2003
DOI: 10.1021/jp034576x
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Pressure, Isotope, and Water Co-solvent Effects in Liquid−Liquid Equilibria of (Ionic Liquid + Alcohol) Systems

Abstract: Liquid-liquid phase splitting in ternary mixtures that contain a room-temperature ionic liquid and an alcohol aqueous solutionsnamely, [bmim] [PF 6 ] + ethanol + water and [bmim][NTf 2 ] + 2-methylpropanol + waters is studied. Experimental cloud-point temperatures were obtained up to pressures of 400 bar, using a He-Ne laser light-scattering technique. Although pressurization favors mutual miscibility in the presence of high concentrations of alcohols, the contrary occurs in water-rich solutions. Both ternary… Show more

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Cited by 157 publications
(167 citation statements)
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“…2 4 ], the ternary diagrams show wide areas of total miscibility, although the corresponding binary mixtures (IL + dichloromethane and IL + 2-propanol) exhibit liquid-liquid immiscibility. This surprising co-solvent effect is phenomenologically similar to that observed in ternary mixtures of (alkyl-imidazolium based ionic liquid + alcohols + water) [24][25][26][27]. Taking into account the difference in nature of the components in these ternary mixtures (alkyl-imidazolium based ionic liquid + alcohols + water versus hydroxyalkyl-imidazolium based ionic liquid + alcohol + dichloromethane), this co-solvent effect is quite unexpected.…”
Section: Apparatus and Proceduressupporting
confidence: 69%
“…2 4 ], the ternary diagrams show wide areas of total miscibility, although the corresponding binary mixtures (IL + dichloromethane and IL + 2-propanol) exhibit liquid-liquid immiscibility. This surprising co-solvent effect is phenomenologically similar to that observed in ternary mixtures of (alkyl-imidazolium based ionic liquid + alcohols + water) [24][25][26][27]. Taking into account the difference in nature of the components in these ternary mixtures (alkyl-imidazolium based ionic liquid + alcohols + water versus hydroxyalkyl-imidazolium based ionic liquid + alcohol + dichloromethane), this co-solvent effect is quite unexpected.…”
Section: Apparatus and Proceduressupporting
confidence: 69%
“…Comparatively, phenylboronic acid is insoluble in some imidazolium ionic liquids and will therefore predominantly remain behind in the reactant ethanol:water solvent phase [70]. The absence of transportation for the water and ethanol reaction mixture constituents through the catalyst membrane is most probably due to the immiscibility of ethanol and water with imidazole containing ionic liquids and the pulsed plasma deposited poly(vinylbenzyl chloride) interfacial layer at ambient temperature [71][72][73], as well as liquid repellency from the underlying PTFE membrane (surface tension of water = 72.8 mN m −1 [74], surface tension of ethanol = 22.3 mN m −1 [74], and surface energy of PTFE = 20.0 mN m −1 [75]). Therefore, the outlined approach not only allows for the palladium catalysed Suzuki-Miyaura carbon-carbon coupling reaction to proceed at room temperature under flow conditions, but also concurrently separates the solvent mixture from the aromatic product phase, thereby eliminating any need for post reaction separation of product from reaction solvents.…”
Section: Discussionmentioning
confidence: 99%
“…[7] In particular the addition of water can strongly affect the physical and chemical properties of ionic liquids such as viscosity, [8,9] electrical conductivity, [10] and reactivity, [11] as well as solvation and solubility properties. [12][13][14][15][16] Water is also an impurity commonly present in ILs since all known ILs are hygroscopic; traces of water are thought to be ubiquitous in these materials.…”
mentioning
confidence: 99%