Optimal design of extractive dividing wall column for separating benzene-cyclohexene
The high efficiency and energy-saving separation of benzene and cyclohexene azeotrope is a common industrial problem,while the EDWC(extractive dividing wall column)has a significant application prospect in the separation of azeotropes.Fewer literature was reported for separating benzene and cyclohexene by EDWC.By using choline chloride and levulinic acid with molar ratio 1∶2 as the extraction solvent,the EDWC process was explored for the separation of benzene and cyclohexene,with the optimal flow sheet designed by the PSO(particle swarm algorithm).Considering that PSO was a stochastic optimization algorithm,the coefficient of variation was introduced to evaluate its stability.Finally,three quantitative indicators of the annual total cost CTA,carbon dioxide emissions and exergy loss were calculated to comprehensively compare the EDWC process with the CED(conventional extractive distillation)process in terms of the economy,environment and thermodynamics aspects.The results show that compared with the CED process,the EDWC process can reduce CTA by 19.15％,carbon dioxide emissions by 36.08％,exergy loss by 19.99％,and extraction solvent consumption by 8.03％.The EDWC process for separating benzene and cyclohexene azeotrope has excellent separation efficiency and significant energy saving advantages.
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