Emulsion Liquid Membrane Extraction

Extraction using emulsions, often termed as emulsion liquid membrane (ELM) was first perceived by Li (1968). Since then, ELM processes have been developed for a diverse variety of applications. Oil-in-water (OAV) emulsions are used for extraction of solutes from non-aqueous solutions while water-in-oil (W/O) emulsions are used for the extraction of solutes from aqueous solutions. The potential of ELM as an effective separation technique in the area of biotechnology has not been fully explored. The promising applications are encapsulation of enzymes and separation of products from fermentation broth.

7.1. Extraction system

A typical scheme for ELM is shown in Figure 8. An emulsion liquid membrane is formed by creating a dispersion of the stripping phase within an organic solvent which forms nonporous film around the stripping phase droplets. The emulsion is stabilized by surfactants of proper HLB values. The organic solvent may be a kerosene-xylene

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