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.
Under the presupposition of plug flow with dispersion, the partial differential equation (s.eq.3) for two-dimension (radial and axial) dispersion in a pulsed extraction column is deduced. Under the condition of pulse input of tracer at the center of the column, the mathematical solution for eq.3 is found and given in this paper, that is,the mathematical model for two-dimension dispersion (s.eq.4). This mathematical model corresponds to the measured experimental data (s. Fig.3). With the Marquardt method for minimization of sum of square of errors between model and experimental data, the radial dispersion coefficient and axial dispersion coefficient could be determined at the same time.
