Physico-chemical Properties of Binary and Ternary Mixtures of Ethyl Acetate + Ethanol + 1-Butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide at 298.15 K and Atmospheric Pressure (original) (raw)
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Ionic liquids as solvents to separate the azeotropic mixture hexane/ethanol
Fluid Phase Equilibria, 2013
In this work the imidazolium ionic liquids 1-hexyl-3-methylimidazolium trifluoromethanesulfonate, [HMim][TfO], 1-hexyl-3-methylimidazolium dicyanamide, [HMim][N(CN) 2 ], 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [HMim][NTf 2 ], and 1-methyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide, [PMim][NTf 2 ], were studied as solvents for the separation of ethanol from its azeotropic mixture with hexane. The liquid-liquid equilibrium (LLE) of the ternary systems {hexane + ethanol + [HMim][TfO], or [HMim][N(CN) 2 ], or [HMim][NTf 2 ], or [PMim][NTf 2 ]} was carried out at 298.15 K and atmospheric pressure. From the experimental LLE data, the solute distribution ratio and selectivity were calculated and the solvent capacity of the studied ionic liquids was compared with another ionic liquid from literature. Finally, the experimental LLE data were correlated using the NRTL and UNIQUAC thermodynamic models.
The Journal of Chemical Thermodynamics, 2012
(Liquid + liquid) equilibrium data for the ionic liquids 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [EMim][NTf 2 ], 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [PMim] [NTf 2 ], 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [BMim][NTf 2 ], and 1-hexyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide, [HMim][NTf 2 ], mixed with ethanol and heptane were studied at T = 298.15 K and atmospheric pressure. The ability of these ionic liquids as solvents for the extraction of ethanol from heptane was evaluated in terms of selectivity and solute distribution ratio. Moreover, density and refractive index values over the miscible region for the ternary mixtures were also measured at T = 313.15 K. Finally, the experimental data were correlated with the Non Random Two Liquids (NRTL) and UNIversal QUAsi Chemical (UNIQUAC) thermodynamic models, and an exhaustive comparison with available literature data of the studied systems was carried out.
Introduction on Special Issue: Ionic Liquids
Journal of Solution Chemistry, 2015
One may ask what is the reason for this special issue of the Journal of Solution Chemistry being dedicated both to the fashionable topic of ionic liquids and to the memory of Prof. Eduard Hála. A prominent personality and internationally renowned thermodynamicist, Prof. Hála is the author of more than 50 original papers and, more importantly, of two seminal and timeless monographs [1, 2]. In the early 1960s, while he was still a young pedagogue at the Institute of Chemical Technology Prague, he wrote with his faculty colleague and longtime friend Arnost Reiser the first modern Czech textbook of physical chemistry that was inspired by similar university textbooks published in English. Later, he summarized his deep knowledge in a book entitled Vapor-Liquid Equilibria, which is commonly called ''a chemical engineer's cookbook''. Shortly after its publication in Czech, Vapor-Liquid Equilibria was translated into English and published by Pergamon Press. Since then this publication has become compulsory reading material of every thermodynamicist and engineer dealing with distillation processes. Prof. Hála was also among the first in Czechoslovakia to have grasped the importance of computer programming in science and later of the increasing significance of statistical thermodynamics. As an outstanding university educator and co-founder with Prof. Reiser of the so-called Prague School of Physical Chemistry, Prof. Hála is therefore worth remembering time and time again. Prof. Hála passed away in 1989 and even though ionic liquids were already a known class of compounds at that time, a pronounced interest in their properties and applications only started to show itself in the early 1990s. However, Prof. Hála was known throughout
The Journal of Chemical Thermodynamics, 2005
This article presents a first consequent thermodynamic optimization of ionic liquids (IL) as entrainers in the distillative separation of both an azeotropic aqueous (tetrahydrofuran + water) and a close-boiling aromatic test system (methylcyclohexane + toluene) on the basis of COSMO-RS predictions. The use of this method allows for the preselection from the large pool of available IL. Thus, favorable structural variations were identified and used for tailoring IL entrainers.
Journal of Chemical & Engineering Data, 2011
For the temperature range (80 to 120)°C, viscosity data are reported for imidazolium-based ionic liquids 1-octyl-3-methylimidazolium chloride [Omim][Cl], 1-hexyl-3-methylimidazolium chloride [Hmim][Cl], 1-butyl-3-methylimidazolium chloride [Bmim][Cl], 1-ethyl-3-methylimidazolium chloride [Emim][Cl], 1-ethyl-3-methylimidazolium acetate [Emim][Ac], 1-butyl-3-methylimidazolium acetate [Bmim][Ac], and 1-butyl-3-methylimidazolium dicyanamide [Bmim] [N(CN) 2 ]. Acetate-based ionic liquids have considerably lower viscosities than the corresponding chloride-based ILs. At 25°C, viscosity data are reported for binary mixtures of [Bmim][Ac] with diluents water, acetonitrile, dimethylformamide (DMF), and ethylene glycol. Even a small concentration of diluent very much reduces the viscosity of an ionic liquid.
Experiments with Ionic Liquids
Experiments in Green and Sustainable Chemistry, 2009
Over the last 20 years the field of ionic liquids (IL) chemistry has expanded enormously. Before this, the chemistry of simple liquid salts such as the alkali metal halides, with melting points of several hundred degrees, was well established and, of course, well utilized in the industrial preparation of iron, aluminum, and many reactive metals. The newer ionic liquids consist of organic cations, often quaternary nitrogen or ecluivalent atoms, and inorganic or simple organic anions. Examples of these cations are dialkylimidazolium, alkylpyri dinium and trialkylsulfonium. Anions include halides, carboxylates and halo. aluminates.
The a priori design and selection of ionic liquids as solvents for active pharmaceutical ingredients
Chemistry - A European Journal, 2017
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Application of Ionic Liquids in Separation and Fractionation Processes
2018
Aqueous biphasic systems Liquid-liquid systems formed by two water-soluble components dissolved in water, which above given concentrations form two phases. Biorefinery Facility with integrated processes to convert biomass into energy, fuels, materials, and commodity and value-added chemicals. Green chemistry Concept addressing the design of chemical products and processes aiming at reduce or eliminate the use and generation of hazardous substances. Ionic liquids Low melting temperature salts, composed of organic cations and organic/inorganic anions. Natural products Compounds that can be obtained from biomass. Solid-liquid extraction Process in which a solvent is added to solid biomass samples in order to extract target compounds. Definition of the Subject