Phase Equilibria of Hydrofluorocarbon-4310mee Mixtures with Ionic Liquids:  Miscibility of threo- and erythro-Diastereomers in Ionic Liquids

Abstract

Solubilities of hydrofluorocarbon-4310mee (threo-2,3-dihydrodecafluoropentane and erythro-2,3-dihydrodecafluoropentane) as well as their deuterated species in room-temperature ionic liquids (RTILs) have been studied. RTILs used here are 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4], and 1-ethyl-3-methylimidazolium tetrafluoroborate, [emim][BF4]. All systems showed limited miscibility, and the liquid−liquid phase equilibria (LLE) have been investigated with the volumetric and cloud-point methods. It was found that the threo-isomer is more soluble than the erythro-isomer in the present RTILs, and the LLE curves of the threo-isomers in the RTILs possess lower critical solution temperatures (LCSTs). The deuterated isotope effect on the solubility was found to be minor, but the deuterated isomers did show slightly better miscibility than the nondeuterated isomers. This trend of the isotope effect is qualitatively consistent with the case of alcohol + RTIL mixtures in the literature, although the LLE behavior is different (LCSTs vs upper critical solution temperatures (UCSTs)).

Separation of tetrafluoroethylene and carbon dioxide using ionic liquids

“…Similar to our previous observations [9,[24][25][26][27][28][29][30][31] and work by Costa Gomes et al [32] the solubility of perfluorinated compounds [30][31][32] in ionic liquids (i.e. fluorinated ionic liquids) is much lower than hydrofluorocarbons due to the lack of hydrogen-bonding.…”

“…Finally, our previous work has shown that ionic liquids are effective at separating other gas mixtures such as H 2 /CO 2 [18], SO 2 /CO 2 [19,20], H 2 S/CO 2 [21,22], N 2 O/CO 2 [23] and many different halocarbon isomers [9,[24][25][26][27][28][29]. Similar to our previous observations [9,[24][25][26][27][28][29][30][31] and work by Costa Gomes et al [32] the solubility of perfluorinated compounds [30][31][32] in ionic liquids (i.e.…”

Modeling ionic liquids and the solubility of gases in them: Recent advances and perspectives

“…Shiflett and Yokozeki, already mentioned for their use of the Redlich-Kwong equation, have also used NRTL in some of their contributions, in order to correlate their measured data and to model the LLE of refrigerants and fluorinated compounds in imidazolium ionic liquids [72][73][74][75][76][77][78][79]. Several other groups [80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97] have also employed the NRTL equation to study the vapor-liquid and liquid-liquid equilibria of hydrocarbons and water in ILs, being able to correlate the data with a good degree of accuracy.…”

Phase equilibria of imidazolium ionic liquids and the refrigerant gas, 1,1,1,2-tetrafluoroethane (R-134a)

“…Shiflett, Yokozeki and coworkers [11][12][13][14][15][16][17][18] have reported the majority of known low- [Tf2N] and R-134a adapted from the data of Ren and Scurto [3] and the vapor pressure of R-134a by Lemmon et al [37]. pressure equilibria data.…”