Properties modification by eutectic formation in mixtures of ionic liquids

Stolarska, Olga; Soto, Ana; Rodríguez, Héctor; Śmiglak, Marcin

doi:10.1039/c4ra17268j

Cited by 21 publications

(11 citation statements)

References 23 publications

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“…All DSC runs were performed two times independently. The melting points of the pure ionic liquids are shown in Table , and acceptable agreement in the transition temperatures with published data has been observed for the pure compounds ([C 4 C 1 Im][NO 3 ], [C 4 C 1 Im][CH 3 SO 3 ], and [C 4 C 1 Im]Cl). − This table also presents the glass-transition and solid-phase transition temperatures determined in this work. For [C 4 C 1 Im][NO 3 ], a solid–solid transition at T = 279 K was also observed, which is in accordance with the values reported by Strechan et al The presence of polymorphs in the nitrate family of ILs has been already studied and confirmed by several authors. ,− Furthermore, the metastability of [C 4 C 1 Im]Cl was herein noticed, with the melting temperature present in the second heating cycle at T = 342 K without further crystallization in the following cycles.…”

Section: Resultssupporting

confidence: 77%

“…All of the samples, because of their hygroscopic character, were prepared in a glovebox. Thermophysical data were collected at atmospheric pressure accordingly to the method developed by Stolarska et al 31 All of the samples were initially heated from room temperature at a rate of 2.5 K min −1 . At this temperature, they were held for an isotherm of 25 min, prior to two cycles of cooling and heating at a rate of 2.5 K min −1 spaced by 10 min isothermal holding at the lower and upper end-point temperatures.…”

Section: Journal Of Chemical and Engineering Datamentioning

confidence: 99%

“…s (ur() = 0.02) for the viscosity. Cl) [31][32][33][34][35][36]. This table also presents the glass transition and the solid-phase transition temperatures determined in this work.…”

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confidence: 99%

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Physicochemical Characterization of Ionic Liquid Binary Mixtures Containing 1-Butyl-3-methylimidazolium as the Common Cation

et al. 2019

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Mixing ionic liquids (as well as mixing an inorganic salt in an ionic liquid) constitutes an easy, elegant methodology to obtain new ionic materials. In this study, three ionic liquids (ILs) sharing a common cation were synthesized and mixed in nine different proportions giving rise to twentyseven binary mixtures. Specifically, 1-butyl-3-methylimidazolium nitrate, [C4C1Im][NO3], 1butyl-3-methylimidazolium chloride, [C4C1Im]Cl, and 1-butyl-3-methylimidazolium methanesulfonate, [C4C1Im][CH3SO3], were synthetized and characterized. They all share 1-butyl-3-methylimidazolium as the common, archetypal cation. None of them (or any of their binary mixtures) is liquid at the room temperature (T = 298.15 K) and two of them are only in the liquid state above temperatures of 343-353 K. Despite belonging to commonly used families of ILs, their handling and the study of their liquid properties (neat and mixtures) has become particularly difficult, mainly due to their tendency to solidify and their high viscosity (caused by hydrogenbonded networks). The main goal of this work is to evaluate the thermal, dynamic, and volumetric properties of these compounds and their mixtures, as well as the solid-liquid equilibria of their binary mixtures. Thermal properties, such as melting and glass transition temperatures were determined or calculated. Therefore, both density and viscosity have been measured, which were used for the calculation of the isobaric thermal expansion coefficient, molar volumes, excess molar volumes and viscosity deviations to linearity.

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Section: Resultssupporting

confidence: 77%

Section: Journal Of Chemical and Engineering Datamentioning

confidence: 99%

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Physicochemical Characterization of Ionic Liquid Binary Mixtures Containing 1-Butyl-3-methylimidazolium as the Common Cation

et al. 2019

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“…Since the decomposition prevents, or at least strongly hinders, the use of direct techniques for the measurement of choline chloride melting enthalpy and temperature, a work based on an indirect approach to estimate the fusion properties of [Ch]Cl was proposed by us [44]. Based on the quasi-ideal behavior of the liquid phase of mixtures of ionic liquids [45,46] [44]).…”

Section: [Ch]cl Melting Propertiesmentioning

confidence: 99%

Insights into the Nature of Eutectic and Deep Eutectic Mixtures

2018

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A stricter definition of a deep eutectic solvent (DES) is urgent, so that it may become a sound basis for further developments in this field. This communication aims at contributing to deepening the understanding of eutectic and deep eutectic mixtures concerning their definition, thermodynamic nature and modelling. The glut of literature on DES applications should be followed by a similar effort to address the fundamental questions on their nature. This hopefully would contribute to correct some widespread misconceptions, and help to establish a stringent definition of what a DES is. DES are eutectic mixtures for which the eutectic point temperature should be lower to that of an ideal liquid mixture. To identify and characterize them, their phase diagrams should be known, in order to compare the real temperature depression to that predicted if ideality is assumed, and to define composition ranges for which they are in the liquid state at operating temperatures. It is also shown that hydrogen bonding between the DES components should not be used to define or characterize a DES, since this would describe many ideal mixtures. The future of deep eutectic solvents is quite promising, and we expect that this work will contribute to the efficient design and selection of the best DES for a given application, and to model properties and phase equilibria without which the process design is impractical.

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“…His findings revealed that phosphonium-based ILs showed relatively high CO 2 capacity in general and moderate cation-anion pairing. In addition, phosphonium-based ionic liquids are generally inexpensive and available commercially on a large scale [16]. The response surface methodology (RSM), based on central composite design (CCD), was employed to optimize and to comprehend the interactions between the operating factors affecting CO 2 removal using aqueous MEA-[TBP][MeSO 3 ] hybrid solvents with different concentrations of [TBP][MeSO 3 ].…”

Section: Introductionmentioning

confidence: 99%

An Optimization Study of Carbon Dioxide Absorption into the Aqueous Solution of Monoethanolamine and Tetrabutylphosphonium Methanesulfonate Hybrid Solvent Using RSM-CCD Methodology

et al. 2021

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The main purposes of this project are to assess and to optimize the solubility of carbon dioxide (CO2) in an aqueous 30 wt% monoethanolamine-tetrabutylphosphonium methanesulfonate (MEA-[TBP][MeSO3]) new hybrid solvent. In this study, the viscosity and density of aqueous MEA-[TBP][MeSO3] hybrid solvents containing different amounts of [TBP][MeSO4] were determined. Meanwhile, Fourier Transform-Infrared (FT-IR) Spectroscopy was used to determine the presence of carbamate in aqueous MEA-[TBP][MeSO3] to prove that CO2 was absorbed by aqueous MEA-[TBP][MeSO3]. Response Surface Methodology (RSM) based on central composite design (CCD) was used to design the experiments and explore the effects of three independent parameters on the solubility of CO2 in aqueous MEA-[TBP][MeSO3]. The three independent parameters are concentration of [TBP][MeSO3] (2–20 wt.%), temperature (30–60 °C) and pressure of CO2 (2–30 bar). The experimental data was found to fit a quadratic equation using multiple regressions and analyzed using analysis of variance (ANOVA). The final empirical equation in terms of actual factors was deducted as mol fraction = 0.5316 − (2.76 × 10−4)A − (8.8 × 10−4)B + (8.48 × 10−3)C + (2.9 × 10−5)AB + (2.976 × 10−6)AC + (5.5 × 10−5)BC − (8.4 × 10−5)A2 − (3.3 × 10−5)B2 − (1.19 × 10−4)C2, whereby A = ionic liquid ([TBP][MeSO3]) concentration, B = temperature and C = CO2 pressure. An attempt was made to perform the experiments for solubility of CO2 in aqueous MEA-[TBP][MeSO3] to validate the removal of CO2 predicted by RSM. Based on a validation study, the experimental data showed a percentage error between 0.6% and 2.11% as compared to the predicted value of CO2 removal by RSM.

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Properties modification by eutectic formation in mixtures of ionic liquids

Abstract: The composition and temperature of three eutectic mixtures of ionic liquids and their physical properties (density, viscosity, and surface tension) are presented. Melting temperature depressions of up to ca. 50 K were found with regard to those of the parent ionic liquids.

Cited by 21 publications

References 23 publications

Physicochemical Characterization of Ionic Liquid Binary Mixtures Containing 1-Butyl-3-methylimidazolium as the Common Cation

Physicochemical Characterization of Ionic Liquid Binary Mixtures Containing 1-Butyl-3-methylimidazolium as the Common Cation

Insights into the Nature of Eutectic and Deep Eutectic Mixtures

An Optimization Study of Carbon Dioxide Absorption into the Aqueous Solution of Monoethanolamine and Tetrabutylphosphonium Methanesulfonate Hybrid Solvent Using RSM-CCD Methodology

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