Alkylsulfate-based ionic liquids in the liquid-liquid extraction of aromatic hydrocarbons

作者：Garcia Silvia; Larriba Marcos; Garcia Julian^*; Torrecilla Jose S; Rodriguez Francisco

来源：Journal of Chemical Thermodynamics, 2012, 45(1): 68-74.

DOI：10.1016/j.jct.2011.09.009

• Aromatic/aliphatic separation
• (Liquid plus liquid) equilibria
• Ionic liquids
• Sulfate anion

The (liquid + liquid) equilibrium data (LLE) for the extraction of toluene from heptane with different ionic liquids (us) based on the alkylsulfate anion (R-SO(4)) was determined at T = 313.2 K and atmospheric pressure. The effect of more complex R-SO(4) anions on capacity of extraction and selectivity in the liquid-liquid extraction of toluene from heptane was studied. The ternary systems were formed by [heptane + toluene + 1,3-dimethylimidazolium methylsulfate ([mmim][CH(3)SO(4)]), 1-ethyl-3-methylimidazolium hydrogensulfate ([emim][HSO(4)]), 1-ethyl-3-methylimidazolium methylsulfate ([emim][CH(3)SO(4)]), or 1-ethyl-3-methylimidazolium ethylsulfate ([emim][C(2)H(5)SO(4)])}. The degree of quality of the experimental LLE data was ascertained by applying the Othmer-Tobias correlation. The phase diagrams for the ternary systems were plotted, and the tie lines correlated with the NRTL model compare satisfactorily with the experimental data.

• 出版日期2012-2