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Contact crystallization of substances from solutions using evaporating refrigerants

https://doi.org/10.32362/2410-6593-2020-15-5-7-15

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Abstract

Objectives. The aim of this study was to analyze the possibility of using contact crystallization with evaporating refrigerants for the isolation of substances from their aqueous solutions using salts [KNO3, NaI, and (NH2)2CO] as extraction examples and sucrose. Isobutane was used as a refrigerant.

Methods. The analysis of the influence of the main technological parameters (i.e., solution’s cooling temperature, initial concentration, and compressed refrigerant vapor pressure) on the separation process and identification of its regularities was performed using mathematical dependencies previously developed by N.I. Gelperin and G.A. Nosov for each stage of the contact crystallization process. The authors studied the influence of these parameters on the yield of crystalline and liquid phases, refrigerant consumption, and compressor power.

Results. The study showed that the use of evaporating refrigerants can significantly intensify the process of separating the mixture and spent refrigerant from the resulting crystalline suspension. This occurs owing to the evaporation of the liquid refrigerant that is in contact with the solution, which is accompanied by intense cooling. This process can be carried out at the temperature difference between the refrigerant and crystallizing mixture in the range of 0.5–1.0°C.

Conclusions. Contact crystallization with evaporating refrigerants can be successfully applied to separate various substances from aqueous solutions. An important advantage of this process is the relatively low refrigerant consumption because heat removal from the solution is carried out as a result of changes in the aggregate state of the refrigerant. The use of contact crystallization can also considerably simplify the equipment.

About the Authors

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

Gennadi А. Nosov, Dr. of Sci. (Engineering), Professor, N.I. Gel’perin Department of Processes and Apparatus of Chemical Technologies. Scopus Author ID 7003643516

86, Vernadskogo pr., Moscow, 119571, Russia



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

Mikhail E. Uvarov, Senior Teacher, N.I. Gel’perin Department of Processes and Apparatus of Chemical Technologies

86, Vernadskogo pr., Moscow, 119571, Russia



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Supplementary files

1. Fig. 1. Schematic diagram of contact crystallization with an evaporating refrigerant for the extraction of substances from aqueous solutions.
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2. This is to certify that the paper titled Contact crystallization of substances from solutions using evaporating refrigerants commissioned to us by Gennadi А. Nоsоv, Мikhail Е. Uvаrоv has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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  • The use of evaporating refrigerants considerably intensifies the process of separating the mixture and separating the spent refrigerant from the resulting crystalline suspension.
  • Contact crystallization with evaporating refrigerants can be successfully applied to separate various substances from aqueous solutions.
  • The advantage of this process is the relatively low refrigerant consumption because heat removal from the solution is carried out as a result of changes in the aggregate state of the refrigerant.

For citation:


Nоsоv G.A., Uvаrоv M.E. Contact crystallization of substances from solutions using evaporating refrigerants. Fine Chemical Technologies. 2020;15(5):7-15. https://doi.org/10.32362/2410-6593-2020-15-5-7-15

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ISSN 2410-6593 (Print)
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