Liquid Membrane Separation
Liquid membrane separation combines the solvent extraction and stripping processes (re-extraction) in a single step.
This entry has the objective of introducing the reader to the basic definitions of the liquid membrane field, with classification.
The term liquid membrane transport includes processes incorporating liquid-liquid extraction (LLX) and membrane separation in one continuously operating device. It utilizes an extracting reagent solution, immiscible with water, stagnant or flowing between two aqueous solutions (or gases), the source or feed, and receiving or strip phases. In most cases, the source and receiving phases are aqueous, and the membrane is organic, but the reverse configuration can also be used. A polymeric or inorganic microporous support (membrane) may be used as bearer (as in SLM) or barrier (as in BLM technologies) or not used, as in ELM and layered BLM (see respective entries: SLM, Emulsion Liquid Membrane (ELM), Silver Recovery by Bulk Liquid Membrane (BLM))....