Solid-Liquid Mass Transfer in Gas-Liquid-Solid Agitated Vessel

抄録

The solid-liquid mass transfer coefficients k_L in gas-liquid-solid agitated vessels with new type impellers were measured to be compared with those in vessels with conventional impellers (e.g. propeller, paddle, Rushton turbine). k_L for the new type impellers are larger than those for the conventional type impellers at a low impeller rotational speed and have the same value at the same total power consumption per unit volume. For the conventional impellers the rotational speed for the complete suspension N_JS changes with the impeller height and the gas flow rate. In the case of the new type impellers for which the aeration assists the suspension of the particles, k_L is correlated well with the sum of the power consumption per unit volume under aeration and the aeration power per unit volume. However, in the case of the Rushton turbine the aeration dose not affect the suspension, then k_L under aeration is correlated just with the power consumption per unit volume. k_Ls for the conventional impellers are affected with the impeller position for the complete suspension.