Kinetic study and modeling of the Rh-catalyzed hydrosilylation of acetophenone in a batch reactor and in a microreactor
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The Rh-catalyzed hydrosilylation of acetophenone in the presence of [Rh(CO)2(μ-Cl)]2 and [Rh(COD)Cl]2 complexes, as well as with an in situ addition of nitrogen-containing derivatives of mono- and bicyclic terpenes was investigated in a flow microreactor and in a batch reactor. Kinetic modeling, reaction equilibrium analysis and multi-criteria optimization of the process were applied to compare the performances of the reactors. In general, the highest catalytic activity was reached in the presence of [Rh(COD)Cl]2 and [Rh(CO)2(μ-Cl)]2 without the addition of amines. The best reaction selectivity towards 1-phenylethanol silyl ether with the [Rh(CO)2(μ-Cl)]2 complex was observed in the microreactor. The addition of (R)-(−)-cis-MyrtNH2 and (R)-(+)-BornylNH2 amines, as well as an increase of the amine-to-rhodium molar ratio significantly decreased the conversion and selectivity in both reactors. In this connection, the [Rh(COD)Cl]2 complex demonstrated a better catalytic performance in all cases. The application of the flow microreactor promoted another elementary reaction pathway due to micromixing effects.
KeywordsHydrosilylation Rhodium catalyst Micromixing Microreactor Kinetic modeling Multi-criteria optimization
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