A simulation on separating binary system has been studied to investigate the temperature and liquid
compositions profiles in the bottom changing with time. By having temperature and liquid compositions
profiles in the bottom, one can find whether the binary mixture forms azeotropes or zeotropes mixtures.
Antoine equation has used to calculate saturated vapour pressure at atmospheric pressure. The activity
coefficient was calculated using UNlQUAC. Forward finite-difference was used to get the calculated
value of the bottom still composition at a given time starting from a given initial composition of binary
system. Several initial values of the composition binary system had been chosen to complete liquid
compositions in the bottom. The results showed that the temperature profiles of acetone-n-butanol and
ethanol-n-butanol binary system have differences characteristic from acetone-ethanol binary system.
Those can be seen from activity coefficient profile. The results showed that the binary system formed
zeotropes mixture, without having any azeotropes mixtures of its components. The results simulation
on separation binary system has been validated with hydrocarbon binary system benzene-toluene
mixture