Plasticization-Enhanced Hydrogen Purification Using Polymeric Membranes

Lin, Haiqing; Wagner, Elizabeth Van; Freeman, Benny D.; Toy, Lora; Gupta, Raghubir

doi:10.1126/science.1118079

Cited by 618 publications

(358 citation statements)

References 27 publications

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“…Moreover, the results revealed that the membranes retained their favorable properties even when additional compounds e.g. H 2 S and moisture were present [59]. Such findings are highly valuable since beside the main of the gas mixture constituents (H 2 , CO 2 , N 2 ) evolved during biohydrogen fermentation, certain trace compounds (e.g.…”

Section: 2mentioning

confidence: 90%

Biohydrogen purification by membranes: An overview on the operational conditions affecting the performance of non-porous, polymeric and ionic liquid based gas separation membranes

Bakonyi

Nemestóthy

Bélafi–Bakó

2013

International Journal of Hydrogen Energy

145

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Membrane Separation Polymer Ionic liquidIntegrated system a b s t r a c t Many types of membranes are available to enrich hydrogen. Nevertheless, there are some with special potential for biohydrogen purification such as the non-porous, polymeric and ionic liquid based membranes. The attractiveness of these membranes comes from the fact that they can be employed nearly under the conditions where biohydrogen formation taking place. Therefore, they appear as promising candidates to be coupled with hydrogen producing bioreactors and hence giving the chance for in situ biohydrogen concentration.It is known that the feasibility and efficiency of membrane technology e beside material selection and module design e significantly depend on the separation circumstances.Thus, the operation of membranes is a key issue and the most important factors to be considered for gas purification are the composition of gas to be separated, the pressure and temperature applied. The scope of this study is to give a comprehensive overview on the recent applications of non-porous, polymeric and ionic liquid supported membranes for biohydrogen recovery, placing emphasis on the operational conditions affecting membrane's behavior and performance. Furthermore, a novel concept for integrated biohydrogen production and purification using gas separation membranes is demonstrated and discussed.

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Section: 2mentioning

confidence: 90%

Biohydrogen purification by membranes: An overview on the operational conditions affecting the performance of non-porous, polymeric and ionic liquid based gas separation membranes

Bakonyi

Nemestóthy

Bélafi–Bakó

2013

International Journal of Hydrogen Energy

145

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“…Ultraviolet light irradiation is a widely used technique for processing of polymer materials 8,[37][38][39][40] , for example, polymerization of novel gas-separation membranes 40 , creating nanostructures from block copolymer 8 , or surface modification of polymeric films (for example, polyimides and polydimethylsiloxane) 8,[37][38][39] . Enhancement of membrane-separation properties by ultraviolet surface modification is not uncommon.…”

mentioning

confidence: 99%

Photo-oxidative enhancement of polymeric molecular sieve membranes

et al. 2013

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High-performance membranes are attractive for molecular-level separations in industrialscale chemical, energy and environmental processes. The next-generation membranes for these processes are based on molecular sieving materials to simultaneously achieve high throughput and selectivity. Membranes made from polymeric molecular sieves such as polymers of intrinsic microporosity (pore sizeo2 nm) are especially interesting in being solution processable and highly permeable but currently have modest selectivity. Here we report photo-oxidative surface modification of membranes made of a polymer of intrinsic microporosity. The ultraviolet light field, localized to a near-surface domain, induces reactive ozone that collapses the microporous polymer framework. The rapid, near-surface densification results in asymmetric membranes with a superior selectivity in gas separation while maintaining an apparent permeability that is two orders of magnitude greater than commercially available polymeric membranes. The oxidative chain scission induced by ultraviolet irradiation also indicates the potential application of the polymer in photolithography technology.

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“…Hence PEG is considered an attractive material for separation of CO 2 from other gases. Moreover cross-linked PEGDa dense films do not show a pronounced selectivity loss due to plasticization, since the selectivity is based on solubility rather than on mobility [13].…”

Section: Introductionmentioning

confidence: 99%

“…Commercially important glassy polymeric membranes should be improved in terms of selectivity to compete with conventional processes, particularly in view of selectivity losses with mixed gases. Poly (ethylene glycol) (PEG) based polymers exhibit good CO 2 /N 2 selectivity (˛≥ 50), because of the higher solubility of CO 2 in polar PEG [12][13][14][15][16]. Hence PEG is considered an attractive material for separation of CO 2 from other gases.…”

Section: Introductionmentioning

confidence: 99%