[1-Ethyl-3-Methyl-Imidazolium][EthylSulfate]-based aqueous two phase systems: New experimental data and new modelling

作者：Haghtalab Ali^*; Paraj Aliakbar; Mokhtarani Babak

来源：Journal of Chemical Thermodynamics, 2013, 65: 83-90.

DOI：10.1016/j.jct.2013.05.026

• Aqueous two phase system
• Salt
• Ionic liquid
• [emim][eSO(4)]
• NRTL-NRF
• Pitzer-Debye-Huckel

Ionic liquids (ILs), a class of organic salts comprising entirely of ions, are considered as a novel replacement for many traditional organic compounds. Among the various ILs, the alkyl-sulfate derivatives have the great advantages such as synthesizing easily in a halide-free way at a reasonable cost with relatively low viscosity and considering as a promising IL in aqueous two-phase systems (ATPSs). In this work, a new ATPS is introduced through the aqueous salt-IL solution. The effect of various inorganic salts such as K2HPO4, Na2SO4 and Na2CO3 are investigated on the phase separation of [1-Ethyl-3-Methyl-Imidazolium][Ethyl-Sulfate] ([emim][eSO(4)])-based ATPSs at T = (288.15, 298.15, and 313.15) K. The results showed that the ability of phase separation of the salt-IL based ATPS follows the order Na2CO3 %26gt; Na2SO4 %26gt; K2HPO4. The experimental results are correlated successfully using a new model comprising the symmetrical Pitzer-Debye-Huckel (PDH) equation as a long-range contribution and non-random two liquid non-random factor (NRTL-NRF) equation as a short-range contribution. The new model is applied successfully to correlate the aqueous two-phase systems of {[1-Ethyl-3-Methyl-Imidazolium][Ethyl-Sulfate] ([emim][eSO(4)])} + salt solutions.

• 出版日期2013-10