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

详细信息    查看全文

• 作者：Ali Haghtalab ; Aliakbar Paraj ; Babak Mokhtarani
• 关键词：Aqueous two phase system ; Salt ; Ionic liquid ; [emim][eSO4] ; NRTL-NRF ; Pitzer&ndash ; Debye&ndash ; Hü ; ckel
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：65
• 期：Complete
• 页码：83-90
• 全文大小：1010 K

文摘

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][eSO₄])-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 > Na₂SO₄ > K₂HPO₄. The experimental results are correlated successfully using a new model comprising the symmetrical Pitzer-Debye-H¨¹ckel (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][eSO₄])} + salt solutions.