Membranes for Heat Integrated CO2 Capture Via Sub-Ambient Temperature Operation | AIChE

Membranes for Heat Integrated CO2 Capture Via Sub-Ambient Temperature Operation


Conference Presentation

Conference Type

AIChE Annual Meeting

Presentation Date

November 4, 2013


15 minutes

Skill Level




Pulverized coal (PC) power plants emit CO2 in flue gas at atmospheric pressure with a volume concentration of 10-15%. Post-combustion capture of CO2 is a challenging application but has the greatest near-term potential , because it can be retrofitted to existing state-of-the-art power plants. Membrane-based separation is a promising technology for post-combustion CO2 capture. Our study explored sub-ambient temperature conditions for CO2/N2 separation with Matrimid® asymmetric hollow fiber membranes. Due to the lower permeation activation energy for CO2 , a decrease in operating temperature reduced N2 permeance more than CO2 , resulting in high CO2/N2 selectivity. We found that skin morphology had great influence on hollow fiber membrane’s separation performance. Fibers with two kinds of skins were successfully spun: fused nodular skins and isotropic dense skins. At -50 °C , the nodular-skinned hollow fiber membranes displayed CO2/N2 selectivity higher than 150 with CO2 permeance higher than 100 GPU. However , the CO2/N2 selectivity and CO2 permeance for dense-skinned samples were much lower. This was hypothesized to be the synergistic effect of increased diffusivity selectivity and solubility selectivity in nodular-skinned hollow fiber membranes at sub-ambient temperatures.


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