Novel rhodium recovery

US5091546A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Peter Lappe · Dinslaken, DE
• Helmut Springer · Dinslaken, DE

Key dates

• Filing date: Sep 26, 1990
• Grant date: Feb 25, 1992
• Expiry date: Sep 26, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the recovery of rhodium from distillation residues of crude products from the oxo synthesis with rhodium complexed with an organic phosphorous III compound comprising treating the said distillation residues with oxygen or an oxygen containing gas in the presence of an alkali metal salt of a monocarboxylic acid of 2 to 5 carbon atoms at 60.degree. to 120.degree. C. at atmospheric or elevated pressure to form a water-soluble rhodium compound and extracting the mixture with water to obtain an aqueous phase containing the water soluble rhodium compound in a very simple manner without any substantial loss of rhodium.