Liquid–Liquid Extraction Performance of Multi-Stage Loop Extraction Column

Abstract

In this paper, a novel multi-stage loop extraction column (MSLEC) is proposed based on the principles of a jet loop contactor and droplet-film alternate flow. The experiments under different U_c and U_d were carried out to investigate the flow structure, hydrodynamic performance and mass transfer efficiency of the MSLEC in liquid–liquid extraction. The results showed that the flow structure in the MSLEC formed the alternating droplet-film flow of the dispersed phase. Meanwhile, the plug-flow for the dispersed phase and the circulation-flow for the continuous phase achieved parallel flow. The hydrodynamics and mass transfer efficiency of extraction tower using Super Mini Rings (SMREC) were measured under the same conditions as a control. The hydrodynamic performance in the MSLEC was enhanced by 52% and the mass transfer efficiency was enhanced by 24% on average.