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Optimisation of Pressure of the Pressure-Swing Distillation of a Maximum Azeotropic Mixture

Hégely, László and Láng, Péter (2021) Optimisation of Pressure of the Pressure-Swing Distillation of a Maximum Azeotropic Mixture. In: PRES'21, 2021. okt. 31.-nov.3., Brno, Csehország. (In Press)

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Abstract

The separation of the maximum-boiling azeotropic mixture water-ethylenediamine by pressure-swing distillation is studied by rigorous simulation and optimisation. Contrary to our former works, the top pressure of the high-pressure column is included as an optimisation variable, as well. First, the total annualised cost (TAC) of the process without Heat Integration is minimised, then different options to reduce the energy demand of the process are applied: partial and full Heat Integration and vapour recompression heat pumps. The different heat-integrated processes are optimised first by optimising only the operational parameters, then with a genetic algorithm (GA; coupled to a flow-sheet simulator) the geometrical parameters (e.g. number of trays), as well. Heat pumps are applied either for only one or both of the columns. The flow rate of the working fluid is optimised to minimise the compressor work (reduction of 24 %). The environmental impact of the different options is evaluated by calculating their CO2 emissions and Eco-indicator 99 (EI99) values. The optimal pressure does not significantly depend on the application of Heat Integration. The lowest TAC is obtained by the optimal partial Heat Integration, which decreased TAC by 16 % compared to the optimal non-heat integrated process. Although the application of heat pumps is not economical, it is very favourable from the environmental point of view: CO2 emissions and EI99 can be reduced by 44 and 95 %, respectively.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology / alkalmazott, műszaki tudományok > TJ Mechanical engineering and machinery / gépészmérnöki tudományok
T Technology / alkalmazott, műszaki tudományok > TP Chemical technology / vegyipar, vegyészeti technológia
Depositing User: Dr László Hégely
Date Deposited: 29 Sep 2021 13:45
Last Modified: 31 Dec 2022 00:16
URI: http://real.mtak.hu/id/eprint/131541

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