The dehydration of LiCl·H2O was studied under inert helium atmosphere by DTA/TG for different heating rates. The dehydration of LiCl·H2O proceeds through a two step reaction between 99–110 and 160–186°C, respectively. It leads to the formation of LiCl·0.5H2O as intermediate compound. The proposed mechanism is:
Based on the temperature peak of the DTA signals the activation energies of the two reactions were determined to be 240 kJ
mol−1 (step 1) and 137 kJ mol−1 (step 2), respectively.
The thermal decomposition of FeSO46H2O
was studied by mass spectroscopy coupled with DTA/TG thermal analysis under
inert atmosphere. On the ground of TG measurements, the mechanism of decomposition
of FeSO46H2O is:
i) three dehydration steps
ii) two decomposition
The intermediate compound was identified as Fe2(SO4)3 and the final product as the hematite Fe2O3.