ABSTRACT

This study demonstrates the experimental and correlated tie line data for the aqueous solutions of butyric acid with two octanol isomers (C18H18O) at T = (298.2, 308.2, and 318.2) K and p = 101.3 +- 0.4 kPa, for the first time. The chosen isomers were 1-octanol and 2-ethyl-1-hexanol. The obvious difference between these two isomers is that the first isomer is a straight and later is a branched primary alcohol. Experimental solubility data were obtained using the cloud point method. The tie line data were determined by acidimetric titration, the Karl Fischer technique, and refractive index measurements. Both the ternary systems exhibit type-1 behavior of LLE. The tie-line data were correlated using the UNIQUAC and NRTL models. For each system, the Othmer Tobias and Hand correlations equations were used to establish the quality of the tie-line data. Distribution coefficients and separation factors were calculated over the biphasic area.

Compounds

#	Formula	Name
1	C4H8O2	butanoic acid
2	C8H18O	octan-1-ol
3	C8H18O	2-ethyl-1-hexanol
4	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	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	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	1 2 4	Mass fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 4; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	87
POMD	1 2 4	Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 4 ; 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	18
POMD	3 1 4	Mass fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 4; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	87
POMD	3 1 4	Mass fraction - 4 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1 Mass fraction - 1; 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	18

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Solubility and tie line data for the aqueous solutions of butyric acid with 1-octanol and 2-ethyl-1-hexanol at various temperatures

Gilani, A. G., Gilani, H. G., Saadat, S. L. S.

ABSTRACT