Thermodynamics Research Center / ThermoML | Thermochimica Acta

Sublimation and vapour pressure estimation of l-leucine using thermogravimetric analysis

Lahde, A.[Anna], Raula, J.[Janne], Malm, J.[Jari], Kauppinen, E. I.[Esko I.], Karppinen, M.[Maarit]
Thermochim. Acta 2009, 482, 1-2, 17-20
ABSTRACT
The sublimation kinetics of amino acid l-leucine is studied with the isothermal thermogravimetric (TG) analysis at temperatures between 400.7 and 517.5K. Sublimation of l-leucine follows zero order kinetics. l-leucine begins to sublime around 423.2K and sublimation rate increases exponentially with increasing temperature. The vapour pressure of l-leucine is determined based on the mass loss rate showing a good correlation with literature values. Using the Arrhenius equation, the activation energy and pre-exponential factor are determined. The sublimation enthalpy and entropy are obtained using the Clausius Clapeyron equation.
Compounds
# Formula Name
1 C6H13NO2 L-leucine
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
  • Vapor or sublimation pressure, kPa ; Crystal
  • Temperature, K; Crystal
  • Crystal
  • Gas
  • Rate of evaporation
  • 5