Optimisation of the Dehydration of Isopropanol by Batch Heteroazeotropic Distillation with Off-cut Recycling

Németh, Bence and Hégely, László and Láng, Péter (2022) Optimisation of the Dehydration of Isopropanol by Batch Heteroazeotropic Distillation with Off-cut Recycling. In: The 12th International Conference Distillation & Absorption 2022, 2022. szeptember 18-21., Toulouse, Franciaország.

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Abstract

The dehydration of isopropanol (B) from a mixture containing methyl ethyl ketone (A) and toluene (E) as pollutants (E can be applied as entrainer as well) is studied by performing dynamic simulations for Mode II Strategy A of batch heteroazeotropic distillation. The goal is to minimise the batch time using the Box-complex method with a specified B recovery and purity (99.7 mol% in the residue). The optimisation variables are the reflux ratios of all distillation steps and the amount of entrainer added to the charge. The possibilities of recycling are studied. The production campaign consists of three batches. First, processing of all batches is performed with the operating parameters obtained from the optimisation of the first batch (Policy I). Second, processing of the three batches is optimised individually (Policy II); finally, the whole campaign is optimised simultaneously (Policy III). The different optimisation policies are compared on the basis of the minimal distillation time and computational intensity.

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