Solid formation in piperazine rate-based simulation

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Piperazine is a promising solvent for reducing CO2 emissions. It can be applied for the post-combustion capture process and it has limited degradation and fast kinetics. However, precipitation and slurry formation still represent a challenge for the PZ-CO2-H2O system from an operational point of view but also from a modeling perspective. The present work develops a rate-based model for CO2 absorption and desorption modeling for gas-liquid-solid systems and it is demonstrated for the piperazine CO2 capture process. This model is an extension of the DTU CAPCO2 model to precipitating systems. It uses the extended UNIQUAC thermodynamic model for phase equilibria and thermal properties estimation. The mass and heat transfer phenomena is implemented in a film model approach, based on second order reactions kinetics. The transfer fluxes are calculated using the concentration of the dissolved species since the piperazine is deactivated when present as solid. It is assumed that solid-gas reactions are slow compared to normal liquid side reactions. In the current work, the formation of solids is described in an equilibrium approach, assuming instantaneous formation of hydrates such as PZ·6H2O, PZ·½H2O, and anhydrous PZ. The simulation of a 100t/hr post-combustion capture plant outlines that 5 % solid reduces the CO2 capture rate with 13%. Therefore, it demonstrates that an accurate description of the precipitation phenomenon is essential for realistic and accurate modeling.
Original languageEnglish
JournalEnergy Procedia
Pages (from-to)1074-1083
Publication statusPublished - 2014
Event12th International Conference on Greenhouse Gas Technologies (GHGT-12) - University of Texas at Austin, Austin, TX, United States
Duration: 5 Oct 20149 Oct 2014
Conference number: 12


Conference12th International Conference on Greenhouse Gas Technologies (GHGT-12)
LocationUniversity of Texas at Austin
CountryUnited States
CityAustin, TX
Internet address

Bibliographical note

© 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license


  • CO2 post-combustion capture simulation and optimization
  • Aquoeus ammonia
  • Slurry and solid formation
  • Low energy process
  • Extended uniquac

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