ABSTRACT

Apparent molar volumes (V?) and heat capacities at constant pressure (Cp?) of aqueous solutions of sodium oxalate (Na2Ox), sodium succinate (Na2Suc), sodium malonate (Na2Mal), and potassium oxalate (K2Ox) were determined at 25 deg C up to their saturation limits using vibrating tube densitometry and flow calorimetry. These data were fitted using the Redlich-Rosenfeld-Meyer and Pitzer models. It was established using literature data that V? and Cp? of Na+ and K+ salts with a common anion are additive within well-defined limits even up to high concentrations. This was used to estimate hypothetical values of Cp? and V? at high ionic strengths for the sparingly soluble Na2Ox, which are required for the thermodynamic modeling of concentrated electrolyte mixtures such as Bayer process solutions. These values were in reasonable agreement with those estimated using a Pitzer model with parameters for Na2SO4(aq).

Compounds

#	Formula	Name
1	C4H4Na2O4	disodium succinate
2	C3H2Na2O4	sodium malonate
3	C2Na2O4	sodium oxalate
4	C2K2O4	potassium oxalate
5	ClNa	sodium chloride
6	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	5 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Flow calorimetry	3
POMD	5 6	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	VIBTUB:UFactor:2	3
POMD	1 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Flow calorimetry	12
POMD	1 6	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	VIBTUB:UFactor:4	12
POMD	2 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Flow calorimetry	12
POMD	2 6	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	VIBTUB:UFactor:4	14
POMD	4 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Flow calorimetry	13
POMD	4 6	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	VIBTUB:UFactor:4	13
POMD	3 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Flow calorimetry	8
POMD	3 6	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	VIBTUB:UFactor:4	7

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Heat Capacities and Volumes of Aqueous Dicarboxylate Salt Solutions of Relevance to the Bayer Process

Tromans, A.[Andrew], Konigsberger, E.[Erich], May, P. M.[Peter M.], Hefter, G.[Glenn]

ABSTRACT