THERMOGRAVIMETRIC STUDY OF THE DEHYDRATION REACTION OF LiCl•H2O

The dehydration of LiCl center dot H2O was studied under inert helium atmosphere by DTA/TG for different heating rates. The dehydration of LiCl center dot H2O proceeds through a two step reaction between 99-110 and 160-186 degrees C, respectively. It leads to the formation of LiCl center dot 0.5H(2)O as intermediate compound. The proposed mechanism is: LiCl center dot H2O ->(LiCl)-Li-Td, 1 center dot 0.5H(2)O+0.5H(2)O (step 1) and LiCl center dot 0.5H(2)O ->(LiCl)-Li-Td, 2+0.5H(2)O (step 2) 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.