Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography

Abstract

Partition coefficients of 51 organic compounds in two ionic liquids (IL), 1-ethyl-3-methylimidazolium dicyanamide and trimethylhexylammonium bis((trifluoromethyl)sulfonyl)amide, were measured using inverse gas chromatography from (322.5 to 352.5) K. These partition coefficients were converted into water-to-IL partition coefficients using the corresponding gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the Abraham solvation parameter model with cation-specific and anionspecific equation coefficients. The derived equations correlated the experimental gas-to-IL and water-to-IL partition coefficient data to within (0.12 and 0.14) log units, respectively.

Study of Ether-, Alcohol-, or Cyano-Functionalized Ionic Liquids Using Inverse Gas Chromatography

“…The magnitude of activity coefficients obtained with 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide is significantly higher than the corresponding values for ether derivatized-imidazolium ILs. [29][30][31][32][33][34][35][36][49][50][51][52] Selectivities at infinite dilution S 12 ∞ are listed in Table 5 for four separation problems: hexane/benzene, hexane/methanol, hexane/thiophene, and cyclohexane/thiophene for ILs at T ) 323.15 K: Linear SolWation Energy Relationship (LSER) Characterization. The experimental data measured here can be used to calculate the Abraham model ion-specific equation coefficients for ILs studied for both the gas-to-IL (see eq 1) and the waterto-IL (see eq 2) partitioning processes.…”

Activity Coefficients at Infinite Dilution for Organic Solutes Dissolved in Three 1-Alkyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquids Bearing Short Linear Alkyl Side Chains of Three to Five Carbons

“…The magnitude of the different types of solute− IL interactions depends upon the polarity, polarizability, and hydrogen-bonding functional groups contained in both the solute and IL solvent molecules. For ionic liquid solvents, Sprunger et al 25,26 suggested a modified form of the Abraham model to describe solute transfer from the gas phase to the ionic liquid solvent: (3) and to describe solute transfer from water to the ionic liquid solvent: …”

Thermochemical investigations of solute transfer into ionic liquid solvents: updated Abraham model equation coefficients for solute activity coefficient and partition coefficient predictions

“…[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The ion-specific equation coefficients can be combined to allow one to predict solute [40], were used to derive Abraham model log K and log P correlations at 298 K and 323 K. As part of the present study we have also updated the cation-specific and anion-specific equation coefficients published in our earlier papers. The last major revision of the numerical values of the coefficients occurred slightly more than three years ago and was based on a total of 1790 log K and 1760 log P values.…”

“…[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The basic model describes solute transfer to an IL solvent both from the gas phase (Eqns. 1 and 2):…”