Correlations between phase behaviors and ionic conductivities of (ionic liquid + alcohol) systems

Park, Nam Ku; Bae, Young Chan

doi:10.1016/j.jct.2010.05.012

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Room-temperature ionic liquids consist of a large organic cation and an inorganic polyatomic anion, and have been very popular in recent years for their potential as “green solvents” . The structure of organic cation can affect the hydrophobicity and hydrogen bonds of ionic liquids, while the structure of the inorganic anions can affect the solubility and dissolution capacity. − The solubility between ionic liquids and water is related to cationic substituents and reduces with the increasing of alkyl chain length. − It can be seen from Figure that with the increase of mass fraction of ionic liquid, the salting effect is in the order of [BMIM] + [Ac] − > [OMIM] + [Ac] − > [EMIM] + [BF 4 ] − > [BMIM] + [BF 4 ] − . This may be due to the polarity of ionic liquids decreased and thus the hydrophobicity enhanced with the increasing length of alkyl carbon chain on the imidazolium ring from C2 to C8.…”

Section: Resultsmentioning

confidence: 99%

Process Intensification on the Supercritical Carbon Dioxide Extraction of Low-Concentration Ethanol from Aqueous Solutions

Lei

Han

et al. 2012

Ind. Eng. Chem. Res.

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Supercritical carbon dioxide (SC CO2) extraction of low-concentration ethanol from aqueous solutions was intensified by the addition of salts including inorganic solid salts and ionic liquids. The influence of operating conditions, e.g., the initial aqueous ethanol mass fraction, phase volume ratio, temperature, pressure, and the kinds of salts added on the extraction process was investigated in this work. It was found that KHCO3 is the best among all of the salts investigated, and the salting-out effect of ionic liquids is weaker than that of solid salts. The experimental results are consistent with the Hofmeister series and the prediction of COSMO-RS (conductor-like screening model for real solvent) model. This work also tried to explain the separation mechanism at the microscopic scale. FTIR (Fourier transform infrared) spectrometry and density functional theory were used to explore the complex formation and interaction force of the systems. The pretreatment process could be directly used to detect the prohibited stimulants in athletes or monitor the environmental pollutants at low concentration. This work also opens a new window for the application of ionic liquids and solid salts in sample pretreatment in laboratory rather than only limited in industry.

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