Ternary (liquid+liquid) equilibria for mixtures of 1-hexyl-3-methylimidazolium (tetrafluoroborate or hexafluorophosphate)+benzene+an alkane at T=298.2 K and p=0.1 MPa

Selection of ionic liquids for the extraction of aromatic hydrocarbons from aromatic/aliphatic mixtures

“…The following imidazolium containing ionic liquids were selected: [Hmim] [37] had not yet published their results at the time when the selection was made. Otherwise, we would not have chosen this IL.)…”

“…In Table 1, aromatic distribution coefficients and aromatic/aliphatic selectivities for toluene/heptane and some other aromatic/aliphatic systems, determined by either extraction [19,34,37,43], solubility [6,15] or by activity coefficients at infinite dilution [14,19,22,23,29,32,33,40] are shown. This suggests that these ionic liquids can be used as extractants for the separation of aromatic hydrocarbons from aliphatic hydrocarbons.…”

“…The [19,35,37,43]. It is remarkable that most of the ionic liquids used for extraction of the compounds mentioned are PF 6 À -containing imidazolium-based ionic liquids.…”

LLE data for the ionic liquid 3-methyl-N-butyl pyridinium dicyanamide with several aromatic and aliphatic hydrocarbons

“…n the open literature mostly imidazolium based ionic liquids combined with anions such as [Tf 2 N] À , [CH 3 SO 4 ] À , and [BF 4 ] À are described as solvents for the extraction of aromatic hydrocarbons from aliphatic components [6][7][8][9][10][11][12][13]. For the extraction of toluene from nheptane it was recently shown that anions such as [DCA] À in combination with pyridinium cations provide superior capacity and selectivity [14].…”

Perspectives of Ionic Liquids Applications for Clean Oilfield Technologies

“…In 2001, Azko Novel patented a procedure for the extraction of an aromatic compound from an aliphatic phase using ILs (Shyu et al, 2001). To this point many papers have been published about studies of liquid-liquid equilibrium in mixtures of aliphatic and aromatic hydrocarbons (Letcher et al, 2003, Letcher et al, 2005 and in the last years spanish researchers have focused in these equilibria and in physicochemical aspects of two ternary systems comprising aliphatic/aromatic/ILs compounds (a-e. , a-b. Pereiro et al, 2009, a-c. Arce et al, 2009, a-b.…”