Flow Pattern Optimization of a Sieve Plate Extraction Column Using Computational Fluid Dynamics Simulations and Particle Image Velocimetry Measurements

Flow pattern optimization of the continuous phase in a sieve plate extraction column (SPEC) was studied using computational fluid dynamics (CFD) simulations and particle image velocimetry (PIV) measurements. Simulations revealed a large reverse flow area between every two plates in the traditional SPEC. The flow pattern was optimized with the objective of minimizing reverse flow area since the reverse flow decreased mass transfer efficiency (MTE). Four new generations of SPECs with different internal structures were proposed. Structure modifications included slotting and inclining the downcomers, adding baffles, adjusting the number of slots, and fixing small, leveled baffles at some slots. An optimal flow pattern almost without reverse flow area evolved. PIV measurements were carried out on three differently structured SPECs, and the results of simulations and measurements were in good agreement. Meanwhile, simulations showed that MTE improved as the flow pattern was optimized.