TY - JOUR
T1 - Liquid-Liquid Equilibria in Binary Mixtures of Dihydroxy Alcohols and Imidazolium-Based Ionic Liquids
AU - Turnaoglu, Tugba
AU - Ritchie, Sally G.
AU - Shiflett, Mark B.
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/6/25
Y1 - 2019/6/25
N2 - Binary liquid-liquid equilibria (LLE) for mixtures of dihydroxy alcohols and three imidazolium-based ionic liquids (ILs) were measured. The dihydroxy alcohols were 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol, and the ILs were 1-ethyl-3-methyimidazolium tetrafluoroborate ([C2C1im][BF4]), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2C1im][NTf2]), and 1-ethyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate ([C2C1im][TFES]). The experimental LLE data were well correlated using the nonrandom two-liquid (NRTL) activity coefficient model. All binary diol systems with [C2C1im][BF4] or [C2C1im][NTf2] have an upper critical solution temperature (UCST) between 310 and 360 K. An equimolar mixture of diols and [C2C1im][TFES] showed complete miscibility between 293.15 and 373.15 K. An increase in the alkyl chain length of the dihydroxy alcohols and/or changing the anion from [BF4 -] to [NTf2 -] for a given [C2C1im] cation results in an increase in the UCST. The excess molar volume of diols with ILs was in most cases larger than those of ordinary solutions.
AB - Binary liquid-liquid equilibria (LLE) for mixtures of dihydroxy alcohols and three imidazolium-based ionic liquids (ILs) were measured. The dihydroxy alcohols were 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol, and the ILs were 1-ethyl-3-methyimidazolium tetrafluoroborate ([C2C1im][BF4]), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2C1im][NTf2]), and 1-ethyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate ([C2C1im][TFES]). The experimental LLE data were well correlated using the nonrandom two-liquid (NRTL) activity coefficient model. All binary diol systems with [C2C1im][BF4] or [C2C1im][NTf2] have an upper critical solution temperature (UCST) between 310 and 360 K. An equimolar mixture of diols and [C2C1im][TFES] showed complete miscibility between 293.15 and 373.15 K. An increase in the alkyl chain length of the dihydroxy alcohols and/or changing the anion from [BF4 -] to [NTf2 -] for a given [C2C1im] cation results in an increase in the UCST. The excess molar volume of diols with ILs was in most cases larger than those of ordinary solutions.
UR - https://www.scopus.com/pages/publications/85073645870
U2 - 10.1021/acs.jced.9b00283
DO - 10.1021/acs.jced.9b00283
M3 - Article
AN - SCOPUS:85073645870
SN - 0021-9568
VL - 64
SP - 3179
EP - 3186
JO - Journal of Chemical and Engineering Data
JF - Journal of Chemical and Engineering Data
IS - 7
ER -