ABSTRACT

The solubilities of sodium metasilicate nonahydrate (Na2SiO3*9H2O) in the NaCl H2O, KCl H2O, and NaCl KCl H2O systems were determined at the temperature range from (288.15 to 308.15) K using a dynamic method. The results show that the solubility of Na2SiO3*9H2O decreases first and then levels off with increasing concentration of NaCl from (0.17 to 4.50) mol*kg 1, whereas the solubility in the Na2SiO3*9H2O(s)-saturated KCl solution increases slightly with the addition of KCl in the concentration range from (0.20 to 3.10) mol*kg 1. The Na2SiO3*9H2O solubilities in all cases investigated were found to increase with the temperature increment. A new chemical model for the solubility has been established by the regression of the experimental solubilities data in the NaCl H2O system to obtain the parameters of the Bromley Zemaitis model. These newly obtained model parameters were applied to well predict the Na2SiO3*9H2O solubility in two other systems, namely, the KCl H2O and the NaCl KCl H2O systems, without parametrization with an average relative deviation of 1.4 % and 4.1 %, respectively.

Compounds

#	Formula	Name
1	Na2O3Si	disodium metasilicate
2	ClNa	sodium chloride
3	H2O	water
4	ClK	potassium chloride

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	Molality, mol/kg - 1 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	titration	50
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	Pycnometric method	50
POMD	1 4 3	Molality, mol/kg - 1 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	titration	40
POMD	1 4 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid Crystal of intercomponent compound 1	Pycnometric method	40

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

Determination and Modeling of the Solubility of Na2SiO3*9H2O in the NaCl KCl H2O System

Zeng, Y.[Yan], Li, Z.[Zhibao], Demopoulos, G. P.[George P.]

ABSTRACT