Preview

Fine Chemical Technologies

Advanced search

Liquid mixtures separation and heat consumption in the process of distillation

https://doi.org/10.32362/2410-6593-2021-16-1-7-15

Full Text:

Abstract

Objectives. The aim of this study is to investigate different distillation modes of a binary ideal mixture and determine how various factors affect heat consumption in the column boilers. In addition, it intends to assess the difficulty of separating mixtures. Our research is based on analyzing the characteristics of vapor-liquid equilibrium.

Methods. To conduct our study, we used a graphic-analytical tool to calculate the distillation process of a binary mixture and mathematical models based on the Aspen Plus software package along with DSTWU, RadFrac, and the Sensitivity module. We also used the Peng-Robinson equation (PENG-ROB) to determine the liquid-vapor equilibrium.

Results. We employed the graphical method and mathematical models to obtain the operation parameters of two column variants for the distillation of binary ideal benzene-toluene mixtures. In each variant the initial mixture contained the same amount of the low- and high-boiling component. The number of plates in the column sections, reflux ratio, energy consumption, and indicators of internal energy saving were determined.

Conclusions. Study results show that using the coefficient of the component distribution between the vapor and liquid phases is a promising method for preliminary assessments of the separation difficulty and measurements of the expected heat consumption in the boilers of columns. Comparison studies showed that the heat consumption in the boiler decreases as the internal energy saving in the columns increases.

About the Authors

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

Mikhail K. Zakharov, Dr. Sci. (Eng.), Professor, N.I. Gelperin Department of Processes and Apparatus of Chemical Technology

86, Vernadskogo pr., Moscow, 119571



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

Alexandr V. Egorov, Postgraduate Student, N.I. Gelperin Department of Processes and Apparatus of Chemical Technology

86, Vernadskogo pr., Moscow, 119571



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

Alexandr A. Podmetenny, Postgraduate Student, N.I. Gelperin Department of Processes and apparatus of chemical technology

86, Vernadskogo pr., Moscow, 119571



References

1. Ainshtein V.G., Zakharov M.K., Nosov G.A., Zakharenko V.V., Zinovkina T.V., Taran A.L., Kostanyan A.E. Protsessy i apparaty khimicheskoi tekhnologii. Obshchii kurs: Uchebnik v 2-kh kn. (Processes and Apparatus of Сhemical Technologies. General course: Textbook in 2 books), 8th edition, Ainshtein V.G. (Ed.), St. Petersburg: Lan’; V. 1, 916 p., V. 2., 876 p. (in Russ.). ISBN 978-5-8114-2975-2

2. Kasatkin A.G. Osnovnye protsessy i apparaty khimicheskoi tekhnologii (Basic Processes and Apparatus of Chemical Technology). Moscow: Khimiya; 1971. 784 p.

3. Benedict M. Multistage separation processes. Chem. Eng. Prog. 1947;43(2):41–60.

4. Zakharov M.K., Martynova M.M., Prusachenkova M.I. Comparison of heat consumption in the separation of binary mixtures using distillation and rectification. Theor. Found. Chem. Eng. 2018;52(4):730–734. https://doi.org/10.1134/S0040579518040322

5. Kim Y.H. Design and control of energyefficient distillation columns. Korean J. Chem. Eng. 2016;33(9):2513–2521. https://doi.org/10.1007/s11814-016-0124-4

6. Halvorsen I.J., Skogestad S. Energy efficient distillation. J. Nat. Gas Sci. Eng. 2011;3(4):571–580. https://doi.org/10.1016/j.jngse.2011.06.002

7. Danilov R.Yu., Petlyuk F.B., Serafimov L.A. Minimum Reflux Regime of Simple Distillation Columns. Theor. Found. Chem. Eng. 2007;41(4):371–383. https://doi.org/10.1134/S0040579507040069

8. Zakharov M.K., Shvets А.А., Boichuk А.А. Calculation of Minimal Reflux Ratio for Various Cases of Rectification of Binary Mixtures. Tonk. Khim. Tekhnol. = Fine Chem. Technol. 2015;10(6):53–57 (in Russ.).

9. Koehler J., Poellmann P., Blass E. A Review on Minimum Energy Calculations for Ideal and Nonideal Distillations Model. Ind. Eng. Chem. Res. 1995;34(4):1003-1020. https://doi.org/10.1021/ie00043a001

10. Wakabayashi T., Ferrari A., Hasebe S. Design and commercial operation of a discretely heat-integrated distillation column. Chem. Eng. Res. Des. 2019;147:214–221. https://doi.org/10.1016/j.cherd.2019.04.036

11. Fidkowski Z.T., Malone M.F. & Doherty M.F. Nonideal Multicomponent Distillation: Use of Bifurcation Theory for Design. AlChE J. 1991;37(12):1761–1779. https://doi.org/10.1002/aic.690371202

12. Stichlmair J.G., Offers H. & Potthoff R.W. Minimum Reflux and Reboil in Ternary Distillation. Ind. Eng. Chem. Res. 1993;32:2438–2445.

13. Petlyuk F.B. Distillation Theory and its Application to Optimal Design of Separation Units. New York: CUP; 2004. 362 p.

14. Aleksandrov I.A. Massoperedacha pri rektifikatsii i absorbtsii mnogokomponentnykh smesei (Mass Transfer in Multicomponent Mixtures Distillation and Absorption). Leningrad: Khimiya; 1975. 320 p. (in Russ.).

15. Savchenko V.I., Gelperin N.I. Method of Calculation of Minimal Reflux Ratio in Processes of Distillation of Multicomponent Mixtures. Teor. osnovy khim. tekhnologii = Theor. Found. Chem. Eng. 1973;7(2):160–169 (in Russ.).

16. Martín M.M. Introduction to Software for Chemical Engineers. 2nd edition. CRC Press; 2019. 802 p. https://doi.org/10.1201/9780429451010

17. Luyben W.L. Distillation Design and Control Using Aspen Simulation. 2nd edition. JohnWiley & Sons, Inc.; 2013. 510 p.

18. Schefflan R. Teach Yourself the Basic of Aspen Plus™. 2nd edition. Hoboken, New Jersey: John Wiley & Sons, Inc.; 2016. 331 p.

19. Zakharov M.K., Boychuk A.A. Selecting the optimum scheme of the separation of hydrocarbon gases by distillation. Tonk. Khim. Tekhnol. = Fine Chem. Technol. 2018;13(3):2329 (in Russ.). https://doi.org/10.32362/24106593-2018-13-3-23-29

20. Zakharov M.K., Nosov G.A., Pisarenko Yu.A., Zhil’tsova L.M., Shvets A.A. Comparison of distributed heat supplies along the height of fractionating columns with conventional fractionation. Theor. Found. Chem. Eng. 2017;51(5):708–715. https://doi.org/10.1134/S0040579517050402


Supplementary files

1. Fig. 1. Graphical determination of the components’ distribution coefficient.
Subject
Type Исследовательские инструменты
View (2MB)    
Indexing metadata
2. This is to certify that the paper titled Liquid mixtures separation and heat consumption in the process of distillation commissioned to us by Mikhail K. Zakharov, Alexandr V. Egorov, Alexandr A. Podmetenny has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
Subject CERTIFICATE OF EDITING
Type Other
View (422KB)    
Indexing metadata
  • For the first time, the concept of the utilization rate of the steam flow (internal energy saving) on the trays of the distillation columns was introduced.
  • It has been proved that the internal energy saving on the plates of the strengthening section depends on the reflux number: with a reflux ratio lower than 1, the value of internal energy saving is lower than 0.5, and with a reflux ratio of exceeding 9, the value of internal energy saving exceeds 0.9.
  • Increasing the proportion of trays in the stripping column improves the internal energy saving.
  • The theory of internal energy saving allows finding a distillation option with minimal heat consumption in the reboiler.

For citation:


Zakharov M.K., Egorov A.V., Podmetenny A.A. Liquid mixtures separation and heat consumption in the process of distillation. Fine Chemical Technologies. 2021;16(1):7-15. https://doi.org/10.32362/2410-6593-2021-16-1-7-15

Views: 128


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