• Title, Summary, Keyword: ionic liquids

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Density, refractive index and kinematic viscosity of MIPK, MEK and phosphonium-based ionic liquids and the excess and deviation properties of their binary systems

  • Lee, Kyeong-Ho;Park, So-Jin;Choi, Young-Yoon
    • The Korean Journal of Chemical Engineering
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    • v.34 no.1
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    • pp.214-224
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    • 2017
  • The density, refractive index, and kinematic viscosity were measured for extraction solvents for molybdenum: methyl ethyl ketone (MEK), methyl isopropyl ketone (MIPK), trihexyl tetradecyl phosphonium chloride ([$P_{666,14}$] [Cl]), trihexyl tetradecyl phosphonium dicyanamide ([$P_{666,14}$][DCA]) and trihexyl tetradecyl phosphonium bis (2,2,4-trimethyl pentyl) phosphinate ([$P_{666,14}$][TMPP]) at atmospheric pressure for a temperature range of 288.15-318.15 K. The experimental data were correlated using the Daubert and Danner equation, a linear equation and the Goletz and Tassion equation. In addition, the excess molar volumes ($V^E$) and the deviations in molar refractivity (${\Delta}R$) at 298.15 K were reported for the following binary systems: {$MEK+[P_{666,14}][Cl]$}, {$MEK+[P_{666,14}][DCA]$}, {$MEK+[P_{666,14}][TMPP]$}, {$MIPK+[P_{666,14}][Cl]$}, {$MIPK+[P_{666,14}][DCA]$} and {$MIPK+[P_{666,14}][TMPP]$}. The determined $V^E$ and ${\Delta}R$ values were correlated with the Redlich-Kister equation. The binary density and refractive index data at 298.15 K were also predicted using several mixing rules, and these results were then compared with the experimental data.

Equimolar Carbon Dioxide Absorption by Ether Functionalized Imidazolium Ionic Liquids

  • Sharma, Pankaj;Park, Sang-Do;Park, Ki-Tae;Jeong, Soon-Kwan;Nam, Sung-Chan;Baek, Il-Hyun
    • Bulletin of the Korean Chemical Society
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    • v.33 no.7
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    • pp.2325-2332
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    • 2012
  • A series $[C_3Omim]$[X] of imidazolium cation-based ILs, with ether functional group on the alkyl side-chain have been synthesized and structure of the materials were confirmed by various techniques like $^1H$, $^{13}C$ NMR spectroscopy, MS-ESI, FTIR spectroscopy and EA. More specifically, the influence of changing the anion with same cation is carried out. The absorption capacity of $CO_2$ for ILs were evaluated at 30 and $50^{\circ}C$ at ambient pressure (0-1.6 bar). Ether functionalized ILs shows significantly high absorption capacity for $CO_2$. In general, the $CO_2$ absorption capacity of ILs increased with a rise in pressure and decreased when temperature was raised. The obtained results showed that absorption capacity reached about 0.9 mol $CO_2$ per mol of IL at $30^{\circ}C$. The most probable mechanism of interaction of $CO_2$ with ILs were investigated using FTIR spectroscopy, $^{13}C$ NMR spectroscopy and result shows that the absorption of $CO_2$ in ether functionalized ILs is a chemical process. The $CO_2$ absorption results and detailed study indicates the predominance of 1:1 mechanism, where the $CO_2$ reacts with one IL to form a carbamic acid. The $CO_2$ absorption capacity of ILs for different anions follows the trend: $BF_4$ < DCA < $PF_6$ < TfO < $Tf_2N$. Moreover, the as-synthesized ILs is selective, thermally stable, long life operational and can be recycled at a temperature of $70^{\circ}C$ or under vacuum and can be used repeatedly.