The self-cooling effect in the process of dehydration of LiSO4•H2O, CaSO4•2H2O and CuSO4•5H2O in vacuum

The third-law method has been applied to the results of kinetic studies reported in the literature and obtained in this work to determine the E parameters of the Arrhenius equation and investigate the impact of self-cooling on the dehydration kinetics of Li2SO4.H2O, CaSO4.2H(2)O and CuSO4.5H(2)O. The values obtained (104, 98 and 88 kJ mol(-1), respectively) are about 20% higher compared to the literature data calculated by the Arrhenius-plots method. This discrepancy is connected with the severe effect of self-cooling, which can reach several ten degrees at maximum temperatures of experiments.