and benzene. The overhead vapors from the column are partially cooled in the overhead condensers and collected in the column reflux drum. The off gas from the reflux drum flows through a vent condenser where additional liquid benzene is recovered. The vent condenser is chilled by use of high- pressure propylene refrigerant. The non-condensed vapor from the vent condenser is sent to fuel gas compressor suction drum to remove liquid hydrocarbon traces before being compressed in a fuel gas compressor then cooled before being sent to a gas header. The overhead liquid from the reflux drum is partly pumped back to the column as reflux and the rest pumped as distillate feed to the Depentanizer column. C8 aromatics product is taken off as a side draw, pumped and cooled and sent to a product tank. A fired heater which operates under balanced draft provides the column re-boiling duty. Part of the column bottom liquid is pumped to the fired heater to provide heating while the remaining liquid is pumped, cooled and fed to Clay treaters for removal of olefins and styrene. Figure 3 below depicts the flow diagram of xylene recovery column unit that was modelled.