Economic and environmental evaluation of heat pump-assisted pressure-swing distillation of maximum-boiling azeotropic mixture water-ethylenediamine

Ferchichi, Mariem and Hégely, László and Láng, Péter (2021) Economic and environmental evaluation of heat pump-assisted pressure-swing distillation of maximum-boiling azeotropic mixture water-ethylenediamine. ENERGY, 239 (E). No. 122608. ISSN 0360-5442

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Abstract

Different options to reduce the energy demand of a pressure-swing distillation process for separating the maximum-boiling azeotropic mixture water (A)-ethylenediamine (B) are studied by rigorous simulation. The total annualised cost (TAC) without any energy demand reduction option is minimised by a genetic algorithm coupled to a flow-sheet simulator, then the options partial (PHI) and full heat integration (FHI), and vapour recompression heat pumps (VRC) were studied. Heat pumps are applied either for only one (the high- or the low-pressure) or both columns. By optimising the flow rate of the working fluid of heat pumps, the compressor work, thus the energy demand and capital cost of the heat pump are considerably reduced. For the steam and electricity prices used, the optimised PHI is the most economical, reducing the TAC by 23.7%. The influence of these prices on the TAC of each configuration is also studied. The environmental evaluation is performed by calculating CO2 emissions and Eco-indicator 99 values. Heat pump-assisted processes have lower values compared to the other configurations, especially with optimal working fluid flow rate. PHI or FHI leads to a reduction of both above indicators, but they are still higher than those of heat pump-assisted processes.

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