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TWO-STAGE RECRYSTALLIZATION WITH THE REGENERATION OF THE SOLVENT

https://doi.org/10.32362/2410-6593-2017-12-1-50-56

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Abstract

In this paper we propose an option of an energy-saving scheme for the two-stage recrystallization of substances from aqueous solutions with regeneration of the solvent from the final solutions by evaporation using a closed-type heat pump and recuperative heat exchange between the mass flows. Theoretical equations describing this process were derived. On the basis of these dependences we carried out analysis of the impact of some parameters on potassium nitrate recrystallization from aqueous solutions. It was found that the regeneration of the solvent from the final solutions allows reducing significantly the consumption of fresh solvent for the purification process. It was shown that the use of heat pumps at the stage of the solvent extraction from the final solutions combined with recuperative heat exchange between the mass flows is energetically most advantageous in most technological regimes. This is confirmed by high values of the energy conversion coefficient and low values (<1) of relative consumption of reference fuel. It was found that an additional stage of the product crystallization of from the evaporated solution allows increasing the output of refined products almost by a factor of 1.3. This has a positive effect on the technical and economic indicators of the purification process.

About the Authors

G. А. Nоsоv
Moscow Technological University (Institute of Fine Chemical Technologies)
Russian Federation
Moscow 119571, Russia


М. Е. Uvаrоv
Moscow Technological University (Institute of Fine Chemical Technologies)
Russian Federation
Moscow 119571, Russia


References

1. Gel’perin N.I., Nosov G.А. Fundamentals of engineering fractional crystallization. Moscow: Khimiya, 1986. 304 p. (in Russ.).

2. Matusevich L.N. Crystallization from solutions in chemical industry. Moscow: Khimiya, 1968. 304 p. (in Russ.).

3. Mulliny W. Crystallization. Oxford: Heinemann, 2001. 594 p.

4. Nosov G.А., Uvarov M.E., Myasoedenkov V.M. Recrystallization of substances from solutions by the use of heat pump // Vestnik MITHT (Fine Chemical Technologies). 2009. V. 4. № 1. P. 64–68. (in Russ.).

5. Nosov G.А., Uvarov M.E., Myasoedenkov V.M. Recrystallization of substances from solutions with the regeneration of the solvent by evaporation // Teplovye processy v tekhnike (Heat processes in engineering ). 2011. № 4. P. 187–192. (in Russ.).

6. Ainshtein V.G., Zakharov М.К., Nosov G.А. [et al.] General course of processes and apparatuses of chemical technology. Moscow: Terеvinf, 2015. 1784 p. (in Russ.).

7. Yantovskiy Е.I., Levin L.А. Industrial heat pumps. Moscow: Energoizdat, 1989. 128 p. (in Russ.).


For citation:


Nоsоv G.А., Uvаrоv М.Е. TWO-STAGE RECRYSTALLIZATION WITH THE REGENERATION OF THE SOLVENT. Fine Chemical Technologies. 2017;12(1):50-56. (In Russ.) https://doi.org/10.32362/2410-6593-2017-12-1-50-56

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