Influence of ionic liquids on the separation factor of three standard separation problems

Physico-chemical properties and phase behaviour of piperidinium-based ionic liquids

“…After the years of measurements of phase equilibria and of activity coefficients at infinite dilution we can conclude that the piperidinium-based ionic liquids could be by the similarity to pyrrolidinium-based ionic liquids [1,[19][20][21][22][23][24] very promising.…”

“…Recently, the activity coefficients of many organic solvents and water were measured in [PMPIP][NTf 2 ] [26]. The selectivities obtained for the separation of the aromatic hydrocarbons from the aliphatic hydrocarbons were on the average level, but the selectivity for the n-hexane/thiophene separation problem was quite high, S ∞ 12 = 28.6 at T = 308.15 K. The choose of anions in this work was dictated by the previous very optimistic results in the extraction with the thiocyanate-based-anion ionic liquids [16,17,[27][28][29][30] and with the bis{(trifluoromethyl)sulfonyl}imide-based-anion ionic liquids [21][22][23][24][25]. This paper is a continuation of our wide ranging investigation into ILs containing the thiocyanate anion.…”

Application of Ionic Liquids in Membrane Separation Processes

“…Gu and fellow researchers reported the extraction of taurine in 1-propyl-3-Methylimidazolium-, 1-butyl-3-methylimidazolium-, 1-amyl-3-methylimidazolium, 1-hexyl-3-methylimidazolium chloride, 1-propyl-3-methylimidazolium-, 1-butyl-3-methylimidazolium-, 1-amyl-3-methylimidazolium-, 1-hexyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium iodide, 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquids and achieved 96-98,5% separation yield in a single separation step (Gu et al, 2004). Propylene separation from propane by absorption was studied by Ortiz et al in 1-butyl-3-methylimidazolium tetrafluoroborate bulk ionic liquid membranes (Ortiz et al, 2008) and the extractive distillation of benzene/cyclohexane, 1-hexene/n-hexane, 2-propanol/water binary and the ternary systems applying 1-hexyl-3-methyl-imidazolium-and 1-butyl-1-methylpyrrolidinium bis(trifluorpmethylsulfonyl) imide was reported by Westerholt (Westerholt, et al, 2009). They all concluded that the application of ionic liquids increased the efficiency and repeatability and allowed separation for previously unsolved separation problems.…”

About the Purification Route of Ionic Liquid Precursors

“…These unique chemical properties, responsible of strongly growing interest towards ionic liquids in the last fifteen years, have addressed RTILs to a very wide variety of applications, in particular as "green" solvents for chemical reactions, bi-phasic catalysis, chemical synthesis, separation and extraction processes, advanced high-temperature lubricants, transfer fluids in solar thermal energy systems [4][5][6][7][8][9][10][11][12][13][14][15][16], and as electrolytes (or electrolyte components) for electrochemical devices including batteries, fuel cells, double-layer capacitors, hybrid super-capacitors, photo-electrochemical cells, and electroplating of electropositive metals [3,[17][18][19][20][21][22][23][24][25][26][27].…”