The Optimal Design of the Dividing Wall Distillation Columns - Case Study of Benzene, Toluene and Xylene Separation

Authors

1 University of Tehran

2 Sahand University of Technology

Abstract

The design of a dividing wall distillation column for the separation of the mixture of benzene, toluene and xylene has been studied to produce 99 mol% pure products. The effect of changes in the feed composition on three structures including direct sequence, indirect sequence and dividing wall column and also selection of the optimal structure on the basis of the optimization results have been studied to minimize the total annual cost. For the single column structure and equimolar feed, it has been shown that it is possible to reduce the energy consumption cost in the reboiler by about 30% and the initial investment cost by about 27% compared to the direct sequence structure. However, this is not true for all feed conditions. The dividing wall column structure always reduces energy costs, however, the indirect structure is more appropriate considering the total annual cost as the decision-making criterion when the xylene is the dominant feed component.

Keywords

References

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Iranian Chemical Engineering Journal
Volume 19, Issue 110
September and October 2020
Pages 66-80

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