Separation process: Solvent extraction and liquid membrane process

 

Assoc. Prof. Dr. Norasikin Othman

A liquid membrane is formed by a thin layer of the organic phase (usually with dissolved reagents) between two aqueous phases of different compositions. This thin layer of organic phase can be immobilized onto suitable inert microporous support, which when interposed in between two aqueous solutions is termed supported liquid membrane (SLM). In this three-phase extraction technique and analytes are extracted from a continuously flowing aqueous sample through an organic liquid phase into another usually temporally stagnant, aqueous phase. Liquid membrane (LM) is a relatively new and prospective separation system consisting of a liquid film through which selective mass transfers of gases, ions, or molecules occur via permeation and transport processes. Owing to its advantages over the solid membranes and solvent extraction, LM has become the subject of intensive studies all over the world.

 

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