Extraction of alcohols from water with 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide

Structural effects of polyethers and ionic liquids in their binary mixtures on lower critical solution temperature liquid-liquid phase separation

“…Such a tendency in miscibility is the same as that observed in alcohol/IL binary systems. [19][20][21] The nature of ILs is largely influenced by the anion structures; therefore, the choice of an anion is another factor that determines the LCST phase behavior.…”

“…An increase in the miscibility of imidazolium ILs with longer alkyl chains was also observed in other binary mixture systems, alcohol/IL systems and polymethacrylate/IL systems. [19][20][21][28][29][30][31][32][33][34][35][36] LCST phase separation of binary mixtures is governed by the magnitude of negative enthalpy and negative entropy changes of mixing (vide infra). A large decrease in the latter results in lower phase separation temperatures.…”

“…This is a common way of measuring the temperature at which liquid-liquid phase separation occurs. [19][20][21] The phase separation temperature is also called the cloud point. We repeated turbidity measurements at least three times, and confirmed that the phase transition temperature for each measurement is within 0.2 1C.…”

“…[16][17][18] Brennecke and co-workers have examined the phase behavior of IL/alcohol mixtures thoroughly and revealed their upper critical solution temperature behavior. [19][20][21] Other binary systems such as IL/haloalkane, 22,23 IL/CO 2 , 24,25 IL/ IL 26,27 and IL/synthetic polymer [28][29][30][31][32][33][34][35][36] systems have also exhibited unique phase behavior. This unique phase behavior has not only given us a better understanding of ILs but has also highlighted their potential for use in several applications, for example, in separation and purification processes and stimuli-responsive polymers.…”

Biobutanol from Renewable Agricultural and Lignocellulose Resources and Its Perspectives as Alternative of Liquid Fuels

“…An extraction procedure used 1-butyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide or 1-butyl-3-methylimidazolium hexafluoro-phosphate ionic liquids was developed by Eom et al [148]. Knowledge of phase behaviour of ionic-liquid-butanol-water systems is essential in selection the appropriate solvent [149,150]. The 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide exhibits Type 2 liquid-liquid equilibrium behavior toward butanol-water system, thus this ionic liquid can easily separate 1-butanol from water [150].…”