ABSTRACT

Water activity measurements by isopiestic method have been carried out on the aqueous solutions of alanine + tri-potassium citrate (K3Cit) over a range of temperatures at atmospheric pressure. From these measurements, values of the vapor pressure of solutions were determined. The effect of temperature on the vapor liquid equilibrium of alanine + K3Cit + H2O systems has been studied. The experimental water activities have been correlated successfully with the segment-based local composition Wilson and NRTL models. The agreement between the correlations and the experimental data is good.

Compounds

#	Formula	Name
1	C3H7NO2	(S)-2-aminopropanoic acid
2	C6H7KO7	potassium dihydrogen citrate
3	C6H5K3O7	potassium citrate
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 2 4	Speed of sound, m/s ; Liquid	Molality, mol/kg - 2; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	300
POMD	1 2 4	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	300
POMD	1 3 4	Speed of sound, m/s ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	216
POMD	1 3 4	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	216

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Measurement of water activities of alanine + tri-potassium citrate + water system at temperatures between 293.15 and 313 K Experimental and modeling

Sadeghi, R.[Rahmat], Goodarzi, B.[Baharak]

ABSTRACT