Thermal calculation and kinetic analysis of dehydration on bischofite

To provide theoretical basis for preparative anhydrous magnesium chloride on bischofite, the dehydration of MgCl2·6H2O is studied by thermal calculation and kinetic analysis. The results show that dehydration is difficult at lower temperature and hydrolysis will take place when MgCl2·6H2O is dehydrating at higher temperature. In flowing air condition, when heating temperature is between 110℃and 200℃, MgCl2·6H2O will be changed to MgCl2·2H2O without hydrolysis. It must be carried out in a protected atmosphere if it continues to be dehydrated afterwards. Otherwise, hydrolysis would occur when it is being dehydrated.