Selective separation of CO2 by using novel facilitated transport membrane at elevated temperatures and pressures

Composite hollow fiber membranes for CO2 capture

“…However, the simulations are extrapolating the performance of a membrane measured under certain conditions to a variety of other conditions not tested in the lab: different sweep flow rates, higher pressure ratios, thinner membranes (higher permeance), etc. Selectivity values for CO 2 /N 2 between 100 and 1800 are reported for FSC membranes [8,9,13,[17][18][19]. When the minimum selectivity for the system has been achieved (as documented by simulations), the permeate CO 2 purity depends mostly on the membrane's ability to sustain a high pressure ratios.…”

“…The papers reporting on different FSC membranes [6][7][8][9][11][12][13][14][15][16][17][18][19] are focusing almost exclusively on the material properties of the selective layer, on the importance of water inside of the selective film for the CO 2 facilitation transport, on crosslinking procedures to enhance the mechanical stability and on the presence or absence of facilitation effect. None or very few papers correlate the preparation of the composite FSC membranes with their separation performances and mechanical stability under different operation modes (sweep or vacuum) [20].…”

“…The review by Koros and Mahajan [5] also points out an important issue regarding the applicability of FSC membranes in industry: they predict a relative low stability by comparison to the glassy, dense solution-diffusion based membranes. The point of the authors is sustained by the characteristics of the FSC membranes reported in literature: selective layer with a thickness from 20 to 500 m, thicker even than the support used as backing, maximum operating feed pressure of 5 bar and driving force created by using sweep on permeate side [8,9,13,[17][18][19]. The large thickness of the selective layer, low pressure ratio over membranes and sweep operating mode allowed preparation of these FSC membranes on micro-porous supports with 0.1-0.4 m pore size without apparently affecting the membrane performances.…”

【Original Contribution】 Effect of Ionic Liquid Additives on CO2Permeation and CO2/N2Selectivity through Facilitated Transport Membranes

“…As temperature increases, the reaction rate between glycine and CO 2 increases 16) and enhances the CO 2 permeance. Conversely, the CO 2 absorption amount would decrease with an increase in temperature 8) . In addition, as shown in Fig.…”

“…The specific performances of the FTMs have been widely investigated and it was empirically determined that the CO2 permeability and selectivity of FTMs under humid conditions were quite high 4,6,8,9,11,12) . Especially, the CO2 permeabilities of the FTMs containing amino acid as the CO2 carrier were strongly affected by humidity in the gas stream 6,8) . Therefore, it is expected that the CO2 per- To improve the CO 2 permeability of facilitated transport membranes, we investigated the effect of ionic liquid additives into the membrane.…”