Phase behaviour of trihexyl(tetradecyl)phosphonium chloride, nonane and water

Abstract

This research details our investigations into the potential for separating the ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P 6 6 6 14 ]Cl) from nonane using water. A miscible two component mixture of [P 6 6 6 14 ]Cl and straight chain hydrocarbon separates upon addition of water into a three-phase mixture. The phase behaviour for [P 6 6 6 14 ]Cl/water/nonane is presented, showing a stable three-component phase, whereby any additional water or nonane separates into its own immiscible layer. Although this limits the potential use of this system for entirely separating hydrocarbons from this ionic liquid, it has potential for other uses, such as triphasic catalysis.

Miscibility of tetrafluoroborate ionic liquids with dihydroxy alcohols

“…The conventional evaporation and distillation techniques for the separation of diols from the complex and aqueous solution require high-energy consumption due to their high boiling points and strong hydrophilic properties. At present, most of the miscibility data available are focused on liquid-liquid equilibria of ionic liquids with hydrocarbons [13,14] or monohydroxy alcohol systems [15][16][17][18][19]. Recently published study on miscibility of RTILs with polyhydric alcohols yielded very interesting observations [20][21][22][23][24][25].…”

Ionic Liquid–Liquid Chromatography: A New General Purpose Separation Methodology

“…Most hydrophobic ionic liquids are very poorly soluble in water phases, but water has appreciable solubility in the ionic liquid phase. Thus, if the mobile phase in CCC is water, then product isolation is simply a matter of evaporating the water phase [ 40 , 124 , 125 , 129 , 141 – 144 ].…”

“…The ionic phase was found to contain the majority of the ethyl ethanoate, and forms the upper liquid layer. The aqueous phase of water (92.4–92.8 wt%) and ethyl ethanoate (7.2–7.6 wt%) was analysed by 1 H NMR and found not to contain the ionic liquid [P 6 6 6 14 ]Cl (the concentration of [P 6 6 6 14 ]Cl in the mobile water phase was not detectable and estimated to be < 0.5 mol% concentration by this technique) [ 144 ].…”

Ionic Liquid–Liquid Chromatography: A New General Purpose Separation Methodology

“…Most hydrophobic ionic liquids are very poorly soluble in water phases, but water has appreciable solubility in the ionic liquid phase. Thus, if the mobile phase in CCC is water, then product isolation is simply a matter of evaporating the water phase [40,124,125,129,[141][142][143][144].…”

“…The ionic phase was found to contain the majority of the ethyl ethanoate, and forms the upper liquid layer. The aqueous phase of water (92.4-92.8 wt%) and ethyl ethanoate (7.2-7.6 wt%) was analysed by 1 H NMR and found not to contain the ionic liquid [P 6 6 6 14 ]Cl (the concentration of [P 6 6 6 14 ]Cl in the mobile water phase was not detectable and estimated to be \ 0.5 mol% concentration by this technique) [144]. The separation of the copper(II), nickel(II) and cobalt(II) aqueous complexes dissolved in water was analysed by means of a UV-Vis detector situated before the fraction collector.…”