1992 Volume 18 Issue 5 Pages 714-722
Applying our new crystallization method to separation of xylene isomers, solidliquid equilibria (SLE) of the binary xylene isomer systems o-xylene+p-xylene and m-xylene+p-xylene were measured by both cooling curve and DSC methods. SLE data by these methods were consistent with each other. To learn the effect of a liquefied gas on the SLE for these binary systems, vapor -liquid -solid equilibria (VLSE) for the ternary systems liquefied gas (propane or chlorodifluoromethane [HCFC 22]) + binary xylene isomer systems were also measured by the cooling-curve method.
The correlated results of these VLSE data using an activity coefficient equation showed that the liquefied gas component had no capability to shift the eutectic composition of the o-xylene+p-xylene system but could shift the eutectic composition of the m-xylene+p-xylene system. The quantitative effect of addition of the liquefied gas on the eutectic composition was explained by a thermodynamically derived equation.
