In this study

the performance of conventional extractive distillation

heat integrated pressure-swing extractive distillation

and extractive dividing wall column distillation is investigated for the separation of benzene and cyclohexane with furfural as entrainer. Based on steady state design

the dynamic control of these three systems is studied with assistance of Aspen Dynamics

and several control structures for each system are presented to handle the feed flow rate and feed composition disturbances. The dynamic simulation results reveal that

for the conventional extractive distillation process

control structure with reboiler duty being proportional to the feed flow rate shows its superiority when it comes to the feed disturbances. In the heat integrated pressure-swing extractive distillation process

the system is sensitive to the pressure. For this reason

pressure-compensated temperature control scheme is proposed based on another control structure

and its dynamic responses reveal that the feed disturbances can be objected effectively. For the extractive dividing wall column distillation process

control structure without vapor split ratio as a manipulated variable

which is easier for to be realized in industrial production and can maintain the product purities at their specifications

is chosen rather than the one with vapor split ratio.