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Influence of reactor temperature conditions on the recycle flow rate

https://doi.org/10.32362/2410-6593-2019-14-5-31-38

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Abstract

Objectives. The problem of optimizing chemical flow sheets according to energy costs associated with recycling flows is at present quite relevant. The current article investigates the influence of temperature conditions on the recycle flow rate, securing the specified conversion of the recycled flow sheet “reactor – separation unit.”

Methods. The study’s main method is the mathematical simulation of a recycled flow sheet based on material balance and chemical kinetics equations. This model assumes that the separation unit can form the recycle and outlet flows of any specified compositions.

Results. The mathematical model recycle flows provides the full reagent conversion of recycled flow sheet depends on the reactor type and the temperature conditions in it. It was established that the dependence of the recycle flow rate on the reactor temperature for endothermic reactions has monotonously decreasing shape. The most interesting are exothermic reactions for which the dependence of the recycle flow rate on the reactor temperature curve has a minimum. It is proved that the “reactor – separation unit” system with the plug flow reactor has lower optimal recycle flow rate than the recycled system with the continuous stirred tank reactor. For the adiabatic reactor the dependence of total conversion recycle flow rate on the inlet reactor temperature was investigated. It has been proven that the optimal recycle flow rate is equal to the minimum recycle flow rate for total conversion in the “reactor – separation unit” system.

Conclusions. It has been established that isothermal operation conditions are the best in terms of the recycle flow rate, securing the specified conversion for the system.

About the Authors

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

Sergey L. Nazanskiy, Cand. of Sci. (Engineering), Associate Professor of the Chair of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow 119571, Russia



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

Arkadiy V. Solokhin, Dr. of Sci. (Engineering), Professor of the Chair of Chemistry and Technology of Basic Organic Synthesis

86, Vernadskogo pr., Moscow 119571, Russia



References

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2. Blagov S.A. Development of steady state analysis method for recycled reaction distillation processes: Cand. of Sci. (Engineering) thesis. Moscow, 1999. 187 p. (in Russ.).

3. Solokhin A.V., Nazanskiy S.L. Using of recycling for increasing of selectivity of parallel reversible reactions. Theoretical Foundations of Chemical Engineering. 2012;46(3):288-295.

4. Raeva V.M., Frolkova A.K., Serafimov L.A. Evolution of the composition of binary azeotropes under variable external conditions. Theoretical Foundations of Chemical Engineering. 1996;30(1):21-27.

5. Timofeev V.S., Serafimov L.A., Timoshenko A.V. Principles of technology of basic organic and petrochemical synthesis. 3rd edition. Moscow: Vysshaya shkola Publ., 2010. 535 p. (in Russ.).

6. Zakgeim A.Yu. Introduction on chemical flow sheet modeling. Moscow: Khimiya Publ., 1982. 232 p. (in Russ.).


Supplementary files

1. Fig. 1. “Reactor – separation unit” recycled system: 1 – chemical reactor; 2 – reaction separation unit.
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Type Исследовательские инструменты
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For citation:


Nazanskiy S.L., Solokhin A.V. Influence of reactor temperature conditions on the recycle flow rate. Fine Chemical Technologies. 2019;14(5):31-38. https://doi.org/10.32362/2410-6593-2019-14-5-31-38

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