Chapter 7 Liquid membranes (liquid pertraction)

Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

“…[1] Usually, liquid membranes are applied in the form of bulk liquid membranes (BLM), supported liquid membranes (SLM) or emulsion (surfactant) liquid membranes (ELM) of which the preparation and properties are widely described in literature. [2] Relatively new liquid membrane systems (pertractors) are the multimembrane hybrid system (MHS) constructed from two physically different membranes (e. g. polymeric or liquid, reactive or neutral). The MHS idea and operation [3 -5] are reported in the papers from our previous investigation of biomimetic membrane systems [6,7] or alternatively, by other authors [8,9] on the nondispersive extraction processes.…”

Liquid membrane extraction of bio-active amphiphilic substances: Recovery of surfactin

“…In fact, pertraction process is a combination of extraction and stripping operations performed simultaneously in one stage [24]. The main advantages of pertraction towards conventional liquid-liquid extraction are the use of smaller quantities of organic solvent due to continuous regeneration of the organic solvent, as well as the possibility to recover the target species even in cases of low distribution coefficients [25]. The use of liquid membranes presents an attractive approach to produce valuable products of high quality at reduced costs, giving the opportunity to use as liquid membranes less powerful but more selective, less toxic and less expensive solvents than in the case of classical solvent extraction.…”

Mathematical model for swelling in a liquid emulsion membrane system

“…Boyadzhiev and Lazarova [5] have brought out the advantages of LEM over the conventional solvent extraction process in low solvent inventory, low equipment cost and higher mass transfer rate due to a larger available surface area for extraction. Bart et al [6] have a cost comparison of extraction, permeation and precipitation.…”