ABSTRACT

The enthalpies of solution of urea and its N-methyl-substituted analogues (methylurea, 1,1-dimethylurea, 1,3-dimethylurea, and 1,1,3,3- tetramethylurea) in water and methanol were measured at 298.15 K. Enthalpies of transfer from water to methanol were calculated. The enthalpies of transfer of methyl-substituted ureas are endothermic, the enthalpy of transfer of urea is negative. It has been concluded that the structure-making effects do not play the key role in methanol. The earlier assumption of an independent solvation of either side (alkylated or unsubstituted amino group) of the molecules is supported.

Compounds

#	Formula	Name
1	CH4O	methanol
2	H2O	water
3	CH4N2O	urea
4	C2H6N2O	methylurea
5	C3H8N2O	N,N-dimethylurea
6	C3H8N2O	1,3-dimethylurea
7	C5H12N2O	tetramethylurea

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	Phase	Method	#Points
POMD	3 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	4 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	5 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 5; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	6 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 6; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	7 2	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 7; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	3 1	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	1 4	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 5; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	1 6	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 6; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	1 7	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 7; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of transfer of urea and methyl-substituted ureas from water to methanol at 298.15K

Ivanov, E. V.[Evgeniy V.], Abrosimov, V. K.[Vladimir K.], Smirnov, V. I.[Valeriy I.]

ABSTRACT