Determination of axial dispersion coefficients in mechanically agitated extraction columns under non-flow situations

Abstract

Axial dispersion coefficients were measured by electrolytic tracer analysis on the continuous phase of pulsed disk and ring liquid extraction column sections of about 50 cm in length. The experiments were set up so that the continuous phase would not flow through the apparatus, and the solid present would be suspended in solution. The parameters varied were the pulsation velocity Af (from 0.42 to 2.91 cm / s), the column cross sectional area Al (from 15.9 to 78.54 cm²), and the spacing between disk and ring h (from 2.5 to 6.25 cm). In order to measure the axial dispersion coefficients Dl a theoretical model was developed. Finally, the generalized relationship D1 36.37 (Af) 0.625 (Al)-0.611 (h)0.082 was obtained.