ABSTRACT

The densities at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K and sound velocities at T = 298.15 K have been measured for aqueous solutions of urea, N-methylurea, N,N -dimethylurea, N,N,N N -tetramethylurea, N-ethylurea, N,N -diethylurea, N-butylurea. From these data the apparent molar volumes, VU the apparent molar isentropic compressions, KS,U, and the Passynski solvation numbers of solutes have been determined. The concentration dependencies of the calculated quantities and their limiting values are discussed in terms of solute solvent and solute solute interactions.

Compounds

#	Formula	Name
1	CH4N2O	urea
2	C2H6N2O	methylurea
3	C3H8N2O	1,3-dimethylurea
4	C5H12N2O	tetramethylurea
5	C3H8N2O	ethylurea
6	C5H12N2O	1,3-diethylurea
7	C5H12N2O	N-butylurea
8	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	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	32
POMD	1 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	1 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	2 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	2 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	3 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	3 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	4 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	4 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	5 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	5 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	6 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 6; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	6 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 6; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5
POMD	7 8	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 7; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	30
POMD	7 8	Speed of sound, m/s ; Liquid	Molality, mol/kg - 7; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pulse-echo method	5

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Densimetric and ultrasonic characterization of urea and its derivatives in water

Krakowiak, J.[Joanna], Wawer, J.[Jaroslaw], Panuszko, A.[Aneta]

ABSTRACT