ABSTRACT

The enthalpies of the solution of a-alanine in water + (methanol, ethanol, 1-propanol and 2-propanol) mixtures with alcohol content up to 0.4 mole fractions, have been determined calorimetrically at T = 298.15 K. The standard enthalpies of the solution and transfer of a-alanine from water to aqueous alcohol have been calculated. The effect of structure properties of a mixed solvent on specified enthalpy characteristics of a-alanine is discussed. The enthalpy coefficients of pairwise interactions between a-alanine and alcohol molecules have been computed. It has been found that these coefficients become increasingly positive in methanol, ethanol, 1-propanol, and 2-propanol consequence. A comparative analysis of thermodynamic characteristics of dissolution of a-alanine and D, L-a-alanine in the mixtures studied has been made.

Compounds

#	Formula	Name
1	C3H7NO2	3-aminopropanoic acid
2	CH4O	methanol
3	C2H6O	ethanol
4	C3H8O	propan-1-ol
5	C3H8O	propan-2-ol
6	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 6	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Calvet calorimetry	1
POMD	2 1 6	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid	Calvet calorimetry	11
POMD	3 1 6	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid	Calvet calorimetry	11
POMD	4 1 6	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid	Calvet calorimetry	11
POMD	5 1 6	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid	Calvet calorimetry	11

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Thermochemistry of the solution of .beta.-alanine in (water + alcohol) mixtures at 298.15 K

Smirnov, V. I.[Valeriy I.], Badelin, V. G.[Valentin G.]

ABSTRACT