Effect of Isomerism on the Liquid–Liquid Phase Behavior of Mixtures of 1-Alkyl-3-methylimidazolium Bis((trifluoromethyl)sulfonyl)amide Ionic Liquids with Heptanol

Serra, Paulo B.P.; Shao, Xiwen; Granadero, Arnau; Rocha, Marisa A.A.; Kiefer, Johannes; Schröer, Wolffram; Růžička, Květoslav; Fulem, Michal; Rathke, B.

doi:10.1021/acs.jced.8b01203

Cited by 10 publications

(29 citation statements)

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“…Chemical stability is sometimes a problem for measurements of phase diagrams as well. 51,57,60,61 In the present study, no signs of decomposition or chemical reaction were observed in any of the systems even at the highest temperatures considered.…”

Section: ■ Introductioncontrasting

confidence: 47%

“…The phase diagrams are determined by combining the synthetic method with the cloud point method. While the procedure of sample preparation was improved during the past years, ,, the reader is referred to the most recent paper on this topic, which describes the actual state of the art in sample preparation for LLE mixtures. In brief, by using computer-assisted syringe pumps for sample sizes of 1–2 g, an overall uncertainty ( k = 2) in the mole fraction of U ( x IL ) = ± 10 –4 is achieved.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…For the sake of data integrity, samples of larger sizes were also checked and were handled in suitable Duran glass bottles using a cap and a sealing system with the same specifications (Duran Group, Mainz, Germany), each again under a protective argon atmosphere. The whole assembly enables easy handling in a temperature range of T = 225−425 K. Therefore, there was no need to leave the standard procedure of cloud point detection described in the previous studies for temperatures above 370 K. 40,51 To reach temperatures far below room temperature (T = 230−265 K), a transparent liquid bath, equipped with insulation and double-glazed windows (volume of 20 L) filled with an ethylene glycol−water mixture (60:40 v/v), was used. 63 14, 62,64 16, 62,64,65 and 18.…”

Section: ■ Introductionmentioning

confidence: 99%

“…More recently, organic molten salts melting at low temperature termed as ionic liquids gained increasing attention. − Subsequently, binary mixtures of this new class of solvents with classical solutes became a popular topic now leading to research and application of deep eutectic solvents (DES). − Nevertheless, the background knowledge regarding these systems is still insufficient. Systematic studies varying selected properties of the components are rare: among the few examples, the family of 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide– n -alkyl alcohol mixtures was comprehensively characterized. − Unfortunately, most of the investigated systems show such a high number of degrees of freedom that a detailed understanding of solubility properties of the mixtures is still challenging or even impossible. − Structure-property relationships approaches such as group contribution methods or empirical equations of high complexity often do not yield sufficient congruent results, which could serve as a reference for theory. − A self-containing description, which is in agreement with theoretical consistency, is still a challenging problem.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting the Liquid–Liquid Phase Behavior of n-Alkanes and Ethanol

et al. 2019

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Mixtures of alkanes and ethanol are important in many areas, for example, as fuel blends. This paper describes new experimental data obtained for the liquid–liquid equilibrium phase behavior of normal alkanes (n-alkanes; C n H2n+2; 9 ≤ n ≤ 24) with ethanol. The results were obtained by applying the cloud point method in a temperature range of T = 230–423 K at ambient pressure. All systems are partially miscible with an upper critical solution point. The two phase regions of the phase diagrams show no indication of any obvious optical irregularities, like birefringence, coloring, formation of schlieren, or remarkable turbidity, except critical opalescence. With increasing length of the molecular chain of the n-alkanes, the (liquid–liquid) critical point is shifted to higher temperatures and higher ethanol content. The data are analyzed numerically implying Ising criticality. The nonsymmetric shape of the phase body is considered in different approaches for describing the diameter by presuming (a) the validity of the rectilinear diameter rule, (b) a nonlinear diameter predicted in the theory of complete scaling, and (c) combining both concepts. The numerical analysis yields the critical temperature, the critical composition, the width, and the diameter of the phase diagrams. The results are compared with literature data sets from similar mixtures; these data are also evaluated in terms of the models applied here. Phase diagrams of 13 different sets of mixtures are measured and analyzed to extract general aspects of the behavior of the normal alkane–ethanol mixtures. A simple Flory–Huggins-like approach allows a semiquantitative description of the experimental results of the critical temperatures. Therefore, it confirms the picture of molecular ordering within the solutions.

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Section: ■ Introductioncontrasting

confidence: 47%