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Effect of Salt Type and Alkyl Chain Length on the Binodal Curve of an Aqueous Two-Phase System Composed of Imidazolium Ionic Liquids

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Chem. Eng. Data 2018, 63, 9, 3297-3304
    Article

    Effect of Salt Type and Alkyl Chain Length on the Binodal Curve of an Aqueous Two-Phase System Composed of Imidazolium Ionic Liquids
    Click to copy article linkArticle link copied!

    • Xueyan Wu
      Xueyan Wu
      Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, PR China
      More by Xueyan Wu
    • Yang Liu*
      Yang Liu
      Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, PR China
      *Tel: +86 754 86503093; Fax: +86 754 86502726; E-mail: [email protected]
      More by Yang Liu
      Orcidhttp://orcid.org/0000-0002-5717-471X
    • Yongjie Zhao
      Yongjie Zhao
      Department of Mechanical Engineering, College of Engineering, Shantou University, Shantou, Guangdong 515063, P.R. China
      More by Yongjie Zhao
    • Kit-Leong Cheong
      Kit-Leong Cheong
      Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong 515063, PR China
      More by Kit-Leong Cheong
    Other Access OptionsSupporting Information (1)

    Journal of Chemical & Engineering Data

    Cite this: J. Chem. Eng. Data 2018, 63, 9, 3297–3304
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    https://doi.org/10.1021/acs.jced.8b00188
    Published August 7, 2018
    Copyright © 2018 American Chemical Society
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    Abstract

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    The binodal data for an aqueous two-phase system (ATPS) containing 1-alkyl-3-methylimidazolium tetrafluoroborate ([Cnmim]BF4, n = 2, 3, 4) or 1-alkyl-3-methylimidazolium chloride ([Cnmim]Cl], n = 2, 4, 6, 8, 10, 12) and inorganic salts (K2HPO4, NaH2PO4, (NH4)2SO4, and NaCl) or organic salts (sodium citrate, sodium tartrate, and sodium acetate) were widely determined at T = 298.15 K. The various binodal curves could be fitted and summarized as two kinds of empirical nonlinear equations with the lowest standard deviation (SD). The effects of the salt type and cation alkyl chain length of the ionic liquid (IL) on ATPS binodal curves were further discussed. It was displayed that the salting-out ability of different salts was a major factor in these ATPS formations. For [Cnmim]BF4-based ATPS, the salting-out ability of various salts decreased in the following order: (NH4)2SO4 > Na3C6H5O7 > Na2C4H4O6 > NaH2PO4 > NaC2H3O2 > NaCl. For the [Cnmim]Cl aqueous solution, only K2HPO4 or (NH4)2SO4 could cause the phase separation and formed ATPS, and the salting-out ability of K2HPO4 was stronger than the effect of (NH4)2SO4. The phase separation abilities of the researched [Cnmim]BF4 in the corresponding ATPS increased with the increase of cation alkyl chain length, while [C8mim]Cl had the best phase separation ability of the researched [Cnmim]Cl-based ATPS.

    Copyright © 2018 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jced.8b00188.

    • Experimental binodal curve mass fraction data for all 22 ATPS systems (PDF)

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    Cited By

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    This article is cited by 19 publications.

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    Journal of Chemical & Engineering Data

    Cite this: J. Chem. Eng. Data 2018, 63, 9, 3297–3304
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jced.8b00188
    Published August 7, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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