NEW STRATEGIES IN SEPARATION OF CLOSE BOILING(SOLID)MIXTURES : EXTRACTION INTO MICELLAR AND MICROEMULSION MEDIA

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Abstract
Aqueous solutions of various surfactants, such as, sodium lauryl sulphate, lauryl alcohol-7-ethoxylate, cetyl pyridinium chloride, cetyl trimethylammonium bromide, etc., at concentrations above their critical micelle concentration values, known as micellar solutions, and microemulsion solutions consisting of these surfactants and a co-surfactant, n-butanol, have been used successfully to separate mixtures of isomeric/non-isomeric close boiling substances like o-nitrochlorobenzene/ p-nitrochlorobenzene, o-nitrotochlorbenzene, p-nitrotoluene, 2,6-xylenol/ p-cresol, -2,4-dichloro-phenol/2,4,6-trichlorophenol, o-isopropylphenol/ p-isopropylphenol, from their solid mixtures. Exceptionally high values for the separation factor have been realized and these novel methods appear to be promising for industrial utilization.