Process for hydroformylation with rhodium catalysts and the separation of rhodium therefrom

US4731485A · kind A · utility

Assignee

• Ruhrchemie Aktiengesellschaft · DE

Inventors

• Boy Cornils · Dinslaken, DE
• Werner Konkol · Oberhausen, DE
• Helmut Bahrmann · Hamminkeln, DE
• Hanswilhelm Bach · Oberhausen, DE
• Ernest Wiebus · Oberhausen, DE
• Wolfgang Lipps · Isny im Allgäu, DE

Key dates

• Filing date: Feb 2, 1987
• Grant date: Mar 15, 1988
• Expiry date: Feb 2, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/50
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for separating rhodium from mixtures thereof, comprising extracting said rhodium with an aqueous solution of a rhodium complexing agent and a solubilizer. A process for preparing aldehydes in the presence of both the complexing agent and the solubilizer is also set forth. The solubilizer is generally selected from salts of carboxylic acids having 8-20 carbon atoms, alkyl sulfonates, alkyl aryl sulfonates, amines and quaternary ammonium compounds of Formula II ##STR1## wherein A is alkyl, alkoxy, hydroxyalkyl, aryl having 6-25 carbon atoms, or R.sup.7 CONHCH.sub.2 CH.sub.2 CH.sub.2 --wherein R.sup.7 is alkyl having 5-11 carbon atoms; B is an alkyl having 1-25 carbon atoms, an aryl having 6-25 carbon atoms, or an .omega.-hydroxy alkyl having 1-4 carbon atoms; C and D are each independently an alkyl or .omega.-hydroxy alkyl having 1-4 carbon atoms or form, together with each other and the bridging N, a 5 or 6 membered heterocyclic ring; E is a halide, sulfate, borate, sulfonate, lactate or citrate; and p is the number of charges on E. The rhodium complexing agent is preferably a triaryl phosphine carboxylate or sulfonate.