ABSTRACT

Phase equilibria have been measured throughout the temperature range from 283.15 to 333.15 K for the water + sodium chloride (NaCl) + ethylene glycol monopropyl ether (EGMPE) ternary system. From the experimental data, the binodal and tie-line data have been correlated with four and three empirical equations, respectively. The plait points at various temperatures were also determined. In addition, the lower critical solution temperature (LCST) of the investigated system was estimated by calculating the intersection of two fitting curves which correlated the mass fractions of EGMPE at the eutectic points with the temperature. The predicted value of the LCST approached the experimental value by using a titration method. The area, in which two liquid phases coexist, increases with increasing temperature, which was shown clearly in the tridimensional phase diagram.

Compounds

#	Formula	Name
1	C5H12O2	2-propoxyethanol
2	ClNa	sodium chloride
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	1 2 3	Mass fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 2; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	visual	58
POMD	1 2 3	Mass fraction - 1 ; Liquid	Temperature, K; Liquid Mass fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	visual	58
POMD	1 2 3	Mass fraction - 2 ; Liquid mixture 1 Mass fraction - 2 ; Liquid mixture 2 Mass fraction - 1 ; Liquid mixture 2	Temperature, K; Liquid mixture 2 Mass fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Index of refraction calibration data Index of refraction calibration data Index of refraction calibration data	21
POMD	1 2 3	Mass fraction - 2 ; Liquid mixture 2 Mass fraction - 2 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 2 Mass fraction - 3; Liquid mixture 2	Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	Index of refraction calibration data Index of refraction calibration data Index of refraction calibration data	8
POMD	1 2 3	Mass fraction - 2 ; Liquid	Temperature, K; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	visual	16

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Temperature dependence of ternary phase diagrams for water + sodium chloride + ethylene glycol monopropyl ether at atmospheric pressure

Wang, X.[Xue], Li, X.-X.[Xin-Xue], Liu, Q.[Qian], Li, D.[Dan]

ABSTRACT