Modeling of the CO 2 Absorption in a Wetted Wall Column by Piperazine Solutions

Alberto Servia (1) , Nicolas Laloue (1) , Julien Grandjean (1) , Sabine Rode (2) , Christine Roizard (2)

1 IFPEN - IFP Energies nouvelles
2 LRGP - Laboratoire Réactions et Génie des Procédés

Theoretical and experimental investigations on the reactive absorption of CO 2 in aqueous solutions of PZ using a wetted wall column are presented. A rigorous two dimensional absorption model, accounting for kinetics, hydrodynamics and thermodynamics, has been developed for a wetted wall column. Major innovative features of the model, compared to previous work, are the account on the variation of the gas-side CO 2 concentration over the reactor height as well as the computation of the gas-liquid equilibrium by a thermodynamically consistent approach. A laboratory-scale wetted wall column was conceived and constructed and the gas-side mass-transfer coefficient was estimated. CO 2 absorption experiments were carried out on unloaded and loaded aqueous solutions of PZ over the range of 298-331 K, and for total PZ concentrations varying from 0.2 to 1 M. The reactor model permitted to predict the absorption fluxes in loaded as well as in unloaded solutions with an excellent accuracy, i.e. 3.2% AAD. In loaded solutions, the gas-side CO 2 concentration gradient, as well as the dicarbamate formation reaction has to be taken into account.

Keywords: Modeling of the CO2 absorption; Piperazine; Kinetics; Hydrodynamics; Thermodynamics

Domains: Chemical Sciences; Modeling and Simulation

Alberto Servia, Nicolas Laloue, Julien Grandjean, Sabine Rode, Christine Roizard. Modeling of the CO 2 Absorption in a Wetted Wall Column by Piperazine Solutions. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, 2014, 69 (5), pp.885 - 902. ⟨10.2516/ogst/2013136⟩. ⟨hal-01085340⟩