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Ruthenium running its rounds – recycling of a homogeneous ruthenium catalyst for hydroformylation of linear aliphatic alkenes by ex situ product extraction and successful application in a continuously operated miniplant for 90 h.

Verzweigte Oleochemikalien unterscheiden sich in ihren physikochemischen Eigenschaften deutlich von Ihren geradkettigen Homologen, woraus sich ein gesteigertes industrielles Interesse an dieser Stoffklasse ergibt. Innerhalb der vorliegenden Untersuchungen wurde ein homogenkatalysiertes Verfahren zur Herstellung verzweigter Oleochemikalien mittels Tandemreaktion linolhaltiger Fettsäurederivate und Ethen weiterentwickelt. In den Miniplant‐Versuchen konnte der Katalysator mithilfe eines temperaturgesteuerten Mehrkomponenten‐Lösungsmittelsystems über eine Versuchsdauer von 100 h erfolgreich recycelt werden.

This paper describes the development of an efficient catalyst recycling concept for the iridium-catalysed hydroformylation of 1-octene through the investigation of biphasic systems, thermomorphic solvent systems and an ex situ extraction. Particularly high selectivities (>90%) towards the desired aldehydes as well as low rates of iridium leaching were observed using the monosulfonated triphenylphosphine ligand (TPPMS). In polar solvents such as propylene carbonate or N,N-dimethylformamide, low rates of catalyst leaching (0.2%) as well as high rates of product separation (nearly 80%) were achieved. High reaction rates and a long-term activity and stability of the catalyst were observed using the solvent N,N-dimethylformamide and the extraction with non-polar solvents.Catal. Sci. Technol. This journal is