Axial Dispersion Study in Fixed Bed Columns

摘要

Axial mixing in a fixed bed column, with porous cylindrical particles, has been studied. The experiments were conducted at atmospheric pressure, two different temperature values (30 degrees C, 50 degrees C) and several liquid (water) phase flowrates (7.65, 12.6, 17.5, 22.2 L/h). Granular cylindrical particles of charcoal as the solid phase and distilled water, as the liquid phase, have been used. The pulse response technique with a sodium chloride solution has been utilized. The distribution function of the residence times (E(theta)), the Bodenstein number (Bo) and the axial dispersion coefficient (D-L) have been experimentally established. The obtained experimental data reveal the temperature and the liquid phase velocity (Reynolds number) effects on the Bodenstein number and the axial dispersion coefficient. Based on the mixing cell model, the cell number and the E(theta) function have been calculated, the last one being compared to the experimental distribution function E(theta).