Ternary liquid systems critical conditions

Problems concerning the conditions of stability of homogenous systems for critical phases in ternary systems are very similar to those for the gas-liquid phenomena in binary systems, because of two independent variables at constant temperature and pressure. The conditions for stability are (82G/dnl)T P 2 3>0 and (820, given by Equations (5.146) and (5.147), respectively. Inspection of the condition equivalent to Equation (5.148) given by Equation (5.152) shows that (82(j>/dnl)TP> 2i 3 and, therefore, it is the condition expressed by Equation (5.147) or (5.150) that determines the boundary between stable... 

The low melting eutectics in the CaO-Ca (OH) 2-CaC03 system undoubtedly explain the formation of melts in the gasifier at temperatures of 1500°-1600°F. whenever the steam pressure exceeds the critical value of 13 atm. The equilibrium data above clearly show that Ca(OH)2 cannot exist as a solid phase under these conditions at such low steam pressures. Liquids with melting points below 1600°F. must exist in the above ternary systems where the activity of Ca(OH)2(l) is sufficiently... 

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