The data provided in this article provides a theoretical reference for the recycling of ionic liquids. All the three salts can form aqueous two-phase system with BF 4, and C 6H 5O 7Na 3 possesses stronger salting-out ability. The two-phase systems are easier to form at lower temperatures. The root-mean-square deviation (RMSD) indicates tie-lines data fit NRTL model very well. The tie-lines data were satisfactory correlated to the equations, and show that the data is reliable. As a result, all the three empirical equations fit the binodal curves well, but some redundant parameters may be meaningless. The effective excluded volume of salt and Setschenow-type equation were used to investigate the salting-out ability of the three salts. Then, the Othmer-Tobias, Bancroft equations and NRTL model were used to fit the data. The tie-line data were determined using gravimetric method based on the lever rule. The binodal curve and tie-line data of N-ethylpyridinium tetrafluoroborate (BF 4) + organic salts ionic liquid-based aqueous two-phase systems have been studied.
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