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Fast method for the experimental determination of vaporization enthalpy by differential scanning calorimetry |
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| Authors: | Cedeńo Fidel O Prieto Maria M Espina Aranzazu García Jose R |
| Institution: | (1) Departamento de Energía, E.T.S. de Ingenieros de Minas de Oviedo, Universidad de Oviedo, 33004 Oviedo, Spain;(2) Departamento de Energía, E.T.S. de Ingenieros Industriales de Gijón, Universidad de Oviedo, 33204 Gijón, Spain;(3) Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, 33006 Oviedo, Spain |
| Abstract: | A simple method is proposed to estimate the vaporization enthalpy of the palmitic acid (hexadecanoic acid) at its normal boiling temperature. Differential scanning calorimetry (DSC) was the technique used to directly measure these thermodynamic properties. The advantages of this method are its speed and small amount of sample required. In order to avoid evaporation and to ensure equilibrium conditions, the experiments were carried out including a-alumina in contact with the fatty acid. The effect of the alumina concentration is discussed. The obtained experimental data (Tbp=625.4±0.5 K, Dvap H=237.6±5.9 J g-1) is compared with that obtained by using thermodynamic equations. This revised version was published online in August 2006 with corrections to the Cover Date. |
| Keywords: | differential scanning calorimetry thermogravimetry enthalpy of vaporization boiling temperature palmitic acid |
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