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Chapter 6. Extractive distillation

Gerbaud, Vincent and Rodríguez-Donis, Ivonne Chapter 6. Extractive distillation. (2014) In: Distillation: equipment and processes. (Distillation Book. Vol. II). Elsevier, Oxford, GB, 201-246. ISBN 978-0-12-386878-7

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The design and synthesis of extractive distillation rely upon the knowledge of residue curve map topology and the calculation of univolatility curves to analyze the volatility order of the mixture. Contrary to common belief, light, intermediate, heavy, and heterogeneous entrainers can be used to separate minimum- or maximum-boiling azeotropes and low-relative-volatility mixtures. After a preliminary selection of candidate entrainers based on selectivity and entrainer capacity, a general feasibility criterion enables one to find attainable products and suitable process configurations with the entrainer fed at a different location than the main mixture to be separated, inducing an extractive section within the column. It shows that the most or the least volatile component is recovered from a direct or an indirect split-column configuration in the distillate or in the bottom stream, respectively. Batch and continuous operations are governed by the same entrainer selection rules, but the operating parameter value ranges for the entrainer-feed flow rate ratio and the reflux ratio are different.

Item Type:Book Section
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Instituto Superior de Tecnologias y Ciencias Aplicadas - InSTEC (CUBA)
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Deposited On:12 Jan 2015 13:47

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