Phase equilibria in the system LiOH–H2O at 350–425°C

The system LiOH—H 2 O is characterized by immiscibility phenomena both in equilibrium with vapor and solid saturated solutions or without the solid phase. The solubility of LiOH increases as a result of immiscibility phenomena at ~355°C and further increases above this temperature up to the melting point. The immiscibility region (g–l 1 –l 2 ) is terminated by the critical phenomena (g = l 1 –l 2 ) at ~390°C. A separation of liquid phases is observed at elevated pressures (at ~39 MPa) and temperatures up to 425°C.