported platinum catalysts obtainable by precipitating metallic platinum from aqueous solutions of platinum salts onto carriers suspended therein by means of reducing agents in the presence of one or more water-soluble substituted or unsubstituted thioureas.