“…Statistical thermodynamic treatment of the azeotropic phenomena is given by Prigogine and Defay (1954), Malesinski (1965), andYoshimoto (1961). Yoshitnoto has shown that the condition for azeotrope formation is expressed by the following equation, -(A + B)/ASi°< °-2°< +(A -B)/AS1° (Al) where T°is the boiling point of the pure component, AS0 is the entropy of vaporization of the pure component, and A and B are the coefficients of the expression for the excess free energy of mixing, AGe.…”