ABSTRACT

Experimental isobaric vapor-liquid equilibrium data for the binary system of water + triethylene glycol were obtained at sub-atmospheric pressures of 53.33, 66.66, 79.99 kPa and local atmospheric pressure of 95.99 kPa over the entire composition range using a modified Sweitoslawsky-type ebulliometer. The experimental data was correlated using Wilson and NRTL models. Wilson model was found to better represent the calculation results. The measured densities and refractive indices over the entire composition range of water + triethylene glycol are reported from 293.15 to 313.15K at local atmospheric pressure of 95.99 kPa. Excess molar volume, partial molar volume and deviations in molar refractivity were evaluated and fitted to the Redlich-Kister equation. Excess molar volumes were found to be negative at all temperatures and the deviation from ideality decreased with increase in temperature. Different mixing rules were also investigated for predicting the refractive indices of the binary mixture and are reported in terms of their average percentage deviation.

Compounds

#	Formula	Name
1	C6H14O4	triethylene glycol
2	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	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	4
POMD	1	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	45
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	4
POMD	2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	45
POMD	1 2	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 2; Liquid Pressure, kPa; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	60
POMD	1 2	Mole fraction - 2 ; Gas	Mole fraction - 2; Liquid Pressure, kPa; Liquid		Gas Liquid	Chromatography	60
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125
POMD	1 2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	Standard Abbe refractometry	125

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Experimental isobaric vapor-liquid equilibrium at sub-atmospheric and local atmospheric pressures, volumetric properties and molar refractivity from 293.15 to 313.15 K of water + triethylene glycol.

Aniya, V.[Vineet], Singh, A.[Ashish], De, D.[Debiparna], Reddy, R.[Rupesh], Satyavathi, B.

ABSTRACT