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Areas of energy advantage for flowsheets of separation modes for mixtures containing components with similar volatilities

https://doi.org/10.32362/2410-6593-2020-15-3-7-20

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Abstract

Objectives. The conditions for the effective application of the sharp distillation technique (without a component distributed between the distillate and bottom flows) for the separation of quaternary zeotropic mixtures containing components with similar volatilities were determined. The area of energy advantage for the flowsheet based on the preliminary fractionation of the mixture, compared with the flowsheet, the first distillation column of which works based on the indirect separation mode, was identified for an ethyl acetate–benzene–toluene–butyl acetate system. Energy savings of up to 20% were achieved. The direct and indirect distillation modes can become competitive when the point of the original composition is located near single K-surfaces or in a region with a different ratio of distribution coefficients. Sharp distillation is not suitable for the separation of a mixture containing a pair of components exhibiting relative unity volatility with medium boiling points.

Methods. The mathematical modeling in the Aspen Plus V.10.0 software package was chosen as the research method. The simulation was based on the Wilson local composition equation. The relative errors in the description of the phase equilibrium did not exceed 3%.

Results. The structure of the vapor–liquid equilibrium diagram and diagram of surfaces of the unit component distribution coefficients were studied for the ethyl acetate–benzene–toluenebutyl acetate and acetone–toluene–butyl acetate–o-xylene systems. Flowsheets based on the sharp, indirect (both systems), or direct (second system) distillation modes were proposed. The distillation process was simulated, and the parameters of the column work were determined (the quality of the substances meets the State Standard requirements of the Russian Federation for minimal energy consumption).

Conclusions. Recommendations regarding the use of sharp distillation for the separation of quaternary mixtures containing components with similar volatilities were devised.

About the Authors

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

Margarita Ye. Peshekhontseva, Student, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571



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

Mark A. Maevskiy, Postgraduate Student, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571



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

Ivan S. Gaganov, Student, Department of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow, 119571



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

Anastasiya V. Frolkova, Cand. of Sci. (Engineering), Associate Professor, Department of Chemistry and Technology of Basic Organic Synthesis, ResearcherID N-4517-2014

86, Vernadskogo pr., Moscow, 119571



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Supplementary files

1. Diagrams of the unit K-surfaces of the systems: ethyl acetate (EA)–benzene (B)–toluene (T)–butyl acetate (BA) (a) and acetone (A)–toluene (T)–butyl acetate (BA)–o-xylene (o-X) (b) at 760 mm Hg.
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2. This is to certify that the paper titled Areas of energy advantage for flowsheets of separation modes for mixtures containing components with similar volatilities commissioned to Enago by Margarita E. Peshekhontseva, Mark A. Maevskiy, Ivan S. Gaganov, Anastasiya V. Frolkova has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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  • Different types of distillation (i.e., direct, indirect, sharp) were analyzed for the separation of quaternary mixtures containing components exhibiting similar volatility.
  • The areas of energy advantage for flowsheets based on the use of the direct, indirect, and sharp distillation were allocated in composition tetrahedron.
  • Recommendations on the choice of one distillation type for the separation of quaternary mixtures were formulated.

For citation:


Peshekhontseva M.E., Maevskiy M.A., Gaganov I.S., Frolkova A.V. Areas of energy advantage for flowsheets of separation modes for mixtures containing components with similar volatilities. Fine Chemical Technologies. 2020;15(3):7-20. https://doi.org/10.32362/2410-6593-2020-15-3-7-20

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)