The transient nature of batch distillation allows for configuring of batch columns in a number of different ways. In this work, a simplified design of reactive batch distillation in middle vessel columns is presented. The shortcut procedure provides a fast and reasonable accurate design tool for emerging reactive batch distillation columns. To show the efficiency of the conceptual design approach, we applied it to a new operation mode for reactive batch distillation in middle-vessel columns. In this new configuration, the feed mixture is loaded into the middle vessel between the two separation sections, and the products are simultaneously obtained from the top and the bottom of the column reducing the way of separation. The special feature of this novel operation mode lies on the fact that depending on the characteristics of the reaction mixture, the reaction will also take place either along the upper column or along the lower column. In the former case, the reaction will be enhanced by adding one of the educts into the top of the column. In the latter, the educt feed will be supplied to the reboiler of the lower column, and the most volatile components will be evaporated out of the lower column towards the upper column through a vapour bypass configuration during the batch.

The conceptual design is able to analyze this case study all the way from determination of both reactive and distillation regions to the calculation of minimum reflux, minimum number of (reactive) stages, and maximum feasible separation task. The total batch time and the overall amount of energy consumed by the novel operation mode are also considered in comparison with the conventional operation modes. The design and feasibility of this new operation mode is studied through application to an industrial reactive batch distillation processes. The results are analyzed with simulation studies based on a dynamic rigorous detailed model coded in gPROMSŪ.