Computational simulation of CO2 removal from gas mixtures by chemical absorbents in porous membranes

In this study chemical absorption of CO2 from a N-2/CO2 gas mixture in tetramethylammonium glycinate ([N-1111][Gly]) solution using hollow-fiber membrane contactors by employing the CFD (computational fluid dynamics) method was investigated. A two dimensional mathematical model was developed to describe diffusion in axial and radial directions of the HFMC (hollow-fiber membrane contactor). Also, the model gives an account of convection in the tube and the shell sides with chemical reaction between CO2 and the absorbent. Results of simulation showed good agreement with experimental data which reveals the validity of the model. CO2 absorption from the gas mixture increases as the flow rate and the concentration of the absorbent goes up. On the other hand, increase of gas flow rate decreases removal of CO2. The proposed model can predict CO2 capture from gas mixtures in HFMCs.