Process Intensification of Aqueous Biphasic Hydroformylation of Mid Chain Olefin 1-Octene in a Jet Loop Reactor Creating Large Interfacial Areas

摘要

The hydroformylation is an atom-economic, homogenously catalyzed reaction where an alkene is converted under syngas pressure to form linear and branched aldehydes following figure 1. Most commonly the reaction is catalyzed by rhodium complexes modified with steric phosphine ligands to increase reactivity and selectivity. Due to the high market price and even higher price volatility of rhodium, an efficient catalyst recycle is eminent for an economic process. A possible solution is to immobilize the rhodium in an aqueous second phase by the use of the ligand triphenylphosphine trisulfonate (TPPTS). Substrates diffuse into the aqueous catalyst phase and react at the catalyst complex. Products can subsequently be separated by a simple decantation step in an organic phase. This recycle concept works exceptional for short-chain substrates but has its limitations for alkenes with C because the substrate solubility in the catalyst phase decreases significantly with increasing chain length. While the majority of studies working on this limitation heavily focus on the use of chemical additives like surfactants, co-solvents or phase transfer promoters to increase solubility or interfacial surface only seldom procedural approaches were investigated. This work therefore focuses on an additive-free procedural approach to enhance the reaction rates of the hydroformylation of mid-chain olefin 1-octene in a phase contacting jet loop reactor.