Comparison of the performance of a pulsed disc and doughnut column with a pulsed sieve plate liquid extraction column

Abstract

The hydrodynamic and mass-transfer performance of a 75 mm diameter pulsed disc and doughnut column (PDD) and a pulsed sieve-plate column (PSP) are presented and compared for a toluene-acetone-water system under similar operating conditions. It was found that the pulsed disc and doughnut column flooded earlier than the pulsed sieve-plate column, indicating that the total throughput per unit cross-sectional area through the pulsed disc and doughnut column was less. At similar operating conditions (i.e., flowrates, pulse frequency, and amplitude), the mass-transfer performance of the pulsed disc and doughnut column was higher, and its holdup higher. The mass-transfer performance of the PSP colu..