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Abstract
The vaporization of NiCl2 packed beds has been investigated under N2 or He in the 702-832°C range by thermogravimetric (TGA) technique. The influences of both surface kinetic and mass transfer factors are observed and analyzed. The activation energy is found to be 218.4 kJ/mole which is very close to the standard enthalpy change for vaporization 215.8 kJ/mole. The vaporization coefficient is low: 3.25 x 10-8. This is attributed to the large difference between the activation entropy of 36.75 J/mole-K and the standard entropy change for vaporization of 173.44 J/mole-K.