Thermal dissociation of Ca(OH)2 at elevated pressures

The equilibrium Ca(OH)2 ⇌ CaO+H2O has been studied at pressures of steam up to 50 bars and at temperatures of up to 800° C. The dissociation pressures determined are in agreement with the data derived by some previous workers at pressures of less than one bar but they conflict with data published for higher pressures. The results can be expressed by the relation equation image over the range 530–800°c.