Phase behaviors of aqueous biphasic systems (ABSs) composed of 1-butyl-3-methyl imidazolium tetrafluoroborate ([bmim]BF 4 ) + sucrose/maltose + water were reported in this work. Phase diagrams, including binodal curves, tie-lines, and the slope of tie-line (STL) were obtained at temperatures of T ) (278. 15, 288.15, 298.15, and 308.15) K. The binodal curve data were correlated using an empirical equation, and the tie-line data were correlated according to Othmer-Tobias and Bancroft equations. Good agreements with the experimental data were obtained, and results showed that these equations can be satisfactorily used to correlate the experimental data of the investigated systems at the given temperatures.
The ternary system of K 2 SO 4 + KH 2 PO 4 + H 2 O at (298.15 and 333.15) K was investigated by the method of isothermal solution saturation and moist residues. Thus the solubility data of the system were obtained, and phase diagrams of K 2 SO 4 + KH 2 PO 4 + H 2 O at (298.15 and 333.15) K were constructed on the basis of the solubility data. The solid phase in the system mentioned above was also identified. The crystallization field of potassium sulfate and potassium dihydrogen phosphate (KDP) were determined, and the crystallization field of potassium sulfate was larger than that of potassium dihydrogen phosphate. The density of saturated solutions for the systems studied at (298.15 and 333.15) K was also measured. The solubility data, density, and the phase equilibrium diagrams for the ternary system can provide the fundamental basis for the preparation of potassium dihydrogen phosphate in potassium sulfate and potassium dihydrogen phosphate aqueous mixtures.
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