Because of fire hazards, large quantities of flammable liquids are often stored in outdoor

tanks. Consider a mixture of $n-$hexane and nitroethane, stored outdoors, in a chemical

plant located in a northern climate. It is undesirable to have phase separation in the stor$-$

age tank because, when pumped back into the plant for participation in a chemical proc$-$

ess, it would be necessary to remix the two liquid phases to obtain the original composi$-$

tion.

The lowest outside temperature is estimated to be $-40C.$ Is it likely that an equimolar

mixture will separate into two liquid phases at this temperature? To answer this question,

use the UNIQUAC equation. Consider possible advantages of a graphical solution.

UNIQUAC parameters are as follows: