ABSTRACT

In this work, solubility data of 1,3-dimethylurea (DMU) in methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol were measured by synthetic method from (T = 288.15 to 328.15 K) at ordinary pressure. It turned out that the solubility data increased as temperature and solvent polarity increased. The molecular interactions in solution have been studied by the linear energy relationship. Furthermore, based on two thermodynamic models (i.e. modified Apelblat and Wilson), the experimental results were fitted and analyzed. Finally, the thermodynamic properties of solution, including entropy, enthalpy and Gibbs energy were calculated. These results indicate that in all selected solvents the dissolution behavior were endothermic, entropy-driven and not spontaneous.

Compounds

#	Formula	Name
1	C3H8N2O	1,3-dimethylurea
2	CH4O	methanol
3	C2H6O	ethanol
4	C3H8O	propan-1-ol
5	C4H10O	butan-1-ol
6	C5H12O	pentan-1-ol
7	C6H14O	hexan-1-ol
8	C7H16O	heptan-1-ol
9	C8H18O	octan-1-ol

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	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	9	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	2 1	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	6 1	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	3 1	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	1 7	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	4 1	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	1 8	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	5 1	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9
POMD	1 9	Mole fraction - 1 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	Titration method	9

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

Thermodynamics of 1,3-dimethylurea in eight alcohols

Zhu, P.[Peipei], Chen, Y.[Yanxin], Zhou, Y.[Yanan], Xiao, Y.[Yan], Ouyang, J.[Jinbo], Huang, X.[Xin], He, G.[Gaohong], Hou, B.[Baohong], Chen, W.[Wei]

ABSTRACT