APPLICATION OF ANALYTICAL METHODS FOR DETERMINATION THE TECHNOLOGICAL CHARACTERISTICS OF A RECTIFICATION UNIT

UDC 66.021.3

Kalishuk Dmitriy Grigor’yevich − PhD (Engineering), Associate Professor, Assistant Professor, the Department of Processes and Apparatus for Chemical Production. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: kalishdz@belstu.by

Levdanskiy Aleksandr Eduardovich – DSc (Engineering), Professor, Head of the Department of Processes and Apparatus for Chemical Production. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: alex_levdansky@mail.ru

Saevich Nikolay Petrovich − PhD (Engineering), Associate Professor, Assistant Professor, the Department of Processes and Apparatus for Chemical Production. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: zembel@rambler.ru

Fedarovich Evgeniy Gennad’yevich – PhD student, the Department of Processes and Apparatus for Chemical Production. Belarusian State Technological University (13a Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: zhenya.fedorovich.1999@mail.ru

DOI: https://doi.org/ 10.52065/2520-2669-2025-289-7.

Key words: regeneration unit, polysulfone fiber, rectification column, sieve tray, hydrodynamic mode.

For citation: Kalishuk D. G., Levdanskiy A. E., Saevich N. P., Fedarovich E. G. Application of analytical methods for determination the technological characteristics of a rectification unit. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2025, no. 1 (289), pp. 55–62 (In Russian). DOI: 10.52065/2520-2669-2025-289-7.

Abstract

The design and operating principle of a multi-stage rectification unit for regeneration of liquid waste from polysulfone fiber production are described. The technological problems that arise during operation of the unit at its reduced productivity are indicated. It is suggested that the reason for the ineffective operation of the unit at reduced productivity is the failure mode of operation of the sieve trays of the rectification columns. It is indicated that in order to determine the technological characteristics of the operation of massexchange trays of rectification columns and their evaporators, information on the technological parameters obtained using control and measuring equipment on the said columns and auxiliary equipment of the installation is insufficient. The methods of analytical determination of process characteristics of operation of rectification columns of the unit, its evaporators and mass-exchange trays are proposed. Material balances of rectification columns at nominal and reduced productivity are calculated, and the distribution of temperatures, pressures and compositions of liquid and vapor in the columns of the unit is determined. The values of the gas load factor in the columns of the unit at nominal and reduced productivity are calculated. The critical value of this factor, characterizing the transition of the operation of the trays to the failure mode, is determined. It is proven that at reduced load the existing sieve trays of the rectification columns will operate in the failure mode. Proposals are given for modernization of the columns of the regeneration unit.

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References

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20.11.2024