ABSTRACT

By measuring the (vapour + liquid) equilibrium of {methanol (1) + benzene (2) + NaI} and testing the data using the ternary Gibbs Duhem equation, the experimental results of the (vapour + liquid) equilibrium with thermodynamic consistency are obtained. It is supposed that the mean activity coefficients of NaI in (methanol + benzene) mixed solvents may be represented by a power series of salt concentration (m1/2). Each parameter of the series was then obtained from the experimental results by the method of least squares. The calculated results show that the activity coefficients of NaI in (methanol + benzene) system with constant composition either decrease as the concentration increases, or decrease at first, then pass through a minimum and increase gradually again. This method is applicable to the determination of electrolytic activity coefficients in mixed non-aqueous solvents.

Compounds

#	Formula	Name
1	CH4O	methanol
2	C6H6	benzene
3	INa	sodium iodide

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	Phase	Method	#Points
POMD	1	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	1
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	1
POMD	1 2	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	6
POMD	1 2	Mole fraction - 1 ; Gas	Temperature, K; Liquid Mole fraction - 1; Liquid	Gas Liquid	Index of refraction calibration data	6
POMD	1 2 3	Boiling temperature at pressure P, K ; Liquid	Solvent: Mole fraction - 1; Liquid Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	90
POMD	1 2 3	Mole fraction - 1 ; Gas	Solvent: Mole fraction - 1; Liquid Pressure, kPa; Gas Molality, mol/kg - 3; Liquid	Gas Liquid	Index of refraction calibration data	90

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Study of activity coefficients for sodium iodide in (methanol + benzene) system by (vapour + liquid) equilibrium measurements

Yang, M.[Meifang], Leng, C.[Chunli], Li, S.[Shucai], Sun, R.[Renyi]

ABSTRACT