ABSTRACT

The solubility and density in the thermodynamic phase equilibria ternary system (Li2SO4+K2SO4+H2O) at 288.15 K and 0.1MPa were investigated experimentally with the method of isothermal dissolution equilibrium. This system at 288.15 K consists of two invariant points, three univariant isothermal dissolution curves; and three crystallization regions. The salt Li2SO4 K2SO4 belongs to the incongruent double salt, and no solid solution was found. Based on the Pitzer model and its extended Harvie Weare (HW) model, the mixing ion-interaction parameters of uLi,K, cLi,K,SO4 at 288.15 K and the solubility equilibrium constants Ksp of solid phases Li2SO4 H2O and Li2SO4 K2SO4, which are not reported in the literature were acquired. A comparison between the calculated and experimental results at 288.15 K for the ternary system shows that the calculated solubilities obtained with the extended HW model agree well with experimental data.

Compounds

#	Formula	Name
1	K2O4S	potassium sulfate
2	Li2O4S	lithium sulfate
3	H2O	water

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	3 1 2	Mass fraction - 1 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	gravimetric	4
POMD	3 1 2	Mass fraction - 1 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 2	gravimetric	9
POMD	3 1 2	Mass fraction - 1 ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal - 1	gravimetric	5
POMD	3 1 2	Mass fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal of intercomponent compound 2 Crystal of intercomponent compound 1	gravimetric	1
POMD	3 1 2	Mass fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal - 1 Crystal of intercomponent compound 2	gravimetric	1
POMD	3 1 2	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal of intercomponent compound 2 Crystal of intercomponent compound 1	ICP-OES	1
POMD	3 1 2	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal - 1 Crystal of intercomponent compound 2	ICP-OES	1
POMD	3 1 2	Mass density, kg/m3 ; Liquid	Mass fraction - 2; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Vibrating tube method	16
POMD	3 2	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal of intercomponent compound 1	gravimetric	1
POMD	3 2	Mass density, kg/m3 ; Liquid	Mass fraction - 2; Liquid Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	3 1	Mass fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Crystal - 1	gravimetric	1
POMD	3 1	Mass density, kg/m3 ; Liquid	Mass fraction - 1; Liquid Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Experimental determination and modeling of the solubility phase diagram of the ternary system (Li2SO4+K2SO4+H2O) at 288.15 K

Wang, S.[Shiqiang], Guo, Y.[Yafei], Li, D.[Dongchan], Tang, P.[Peng], Deng, T.[Tianlong]

ABSTRACT