Physico-chemical properties and phase behavior of the ionic liquid-β-cyclodextrin complexes.
The solubility of β-cyclodextrin (β-CD) in ionic liquids (ILs) and the activity coefficients at infinite dilution (γ13(∞)) of more than 20 solutes (alkanes, aromatic hydrocarbons, alcohols) were measured in four chosen ionic liquids, their mixtures with β-CD, and in the β-CD at high temperatures from 338 to 398 K using the inverse gas chromatography. The intermolecular interactions, inclusion complexes and the possible increasing of the solubility of β-CD in water using the IL are presented. The solubility of β-CD in ten chosen hydrophobic ILs at the temperature T = 423 K was detected. The solid-liquid phase diagrams (SLE) of {IL (1) + β-CD (2)} binary systems at the high mole fraction of the IL were measured for three systems (1-ethyl-3-methylimidazolium chloride, [EMIM][Cl], 1-ethyl-3-methylimidazolium bromide, [EMIM][Br]; and for 1-butyl-3-methylimidazolium chloride, [BMIM][Cl]). The eutectic points were determined at the high IL concentration for all binary systems. The intermolecular interaction and the possibility of inclusion complexes of the IL and/or solvents with β-CD were discussed. The infrared spectroscopy, IR was used for the description of the intermolecular interactions in the (β-CD + IL) systems. It was shown via the activity coefficients at infinite dilution results that the inclusion complexes are dependent on the temperature. The addition of β-CD to the IL does not improve the selectivity of the separation of the aliphatics from aromatics.
LCP-A2MC, EA 4164, Université de Lorraine, Metz, France. rogalski@univ-metz.fr
Marek
M
Rogalski
Ali
A
Modaressi
Pierre
P
Magri
Fabrice
F
Mutelet
Aleksandra
A
Grydziuszko
Michał
M
Wlazło
Urszula
U
Domańska
D057927:Hydrophobic and Hydrophilic Interactions; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D012995:Solubility; D047392:beta-Cyclodextrins / Q000737:chemistry*
C575771:1-ethyl-3-methylimidazolium bromide; D007093:Imidazoles; D052578:Ionic Liquids; D047392:beta-Cyclodextrins; C502841:1-butyl-3-methylimidazolium chloride; C031215:betadex