Dynamic characteristics in a pulsed extraction column

Abstract

This investigation was carried out to study the dynamic properties of pulse-dsieve plate extraction column by determining the axial dispersion coefficients of the continuous phase and dispersed phase holdup. In order to do this, a plate column which is consists of main body (pyrex glass; I.D = 46 mm) and stainless sampling port (5 points), and two phase disengaging section (top; I.D = 85 mm, L = 350 mm, bottom; I.D = 46 mm, L = 200 mm), effective height is 224 cm, plate spacing is unequal (25 mm/25 mm/150 mm/25 mm---) and its plate free area is 23% was installed. The Peclet numbers of aqueous phase in $H_2$O-n-Dodane system were determined by the moment matching method from the residence time distribution curves using one point measuring technique. The correlation of axial dispersion coefficient of a continuous phase for single phase, two phase and dispersed phase holdup, was expressed as follow, $E_c = 8.49\cdot A^{0.112}\cdot f^{-0.115}\cdot U_c^{0.879}$ $E_c = 14.4\cdot A^{0.02}\cdot f^{0.13}\cdot U_c^{0.53}\cdot U_d^{0.04}$ $\phi_d = 5.80\times10^{-2}\cdot A^{-0.87}\cdot f^{-0.47}\cdot U_c^{-0.49}\cdot U_d^{0.04}$ (A·f<1.5cm/sec) $\phi_d =7.52\times10^{-2}\cdot (A\cdot f^2)^{0.20}\cdot U_c^{0.08}\cdot U_d^{0.38}$ (A·f>1.5cm/sec)