ABSTRACT

Solubility of inorganic salts in the mixed systems containing surfactants and sodium tripolyphosphate (STPP) is very important for the production of laundry detergents. In this work we explored the solubility of NaCl, Na2SO4, and Na2CO3 in aqueous surfactant and STPP solutions using an ion selective electrode at 298.15 K. In the experiments, electromotive forces (EMF) for the ternary systems were measured using an ion-meter with a sodium ion-selective composite electrode and the relationship between the solubility and EMF was analyzed by a potentiometric analysis. The proposed method has advantages in avoiding the solid liquid separation operation and solution supersaturation. The experimental results indicated that the salting-out effect caused by surfactant and STPP can decrease the solubility of sodium salts in the aqueous systems.

Compounds

#	Formula	Name
1	ClNa	sodium chloride
2	CNa2O3	sodium carbonate
3	Na2O4S	sodium sulfate
4	C12H25NaO4S	sodium dodecyl sulfate
5	Na5O10P3	pentasodium tripolyphosphate
6	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	4 6 3	Mass fraction - 3 ; Liquid	Mass fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid Crystal of intercomponent compound 1	ion selective electrode	9
POMD	4 2 6	Mass fraction - 2 ; Liquid	Mass fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid Crystal of intercomponent compound 1	ion selective electrode	9
POMD	4 1 6	Mass fraction - 1 ; Liquid	Mass fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid Crystal - 1	ion selective electrode	9
POMD	6 3 5	Mass fraction - 3 ; Liquid	Mass fraction - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid Crystal of intercomponent compound 1	ion selective electrode	6
POMD	1 6 5	Mass fraction - 1 ; Liquid	Mass fraction - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid Crystal - 1	ion selective electrode	6
POMD	6 3	Mass fraction - 3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1	ion selective electrode	1
POMD	2 6	Mass fraction - 2 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal of intercomponent compound 1	ion selective electrode	1
POMD	1 6	Mass fraction - 1 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Crystal - 1	ion selective electrode	1

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

Determination of Solubility of Sodium Salts in Aqueous Surfactant and STPP Solutions Using an Ion Selective Electrode

Wang, X.[Xin], Zhang, Y.-N.[Ya-Na], Yu, Y.-X.[Yang-Xin]

ABSTRACT