Liquid-liquid equilibrium data for the ionic liquid N-Ethyl-pyridinium bromide with several sodium salts and potassium salts

The liquid-liquid equilibrium (lle) data for systems containing n-ethyl-pyridinium bromide ([epy]br),salt (na 2 hpo 4,k 2 hpo 4,k 2 so 4,c 4 o 6 h 4 kna),and water have been measured experimentally at t = 298.15 k and the formations of these four aqueous two-phase systems (atpss) have been discussed. also,the effective excluded volume (eev) values obtained from the binodal models for the four systems were determined and the salting-out abilities of different salts follow the order of k 2 so 4 > k 2 hpo 4 > na 2 hpo 4 > c 4 o 6 h 4 kna. the solubility data were correlated by the merchuk and other equations while the tie-line data by the othmer-tobias,bancroft,two-parameter,and setschenow-type equations. the correlation coefficients evidenced that experimental data fitted well to all these equations. these four salts were proved successfully to form atpss with n-ethyl-pyridinium bromide,making a significant contribution to the further study of this kind of atps. © 2013 yuliang li et al.