首页|Intensified liquid-liquid extraction of biomolecules using ionic liquids in small channels
Intensified liquid-liquid extraction of biomolecules using ionic liquids in small channels
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NSTL
The continuous extraction of an amino acid from an aqueous solution into an ionic liquid phase was studied experimentally in small channels, demonstrating a double intensification of the solvent used and the overall process. Channels with 0.5, 1 and 2 mm internal diameter were used for the extraction of the amino acid, L-tryptophan from an aqueous solution (0.005 mol L~(-1)), into a hydrophobic ionic liquid, 1-Butyl-3-methylimida-zolium Bis (trifluoromethanesulfonyl)imide, [C4mim] [Tf2N] in the presence of a crown ether extractant , Dicyclohexano-18-crown-6, (DC18C6). A mechanism was proposed for the extraction which involved the ammonium centre of the amino acid forming hydrogen bonds with the 18~crown-6 part of the extractant at a 1:1 ratio. Partition coefficients up to 25 were obtained. The continuous extraction experiments were carried out during plug flow where the interfacial areas reported reached up to 5500 m~2m~(-3) at 50% volume fractions. Extraction efficiencies up to 90% were obtained for residence times less than 30 s. Overall mass transfer coefficients (K_La) found reached up to 0.14 s~(-1).
NSTL
