ABSTRACT

The molar heat capacity, Cp, of aqueous 1,3-diaminopropane (DAP), 1,4-diaminobutane (DAB) and their corresponding blends with piperazine (PZ) were measured at temperatures from 303.2 K to 353.2 K by differential scanning calorimetry. The correlation of Cp of the aqueous binary mixtures with temperature and concentration was successfully described by a Redlich Kister type equation using excess molar heat capacity data. A modified Sohnel and Novotny equation was used to represent the temperature and concentration dependence of Cp of the ternary mixtures. The average absolute deviations between the experimental and the predicted Cp data were 0.2% and 0.1% for the binary and ternary mixtures, respectively. The results suggest that the experimental data presented in this work were represented well by the proposed correlations.

Compounds

#	Formula	Name
1	C3H10N2	1,3-propanediamine
2	C4H12N2	1,4-butanediamine
3	C4H10N2	piperazine
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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	11
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	11
POMD	1 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	66
POMD	2 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	66
POMD	1 3 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	44
POMD	2 3 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mass fraction - 2; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	44

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Molar heat capacity of aqueous solutions of 1,3-diaminopropane and 1,4-diaminobutane and their piperazine blends

Liang, K.-L.[Kai-Ling], Lin, Y.-F.[Yin-Feng], Leron, R. B.[Rhoda B.], Li, M.-H.[Meng-Hui]

ABSTRACT