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Entropy flow and energy efficiency analysis of extractive distillation processes with a heavy entrainer

Benyounes, Hassiba and Shen, Weifeng and Gerbaud, Vincent Entropy flow and energy efficiency analysis of extractive distillation processes with a heavy entrainer. (2014) Industrial & Engineering Chemistry Research, vol. 53 (n° 12). pp. 4478-4491. ISSN 0888-5885

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Official URL: http://dx.doi.org/10.1021/ie402872n

Abstract

The minimization of the entropy production is equivalent to minimizing the work or energy consumption required by a separation process. Sources of entropy creation during the extractive distillation of a minimum- and maximum boiling azeotropic mixture with a heavy entrainer are evaluated at each column stage in accordance with the second law of thermodynamics, and the distribution of entropy flow in different sections of the column is analyzed. Results show that mixing on feed trays and heat exchange in the reboiler and condenser are the main sources of entropy production. The temperature of the main feed and entrainer feed does not significantly affect the irreversibility of the process at the reference temperature of all flows. Although optimal values can be proposed to achieve a minimum isothermal work, the energy loss of the real process steadily increases with increases in the entrainer/feed flow rate ratio and reflux. The influence of the feed tray shows that product purity tends to vary inversely with energy loss.

Item Type:Article
Additional Information:Thanks to the American Chemical Society. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at Industrial & Engineering Chemistry Research website : http://pubs.acs.org/doi/abs/10.1021/ie402872n
HAL Id:hal-01153085
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université des Sciences et de la Technologie Mohamed Boudiaf d'Oran - USTO (ALGERIA)
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Deposited By: Vincent GERBAUD
Deposited On:07 Jul 2014 13:31

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