Abstract: A new type of modified extraction equipment——CTRDC(rotating disk contactor with closed turbine)has been developed.The experimental results of hydrodynamics and mass transfer in CTRDC show that the rotor speed required for satisfactory dispersion could decrease sharply with more uniform axial d p distribution.Compared with RDC,CTRDC offers better performance,such as throughput and efficiency.The experimental results can serve as a reference for scale up design and operation optimization.