Experimentally determined mass transfer rates of the gas-liquid multiphase flow in a jet zone loop reactor are compared to several existing model approaches. The experimental data deviate due to insufficient consideration of the local hydrodynamic effects in the models. It is identified that bubble surface movement and its impact on the turbulence are not yet appropriately pictured. A new approach for describing the mass transfer coefficient in the riser of the jet zone loop reactor is derived, including the effect of mass transfer enhancement by bubble-induced turbulence.