Carbon membranes from blends of PBI and polyimides for N2/CH4 and CO2/CH4 separation and hydrogen purification

Preparation and characterization of Matrimid® 5218 based binary and ternary mixed matrix membranes for CO2 separation

“…For pure Matrimid, increasing the feed pressure leads to a slight decrease in CO 2 permeability. In other words, the plasticization of Matrimid was not recognized up to 10 bar which is according to the previous studies (Hosseini et al, 2007;Hosseini and Chung, 2009;Wing, 2015;Ismail and Lorna, 2002). For most of glassy polymers, the CO 2 permeability decreases with increasing the feed pressure.…”

Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part II: Effect of the carbonization temperature on the gas permeation properties

“…The gas permeation of aged membranes can be increased heating them from 100 o C to 200 o C; this enhancement was assigned to the removal of physically adsorbed water. From the gas permeation at different feed pressures and temperatures, it was possible to calculate the permeation activation energy, Ea for N2, O2, CO2, He and H2; the permeation increases as the water is removed and the Ea increases with the size of the permeant species; below 200 o C, CO2 has a higher activation energy than expected according to its size, this due to the permeation mechanism of molecular sieving and adsorption [61], (e) Mc Carthy [82], (f) Campo [52].…”

The optimal point within the Robeson upper boundary

“…It was found that a permeance of 10 -7 mol m -2 s -1 Pa -1 was needed for commercial operation. (Japip et al 2014;Yong, et al 2012;Hosseini and Chung, 2009). Although, these studies are important and will probably serve to define a future upper boundary, the objective of the present work is to demonstrate that given a boundary, all points within it are not optimal.…”