Influence of entrainer recycle for batch heteroazeotropic distillation

Abstract

Dehydration of isopropanol applying batch heteroazeotropic distillation with toluene as entrainer (E) is investigated. The composition of the feed is near to that of the isopropanol (A)-water (B) azeotrope. The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professional flow-sheet simulator. Three consecutive batches (one production cycle) is studied. Both operational modes (Mode I: decantation after distillation and Mode II: decantation during distillation) are simulated. For Mode II, calculations are performed both for Strategy A (distillate from the aqueous (E-lean) phase only) and Strategy B (partial withdrawal of the organic (E-rich phase), as well). The E-rich phase, the final column hold-up and the off-cut (Mode II only) are recycled to the next batch. The influence of the following parameters are determined: quantity of entrainer, reflux ratios of the steps. The variations caused by the recycling in the 2^nd and 3^rd batches are also shown. The best results (lowest specific energy demand and highest recovery of A) are obtained by Mode II, Strategy A. Recycling increases the recovery, and drastically diminishes the entrainer consumption. However, it makes the production slower and decreases the quantity of fresh feed that can be processed.

Graphical abstract

Keywords

batch distillation / heteroazeotropic distillation / operational policies / off-cut recycle / entrainer

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Acknowledgement

This work was financially supported by the Hungarian Scientific Research Fund (OTKA) (project No.: K-120083) and by the BME-Biotechnology FIKP grant of EMMI (BME FIKP-BIO). The authors thank Mr. Bence Nemeth for his help in the simulation.

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