Recent advances on the modeling and optimization of CO2 capture processes

Covalent organic frameworks for CO2 capture: from laboratory curiosity to industry implementation

“…Chatziasteriou et al have elucidated the simulation and optimization tools for membrane processes. 16 Preliminary simulation studies for CO 2 capture using membranes were reported by Sluijis et al , 339 in which 68% purity and 79% recovery for CO 2 separation were observed in a single-stage operation. Brunetti et al and Khalilpour et al reported that it is impossible to achieve DOE targets for CO 2 separation by a single-stage process using realistic values of membrane selectivity.…”

“…15 However, the key issues faced in the absorption process are (i) high energy for regeneration, (ii) the corrosive nature of solvents, (iii) the sensitivity of solvents to other components in the flue gas (e.g., SO x and NO x ), and (iv) degradation of solvents, leading to a reduction in separation efficiencies and increment in costs of power supply. 12,16 Though many strategies have been reported to reduce the energy requirements in the absorption process, they still involve complex integration with the plants. Furthermore, amine-based solvents typically used in absorption processes tend to form aerosols and nitrosamines, which are highly carcinogenic.…”

“…Furthermore, amine-based solvents typically used in absorption processes tend to form aerosols and nitrosamines, which are highly carcinogenic. 4,16 Recently, ionic liquids (ILs) have been reported as potential alternatives due to their unique features. However, their low capacity and high viscosity render difficulties in the long run for practical purposes.…”

Understanding the performance of membrane for direct air capture of CO2

“…25 Absorption was identified as the most mature technology, while adsorption and membrane-based separations required more development for efficient CO 2 capture. 26 Other researchers emphasized the need to improve the gas selectivity of separation nanomembranes without reducing CO 2 permeance. These membranes could be combined with CO 2 conversion systems to produce value-added carbon compounds.…”

“…These membranes could be combined with CO 2 conversion systems to produce value-added carbon compounds. 27 Traditional methods such as alkaline or amine-based solvent absorption methods 28,29 and solid sorbent technology 26,[29][30][31][32][33][34][35][36] have limitations when it comes to separating ultra-low concentrations of CO 2 , which are typically found in ambient air at around 400 ppm. By optimizing these factors, membranes can be designed with high selectivity to specific gases, such as CO 2 , for applications such as direct air capture (DAC) technology.…”