In view of the separation of cyclohexane and cyclohexene in the product of partial hydrogenation of benzene to cyclohexene,an extractive dividing wall column(EDWC)process based on conventional extractive distillation process was proposed.The separation of cyclohexane and cyclohexene was carried out by conventional extractive distillation and EDWC with dimethyl sulfoxide as extractant.The equivalent and strict models of conventional extractive distillation and EDWC three-column process were established by using Aspen Plus software,and the univariate analysis was carried out to obtain initial values for simulation.Based on multi-objective evolutionary algorithm(NSGA-Ⅱ),the multi-objective optimization of EDWC process was carried out,Pareto optimal solutions were obtained,and a set of solutions with the minimum annual total cost(TAC)and CO2 emission were selected and compared with the conventional extraction distillation process.The simulation calculation results showed that compared with the conventional extraction distillation process,EDWC process could save TAC by 9.46％and reduce carbon emission by 17.25％.The results also revealed that the EDWC process was an effective energy-saving and carbon reduction method for separating cyclohexane and cyclohexene.
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