Preparation of hydroxylammonium salts

US4889704A · kind A · utility

Assignee

• BASF SE

Inventors

• Hugo Fuchs · Ludwigshafen, DE
• Josef Ritz · Ludwigshafen, DE
• Erwin Thomas · Freinsheim, DE
• Franz-Josef Weiss · Schifferstadt, DE

Key dates

• Filing date: Apr 20, 1988
• Grant date: Dec 26, 1989
• Expiry date: Apr 20, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B21/1418
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Hydroxylammonium salts are prepared by catalytic reduction of nitrogen monoxide with hydrogen at elevated temperature in a dilute aqueous solution of a mineral acid in the presence, in suspension, of a supported platinum catalyst obtainable by precipitating metallic platinum from an aqueous platinum solution onto a support by means of a reducing agent in the presence of an organic chelating agent and partially poisoned with sulfur.