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Liquid−Liquid Phase Behavior of Solutions of 1-Dodecyl-3-methylimidazolium Bis((trifluoromethyl)sulfonyl)amide (C12mimNTf2) in n-Alkyl Alcohols

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    Liquid−Liquid Phase Behavior of Solutions of 1-Dodecyl-3-methylimidazolium Bis((trifluoromethyl)sulfonyl)amide (C12mimNTf2) in n-Alkyl Alcohols†
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    Universität Bremen, Technische Thermodynamik, Badgasteiner Str. 1, 28359 Bremen, Germany, and Universität Bremen, FB2, Institut für Anorganische und Physikalische Chemie, Leobener Str. NWII, 28359 Bremen, Germany
    †Part of the “Sir John S. Rowlinson Festschrift”.
    * To whom correspondence should be addressed. Tel.: +49 421 218 3334. Fax: +49 421 218 7555. E-mail: [email protected]
    ‡Technische Thermodynamik.
    §Institut für Anorganische und Physikalische Chemie.
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    Journal of Chemical & Engineering Data

    Cite this: J. Chem. Eng. Data 2010, 55, 10, 4195–4205
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    https://doi.org/10.1021/je100359x
    Published July 14, 2010
    Copyright © 2010 American Chemical Society
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    Abstract

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    Liquid−liquid phase diagrams of binary mixtures of the ionic liquid 1-dodecyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide (C12mimNTf2) with n-alkyl alcohols (decan-1-ol, undecan-1-ol, dodecan-1-ol, tetradecan-1-ol, hexadecan-1-ol, octadecan-1-ol, and eicosan-1-ol) are reported. Applying the cloud-point method on a set of samples, phase diagrams were obtained at atmospheric pressure in the temperature range of (280 to 423) K. The investigated systems show partial miscibility with an upper critical solution temperature between (288 and 352) K. With increasing chain length of the alcohols, the critical point is shifted toward higher temperatures and slightly higher concentrations, while the shape of the phase diagrams is nearly unaffected. Ising criticality is presumed for the numerical analysis of the phase diagrams. The analysis yields the data of the critical point and the parameters of the width and of the asymmetry which characterize the shape of the phase diagrams. The temperature dependence of the diameter of the phase diagrams, which describes the asymmetry, is not linear as presumed by the rectilinear diameter rule of Cailletet−Mathias but, as requested by scaling theories of critical phenomena, depends also on nonlinear, nonanalytical contributions that are the leading terms when approaching the critical solution point. For the mixture of C12mimNTf2 + dodecan-1-ol the critical point was determined independently using the equal-volume criterion. Taking into account the nonlinear temperature dependence of the diameter, the data of the critical point estimated from the fit of the phase diagram are in good agreement with those determined by the equal volume criterion.

    Copyright © 2010 American Chemical Society

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    Cite this: J. Chem. Eng. Data 2010, 55, 10, 4195–4205
    Click to copy citationCitation copied!
    https://doi.org/10.1021/je100359x
    Published July 14, 2010
    Copyright © 2010 American Chemical Society
    Request reuse permissions

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