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Optimal modes of side-section flow in heat-pump-assisted extractive distillation systems for separating allyl alcohol–allyl acetate mixtures with butyl propionate

https://doi.org/10.32362/2410-6593-2021-16-3-213-224

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Abstract

Objectives. To investigate the influence of side-section flow modes on the energy efficiency of a partially thermally coupled distillation sequence (PTCDS) with a vapor recompression heat pump for the extractive distillation of an allyl alcohol–allyl acetate mixture with n-butyl propionate and identify modes under which the combined use of a PTCDS and heat pump are the most efficient.
Methods. Mathematical modeling in the Aspen Plus V10 software package was used as the main research method. The local composition equation of the non-random two-liquid model was used as a model for describing the vapor–liquid equilibrium, while the Redlich–Kwong model was used to consider the non-ideal vapor phase. When modeling the conventional extractive distillation scheme and PTCDS, parametric optimization was carried out according to the criterion of the total energy costs in the column reboilers. For the economical evaluation, Aspen Process Economic Analyzer V10.1 tools were used.
Results. For extractive distillation of a mixture of allyl alcohol (30 wt %) and allyl acetate (70 wt %) with n-butyl propionate as an entrainer, the minimum energy consumption was achieved at the same side-section flow mode for the variants of a PTCDS with and without a heat pump. The reduction in energy costs relative to the conventional scheme was 20% for the sequence without a heat pump and 38% for that with a heat pump. An economic assessment was made of the best options in comparison with the conventional extractive distillation scheme. The PTCDS with a heat pump had an advantage over the sequence without a heat pump only for long periods of operation.
Conclusions. For the extractive distillation of an allyl alcohol–allyl acetate mixture, the optimal modes for the combined use of a PTCDS with a vapor recompression heat pump coincide with the optimal modes for a PTCDS without a heat pump.

About the Authors

P. S. Klauzner
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Pavel S. Klauzner, Assistant, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571

ResearcherID AAJ-7842-2021 



D. G. Rudakov
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Danila G. Rudakov, Cand. Sci. (Eng.), Associate Professor, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571

Scopus Author ID 37018548000

ResearcherID M-5241-2014 



E. A. Anokhina
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Elena A. Anokhina, Cand. Sci. (Eng.), Associate Professor, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571

Scopus Author ID 6701718055

ResearcherID E-5022-2016 



A. V. Timoshenko
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Andrey V. Timoshenko,Dr. Sci. (Eng.), Professor, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571

Scopus Author ID 56576076700

ResearcherID Y-8709-2018 



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Supplementary files

1. PTCDS heat duty, PTCDS with HP reduced heat duty, and side flow dependence on side-stream stage.
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2. This is to certify that the paper titled Optimal modes of side-section flow in heat-pump-assisted extractive distillation systems for separating allyl alcohol–allyl acetate mixtures with butyl propionate commissioned to us by Pavel S. Klauzner, Danila G. Rudakov, Elena A. Anokhina, and Andrey V. Timoshenko has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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  • For the extractive distillation of the allyl alcohol–allyl acetate mixture with butyl propionate as an entrainer, containing 30 wt % of allyl alcohol, the co-use of a partially thermally coupled distillation sequence (PTCDS) with vapor recompression heat pumps was considered;
  • The influence of side section flow modes on the energy efficiency of a PTCDS with vapor recompression heat pump was investigated. The minimum energy consumption was achieved at the same mode of side section flow both for the variant of a PTCDS with and without a heat pump;
  • An economic analysis for the most energy efficient variants of schemes showed that the co-use of the PTCDS with vapor recompression heat pumps in the extractive distillation of the considered mixture was economically feasible only with a long service life.

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For citations:


Klauzner P.S., Rudakov D.G., Anokhina E.A., Timoshenko A.V. Optimal modes of side-section flow in heat-pump-assisted extractive distillation systems for separating allyl alcohol–allyl acetate mixtures with butyl propionate. Fine Chemical Technologies. 2021;16(3):213-224. https://doi.org/10.32362/2410-6593-2021-16-3-213-224

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