Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
675198 | Thermochimica Acta | 2009 | 4 Pages |
Abstract
The sublimation kinetics of amino acid l-leucine is studied with the isothermal thermogravimetric (TG) analysis at temperatures between 400.7 and 517.5 K. Sublimation of l-leucine follows zero order kinetics. l-leucine begins to sublime around 423.2 K 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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Anna Lähde, Janne Raula, Jari Malm, Esko I. Kauppinen, Maarit Karppinen,