Stabilizing rhodium catalysts for the hydroformylation of olefins

US6500991B2 · kind B2 · utility

Assignee

• OXENO OLEFINCHEMIE GMBH · DE

Inventors

• Klaus-Diether Wiese · Haltern am See, DE
• Martin Trocha · Essen, DE
• Dirk Roettger · Recklinghausen, DE
• Walter Toetsch · Marl, DE
• Alfred Kaizik · Marl, DE
• Wilfried Buschken · Haltern am See, DE

Key dates

• Filing date: Sep 25, 2001
• Grant date: Dec 31, 2002
• Expiry date: Sep 25, 2021

Classification

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

Abstract

Aldehydes are prepared by a process, which comprises:hydroformylating olefins having 3 to 21 carbon atoms under an atmosphere of CO/H2 in the presence of a rhodium catalyst in a hydroformylation reactor; andupon discharging the reaction product from the reactor,a) separating the discharged material into a gaseous phase and a liquid phase,b) separating the liquid phase into a top fraction containing unconverted olefins and aldehydes and a bottoms fraction containing the rhodium catalyst, andc) cooling the bottoms fraction below the temperature of the material discharged from the hydroformylation reactor and feeding a gas containing carbon monoxide into the bottoms fraction.