Multi-objective optimization of dividing wall column for the separation of cyclohexanone-cyclohexanol system using NSGA-Ⅱ
In order to reduce energy consumption and equipment investment in the separation process of cyclohexanone and cyclohexanol,a new process coupling the ketone column and alcohol tower into a dividing wall column(DWC)was proposed.The mixture from a certain factory was used as the feedstock.The integration of NSGA-Ⅱ with Aspen Plus via MATLAB was employed to reduce the total annual cost(TAC)and CO2 emission and optimize the operating parameters.The desired mass fraction were set at 99.5％for cyclohexanone and 99.0％for cyclohexanol,to maintain a 95.0％global recovery rate for the products.Optimization of the DWC parameters was conducted with a population size of 400 and a maximum genetic generation of 500,including a crossover rate of 0.85 and a mutation rate of 0.1.The TAC and CO2 emission kept decreasing during parameter optimization.When the population size evolved to around 400 generations,the objective function no longer changed significantly.The Pareto optimal frontier solution of the minimum TAC was selected as the optimal solution.Compared with the traditional two-tower process,this strategy resulted in a 31.49％reduction in CO2 emission and a 28.98％decrease in TAC in the separation process.
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