ABSTRACT

In this study, experimental liquid-liquid equilibria were studied for the {water + phosphoric acid + ester (n-propyl- and n-amyl acetates)} systems at T = (298.2, 308.2, and 318.2) K and p = 101.3 kPa. The studied systems exhibit type-1 binodal curves. Solubility curves data were measured by cloud-point titration method. Tie line measurements were carried out by acidimetric titration, the Karl Fischer technique, and refractive index measurements. Correlation of the experimental equilibrium data was carried out using NRTL and UNIQUAC thermodynamic models. The quality of the tie-lines was checked through The Othmer Tobias correlation equation. Distribution coefficients and separation factors were calculated over the biphasic regions. The experimental results indicate that n-amyl acetate is better solvent than n-propyl acetate for removal of phosphoric acid from water.

Compounds

#	Formula	Name
1	C5H10O2	propyl ethanoate
2	C7H14O2	pentyl ethanoate
3	H2O	water
4	H3O4P	phosphoric acid

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	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	4 3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mass fraction - 4; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mass fraction - 4; Liquid		Liquid	Vibrating tube method	1
POMD	1 4 3	Mass fraction - 4 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 3; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	57
POMD	1 4 3	Mass fraction - 3 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 4; Liquid mixture 2	Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	Titration method Titration method Titration method	18
POMD	2 4 3	Mass fraction - 4 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 3; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	63
POMD	2 4 3	Mass fraction - 3 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 4; Liquid mixture 2	Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	Titration method Titration method Titration method	18
POMD	1 3	Mass fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	6
POMD	2 3	Mass fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	6

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Experimental and correlated liquid-liquid equilibrium data for water-phosphoric acid-ester

Gilani, A. Ghanadzadeh, Gazani, M. Nasouri, Khanghah, B. Mohammadi, Najafgholizadeh, A.

ABSTRACT