ABSTRACT

The binodal curves, tie-line compositions and Cloud Point data as a function of temperature and concentration were measured for aqueous two phase systems composed of acetonitrile (ACN) + K2CO3 + H2O, ACN + Na2CO3 + H2O, 1-methyl-2-pyrrolidone (NMP) + K2CO3 + H2O and NMP + Na2CO3 + H2O. Additionally, Salting-out ability of sodium sulfite, sodium thiosulfate and sodium tartrate was studied. The free energy, enthalpy and entropy of clouding point (CP) estimated using a simple method, and the driving force of the two-phase formation process was discussed on the base of the estimated free energy values. Also, an empirical equation was modified as a function of organic solvents density and dielectric constants and used for the simultaneous correlation of all experimental binodal data. Furthermore, e-NRTL and e-Wilson models were used for the correlation of tie-line compositions. The obtained results confirm the high performance of these models in the correlation of binodal and tie-line data.

Compounds

#	Formula	Name
1	C5H9NO	N-methylpyrrolidone
2	C2H3N	acetonitrile
3	CK2O3	potassium carbonate
4	CNa2O3	sodium carbonate
5	H2O	water
6	Na2O3S	sodium sulfite
7	Na2O3S2	sodium thiosulfate
8	C4H4Na2O6	disodium L-tartrate

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	3 1 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 1; Liquid Mass fraction - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	17
POMD	3 1 5	Mass fraction - 1 ; Liquid mixture 2 Mass fraction - 3 ; Liquid mixture 1 Mass fraction - 1 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 2	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	OTHER OTHER OTHER	6
POMD	3 1 5	Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	18
POMD	4 1 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 1; Liquid Mass fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	17
POMD	4 1 5	Mass fraction - 4 ; Liquid mixture 1	Mass fraction - 1; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	24
POMD	4 1 5	Mass fraction - 1 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 1 ; Liquid mixture 1	Mass fraction - 4; Liquid mixture 2	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	OTHER OTHER OTHER	6
POMD	2 3 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 3; Liquid Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	17
POMD	2 3 5	Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	20
POMD	2 3 5	Mass fraction - 3 ; Liquid mixture 2 Mass fraction - 3 ; Liquid mixture 1 Mass fraction - 2 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 2	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	OTHER OTHER OTHER	5
POMD	2 4 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 4; Liquid Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	17
POMD	2 4 5	Mass fraction - 4 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	22
POMD	2 4 5	Mass fraction - 4 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 2 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 2	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	OTHER OTHER OTHER	5
POMD	2 5 6	Mass fraction - 6 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	18
POMD	2 5 7	Mass fraction - 7 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	20
POMD	2 8 5	Mass fraction - 8 ; Liquid mixture 1	Mass fraction - 2; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	20
POMD	3 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	2
POMD	1 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	2
POMD	4 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	2
POMD	2 5	Refractive index (Na D-line) ; Liquid	Mass fraction - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	2

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Salting-out effect of sodium, potassium, carbonate, sulfite, tartrate and thiosulfate ions on aqueous mixtures of acetonitrile or 1-methyl-2-pyrrolidone: A liquid-liquid equilibrium study

Nemati-Kande, E.[Ebrahim], Shekaari, H.[Hemayat]

ABSTRACT