Abstract: Taking the debutane column and the carbon fivepre-separation column in the carbon five separation process as the research object, the conventional distillation process model was established by using UniSim Design software, and the thermal integration of the debutane column and the carbon five pre-separation column was carried out. The simulation results showed that the energy consumption of the condenser and the reboiler was reduced by 19.26% and 19.02%, respectively, after the optimization of the thermal integration technology. Annual operating cost and annual total costwere reduced by 19.19% and 15.05%, respectively. Based on the steady-state model, a dynamic distillation process model was established, and a dynamic control scheme was designed to investigate the effects of feed flow and feed composition on the key parameters of distillation separation process (output at the top and bottom, mass fraction of key components and temperature at the top and bottom). The results of dynamic response analysis show that the fixed reflux ratio control structure has good anti-interference performance in the separation process, and can realize the stable control of dynamic simulation.

Key words: carbon five separation, thermal integration, steady state model, dynamic control