Ionic Liquid Based Aqueous Biphasic Systems with Controlled pH: The Ionic Liquid Cation Effect
authors Ventura, SPM; Sousa, SG; Serafim, LS; Lima, AS; Freire, MG; Coutinho, JAP
nationality International
journal JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords PHASE-DIAGRAM DATA; 2-PHASE SYSTEMS; SALTING-OUT; 298.15 K; 1-BUTYL-3-METHYLIMIDAZOLIUM TETRAFLUOROBORATE; MUTUAL SOLUBILITIES; PENICILLIN-G; AMINO-ACIDS; PLUS SODIUM; EXTRACTION
abstract This work addresses the evaluation of the ability of ionic liquid cations on the formation of aqueous biphasic systems (ABS's), with K(2)HPO(4) or a mixture of inorganic salts, K(2)HPO(4)/KH(2)PO(4), aiming at controlling the pH values of the coexisting aqueous phases. Using chloride-based ionic liquids, the effects of the cation core, the length of the alkyl side chain, and the positional isomerism on ABS formation ability were investigated. All binodal curves were determined by the cloud-point titration method at 298 K. From the obtained phase diagrams it is shown that the biphasic area increases with the cation side chain length, from ethyl to hexyl chains, although for longer chains, an inversion on the binodal curves sequence appears due to the self-aggregation of the longer chain ionic liquids in aqueous solutions. The influence of the cation core and the positional isomerism of the ionic liquids on their ability to form ABS closely correlates with the ionic fluid affinity for water.
publisher AMER CHEMICAL SOC
issn 0021-9568
year published 2011
volume 56
issue 11
beginning page 4253
ending page 4260
digital object identifier (doi) 10.1021/je200714h
web of science category Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000296685600042
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journal impact factor 2.196
5 year journal impact factor 2.331
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