"A Review of Polymeric Membranes for CO₂ Separation: Comparison of Permeability and Selectivity"

The escalation of CO₂ levels in the atmosphere stands as a primary environmental challenge of the 21st century. Mitigating these greenhouse effects necessitates advanced, energy-efficient separation technologies. This comprehensive review examines three prominent classes of polymeric membranes extensively studied for carbon capture: Pebax, PIM, and 6FDA-based polyimides. By evaluating their systematic transport properties, our findings indicate that Polymers of Intrinsic Microporosity (PIM-DBMP) exhibit an extraordinary permeability of up to 22,200 Barrer due to their rigid, contorted molecular backbone. Conversely, Pebax-based membranes offer an enhanced CO₂/N₂ selectivity of 50.0, demonstrating a clear trade-off between throughput and purity. This study evaluates these critical performance metrics against the Robeson upper bound to determine their industrial suitability. Ultimately, we emphasize that for large-scale industrial emissions and high-volume flue gas treatment, high-throughput permeability remains the critical operational and economic priority. Consequently, PIM membranes offer the most viable technical solution for reducing environmental impacts in large factories, consistent with recent gas separation literature.

کلیدواژه ها:

CO₂ separation ، Permeability ، Polymeric membrane ، Selectivity