Phase diagrams of ionic liquids-based aqueous biphasic systems as a platform for extraction processes
authors Sintra, TE; Cruz, R; Ventura, SPM; Coutinho, JAP
nationality International
journal JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords Aqueous biphasic systems; Ionic liquid; Anion; Cation; pH; Potassium salts; Ionic strength
keywords 298.15 K EXPERIMENT; 2-PHASE SYSTEMS; SALTING-OUT; 1-BUTYL-3-METHYLIMIDAZOLIUM BROMIDE; TETRABUTYLAMMONIUM BROMIDE; SELF-AGGREGATION; CONTROLLED PH; WATER; SEPARATION; TETRAFLUOROBORATE
abstract In the past few years, ionic liquid-based aqueous biphasic systems have become the subject of considerable interest as a promising technique for the extraction and purification of several macro/biomolecules. Aiming at developing guidelines for more benign and efficient extraction processes, phase diagrams for aqueous biphasic systems composed of ionic liquids and inorganic/organic salts are here reported. Several combinations of ionic liquid families (imidazolium, pyridinium, phosphonium, quaternary ammonium and cholinium) and salts [ potassium phosphate buffer (KH2PO4/K2HPO4 at pH 7), potassium citrate buffer (C6H5K3O7/C6H8O7 at pH 5, 6, 7 and 8) and potassium carbonate (K2CO3 at pH similar to 13)] were evaluated to highlight the influence of the ionic liquid structure (cation core, anion and alkyl chain length), the pH and the salt nature on the formation of aqueous biphasic systems. The binodal curves and respective tie-lines reported for these systems were experimentally determined at (298 +/- 1) K. In general, the ability to promote the aqueous biphasic systems formation increases with the pH and alkyl chain length. While the influence of the cation core and anion nature of the ionic liquids on their ability to form aqueous biphasic systems closely correlates with ionic liquids capacity to be hydrated by water, the effect of the different salts depends of the ionic liquid nature and salt valency. (C) 2013 Elsevier Ltd. All rights reserved.
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn 0021-9614
year published 2014
volume 77
beginning page 206
ending page 213
digital object identifier (doi) 10.1016/j.jct.2013.10.024
web of science category Thermodynamics; Chemistry, Physical
subject category Thermodynamics; Chemistry
unique article identifier WOS:000339813500030
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journal impact factor 2.888
5 year journal impact factor 2.5
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