Exergetic simulation study of CO₂ separation by cryogenic distillation
by Y. Nandakishora; Ranjit K. Sahoo; S. Murugan; Sai Gu
International Journal of Exergy (IJEX), Vol. 41, No. 3, 2023

Abstract: A cryogenic process for CO₂ separation is developed, with exergy minimisation using Aspen Plus software. The RadFrac distillation model is used for the separation of CO₂ from a CO₂/N₂ gas mixture. The process is modified to minimise the energy penalty of CO₂ separation. The comparative study is focused on energy savings, exergy losses, and economic and environmental factors. The energy penalty of the optimised process is approximately 1.049 MJ/kg-CO₂ with purity and recovery of 99.9% and 98%, respectively. The exergy loss in the optimised process is approximately 14% lower than in the basic design.

Online publication date: Tue, 04-Jul-2023

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