Optimization of Three-Phase Extraction Processes in a Cascade of Mixing and Settling Apparatuses

A theoretical analysis was performed of various options for organizing coupled extraction-re-extraction processes in a cascade of mixing-settling extractors: schemes in which the extractant phase passes through all stages of extraction, then through all stages of re-extraction, and schemes of the processes when the flow of this phase circulates between the stages of extraction and re-extraction in separate groups of cascade extractors (schemes of supported free liquid membranes). It has been established that supported free liquid membrane schemes provide a higher degree of extraction and better separation quality.