ABSTRACT

The enthalpies of solution of aminomethylphosphonic acid (GlyP), 1-aminoethylphosphonic acid (AlaP), and 1-aminopropylphosphonic acid (HalaP) have been measured in water and aqueous urea solutions at 298.15 K. From the obtained experimental results, the standard enthalpies of solution of aminophosphonic acids (AP) in water urea solutions have been determined. These data were used to calculate the heterogeneous enthalpic pair interaction coefficients based on McMillan Mayer's formalism. These values were interpreted in the terms of the hydrophobic effect of the side chains of aminophosphonic acids on their interactions with a molecule of urea in water.

Compounds

#	Formula	Name
1	CH6NO3P	(aminomethyl)phosphonic acid
2	C2H8NO3P	(1-aminoethyl)phosphonic acid
3	C3H10NO3P	(1-aminopropyl)phosphonic acid
4	CH4N2O	urea
5	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	4 1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid Solvent: Molality, mol/kg - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	45
POMD	4 2 5	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 2; Liquid Solvent: Molality, mol/kg - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	42
POMD	4 5 3	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 3; Liquid Solvent: Molality, mol/kg - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	24

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

Interaction of Some Aminophosphonic Acids with Urea in Aqueous Solutions at 298.15 K

Palecz, B.[Bartlomiej], Grala, A.[Aleksandra], Kudzin, Z.[Zbigniew]

ABSTRACT