Abstract
Abstract Two processes are proposed for preparing anhydrous magnesium chloride by use of alcohols. Some alcohols can replace water to form coordinates with MgCl2, and make the dehydration of magnesium chloride much easler. The possibility of dehydration by alcohol distillation is discussed, and n-butanol was found to be the preferred solvent. For the system MgCl2–H2O–C4H9OH, the relations between temperature and liquid-gas compositions were investigated. Under optimum conditions, almost all the water can be removed by butanol distillation. After finally evaporating butanol, anhydrous magnesium chloride was obtained at a low level of MgO. Another process proposed is the preparation of anhydrous magnesium chloride from carnallite by alcohol leaching. The dehydration of carnallite (MgCl2·KCl·6H2O) is much easler than MgCl2·6H2O, but anhydrous carnallite used as bath feed will cause the accumulation of alkaline chlorides. In the present study, the solubilitles of the relevant chlorides in alcohols were determ...
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