ABSTRACT

The ternary system of K2SO4 + KH2PO4 + H2O 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 K2SO4 + KH2PO4 + H2O 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.

Compounds

#	Formula	Name
1	H2O	water
2	H2KO4P	monopotassium phosphate
3	K2O4S	potassium sulfate

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3 Crystal - 2	Pycnometric method	6
POMD	1 2 3	Mass fraction - 2 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3 Crystal - 2	Titration method	6
POMD	1 2 3	Mass fraction - 3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3 Crystal - 2	Titration method	6
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	Pycnometric method	7
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	Pycnometric method	12
POMD	1 2 3	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	Titration method	7
POMD	1 2 3	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	Titration method	12

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solid Liquid Phase Equilibrium for the Ternary System K2SO4 + KH2PO4 + H2O at (298.15 and 333.15) K

Wang, P.[Pan], Li, J.[Jun], Luo, J.[Jianhong], Jin, Y.[Yang], Yang, Z.

ABSTRACT