Poly(ethylene oxide) induced cross-linking modification of Matrimid membranes for selective separation of CO2

Polymeric membranes for the hydrogen economy: Contemporary approaches and prospects for the future

“…The good CO 2 /H 2 separation performance of Pebax ® /PEG composite membranes under mixed-gas tests suggests the possibility of future commercialization. In another work by Zhao et al, amino-terminated PEG was applied to modify Matrimid ® membranes by means of a chemical reaction between the amine and imide groups [113]. A significant increment in CO 2 permeability was obtained while the corresponding H 2 permeability decreased slightly after modifying the Matrimid ® membranes with amino-PEG.…”

Membrane technology for carbon dioxide (CO 2 ) capture in power plants

“…A CO 2 /H 2 selectivity of 11 and CO 2 permeability of 150 Barrer have been estimated for polyether-b-polyamide segmented block copolymers, whereas an increase in CO 2 permeability and selectivity for the CO 2 -H 2 gas-pair has been measured for PEO-PBT (500PEO77PBT23) at 30 wt% of PEG (Yave and Peinemann 2010). The addition of a physical solvent for acid gas absorption such as PEG-dimethylether (PEG-DME) to the polyether-b-polyamide copolymer resulted in an eight-fold increase in the carbon dioxide permeability and CO 2 /H 2 -selectivity increased simultaneously from 9.1 to 14.9 (Car et al, 2008b;Zhao et al, 2008b). Indeed, PEG affi nity to quadrupolar gas is large enough to change the selectivity mechanism in Matrimid® membranes, moving from H 2 -selective membranes to reverse H 2 -selective membranes with CO 2 /H 2 7.3 (Simmons, 2005;Zhao et al, 2008b).…”

“…The addition of a physical solvent for acid gas absorption such as PEG-dimethylether (PEG-DME) to the polyether-b-polyamide copolymer resulted in an eight-fold increase in the carbon dioxide permeability and CO 2 /H 2 -selectivity increased simultaneously from 9.1 to 14.9 (Car et al, 2008b;Zhao et al, 2008b). Indeed, PEG affi nity to quadrupolar gas is large enough to change the selectivity mechanism in Matrimid® membranes, moving from H 2 -selective membranes to reverse H 2 -selective membranes with CO 2 /H 2 7.3 (Simmons, 2005;Zhao et al, 2008b). Poly(etherurethane) and poly(etherurea) block copolymers containing PEG (P CO 2 590 Barrer), exhibited a CO 2 /H 2 selectivity of 7.7 (Lie et al, 2007), confi rming once more the strategic role of PEO and PEG in favour of a solubility discrimination-based transport.…”

Optimization of solvent resistant nanofiltration membranes prepared by the in-situ diamine crosslinking method

“…The diamine crosslinking reaction for PI-membranes has been thoroughly studied in literature, using aliphatic [4,6,[13][14][15][16] and aromatic [2,6,10,[17][18][19] diamines or polyamines [3,[20][21][22]. The generally accepted reaction mechanism involves the introduction of diamines to the polymer backbone, forming amide groups and establishing intramolecular bonds [6].…”

“…One possibility to avoid the use of methanol, is to add the diamine to the polymer casting solution. This method has been studied by Zhao et al [21,22], Shao et al [15] and Nistor et al [24] but it can only be used in very dilute polymer solutions to avoid solidification of the casting solution prior to the membrane formation. As such, this method is limited to the preparation of very thin films of crosslinked PI, usually on top of a support layer and cannot be used to prepare phase inversion membranes.…”