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Design of extractive distillation process with mixed entraineri‡

  • Aleksandra Yu Sazonova EMAIL logo , Valentina M Raeva und Alla K Frolkova
Veröffentlicht/Copyright: 11. Februar 2016
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Chemical Papers
Aus der Zeitschrift Chemical Papers Band 70 Heft 5

Abstract

The separation of two systems containing minimum boiling azeotropes (acetone-methanol and tetrahydrofuran (THF)-water) was performed using extractive distillation with a heavy boiling mixed entrainer consisting of two compounds. The entrainer constituents did not form new azeotropes with each other and with the components of the original mixture. An analysis of the mixed entrainer influence on the vapor-liquid equilibrium (VLE) and relative volatility provides an understanding of the cases in which the separation by extractive distillation (ED) in the presence of the mixed entrainer revealed energy benefits over their individual constituents. New results for application of the mixed entrainer monoethanolamine (MEA)-ethylene glycol (EG) and dimethyl-sulphoxide (DMSO)-glycerol for the separation of THF-water and acetone-methanol, respectively, are presented for the first time. The individual selective agents were chosen from the efficient entrainers discussed in the literature. The calculations were performed using the platform Aspen Plus 7.3. Different extractive distillation flowsheets are provided for the zeotropic mixed agents, viz. with two or three columns. For the ED of the binary mixtures investigated, the structures of the different separation schemes, the operating parameters of the columns, and the energy consumptions are presented and compared. The application of the mixed entrainer MEA-EG fed into the ED column with pre-mixing can be recommended, providing up to 1.7 % of energy saving for acetone-methanol separation. In the case of THF-water, the mixed entrainer DMSO-glycerol provides 0.8 % of energy saving. The separate inputs of the individual constituents of the mixed entrainer led to a significant increase in the energy consumptions of the flowsheet because of the third regeneration column, hence this flowsheet cannot be recommended for use in the separation of both mixtures.

Keywords: extractive distillation; mixed entrainer; multiple inputs; synergetic effect; energy consumption

‡Presented at the 42nd International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, Slovakia, 25–29 May 2015.

Acknowledgements.

This work was carried out according to the state task of the Russian Ministry of Education and Science no. 10.99.2014/K.

Symbols

Ftotal flowkmol h−1
Namount of theoretical trays
Npo/Enttray of original mixture/entrainer input Qreb reboiler duty kW
Sselectivity
TtemperatureK
Xcomponent mole fraction
a12relative volatility

Subscripts

DMSOdimethyl sulphoxide
EDextractive distillation
EGethylene glycol
Ententrainer
i, jcomponents of original mixture
EMAmonoethanolamine
THFtetrahydrofuran

Supplementary data

The supplementary data associated with this article can be found in the online version of this paper (DOI: 10.1515/chempap-2015-0247).

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Received: 2015-6-13
Revised: 2015-10-1
Accepted: 2015-10-22
Published Online: 2016-2-11
Published in Print: 2016-5-1

© 2016 Institute of Chemistry, Slovak Academy of Sciences

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https://doi.org/10.1515/chempap-2015-0247
Schlagwörter für diesen Artikel
extractive distillation; mixed entrainer; multiple inputs; synergetic effect; energy consumption

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  1. Original Paper
  2. Preparation and characterisation of gelatine hydrogels predisposed to use as matrices for effective immobilisation of biocatalystst‡
  3. Original Paper
  4. Photocatalytic reduction of nitro aromatic compounds to amines using a nanosized highly active CdS photocatalyst under sunlight and blue LED irradiation
  5. Original Paper
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  7. Original Paper
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  9. Original Paper
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  11. Original Paper
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  13. Original Paper
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  15. Original Paper
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  17. Original Paper
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  20. Kinetic study of non-reactive iron removal from iron-gall inks
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  23. Original Paper
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