Vapor and Gas Separation by Membranes

Baker, Richard W.

doi:10.1002/9780470276280.ch21

Cited by 33 publications

(41 citation statements)

References 12 publications

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“…In addition, if the permeate water vapor pressure cycles above and below the dew point, then capillary pressure caused by evaporating and reforming water droplets can collapse micro-voids and pores within the membrane and support layer, which is detrimental to membrane performance. Hence, for many membrane applications pretreatment processing to remove the majority of the water present is required [7]. As such, membranes that are resistant to the impact of water are of particular interest because of the potential to reduce pretreatment processing and to handle wet feed gas.…”

Section: Introductionmentioning

confidence: 99%

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Scholes

Kanehashi

Stevens

et al. 2015

Separation and Purification Technology

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The permeability of water through polymeric membranes is of particular interest in gas separation, because of the high water vapor content found in many industrial applications. Polymeric membranes that are resistant to competitive sorption and plasticization by water are especially attractive, since they can reduce the need for gas pretreatment in many membrane applications. The perfluorinated polymers Teflon AF1600 and Hyflon AD60 are studied here for this purpose because of their strong hydrophobicity and unusual solvent properties. It was observed that water permeability through both perfluorinated polymers was of the same magnitude as CO 2 . Indeed, under the conditions studied, Teflon AF1600 was selective for CO 2 over water. Such reverse selectivity for the CO 2 -H 2 O gas pair has not been reported before for glassy polymeric membranes and reflects the very low solubility of water in the polymer. The water permeability through Hyflon AD60 was greater than that for CO 2 with a minimum at 55 o C. The change in both CO 2 and CH 4 permeability through Teflon AF1600 and Hyflon AD60 was investigated as a function of water activity in the feed gas to investigate the effects of competitive permeation. It was observed that CO 2 and CH 4 permeability in both membranes reduced with water activity. For both Teflon AF1600 and Hyflon AD60, the decrease in permeability of both gases with water activity was interpreted as water clusters blocking the diffusion of both CO 2 and CH 4 through the membrane.

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Section: Introductionmentioning

confidence: 99%

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Scholes

Kanehashi

Stevens

et al. 2015

Separation and Purification Technology

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“…This was because of the fluctuating humidity of the feed flue gas; and fluctuating gas temperatures in the un‐insulated small bore feed supply piping with ambient temperature fluctuations. Such water condensation is often avoided in other membrane gas separation processes, such as natural gas processing, by having an extensive dehydration process upstream …”

Section: Methodsmentioning

confidence: 88%

Membrane pilot plant trials of CO₂ separation from flue gas

et al. 2015

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Industrial trials of membrane separation of CO2 from flue gas generated by a lignite‐fired power station are reported. A hollow fiber Air Products PRISM and a spiral wound Dow Filmtec® NF3838/30FF membrane were separately trialed. The CO2 permeance and selectivity through the PRISM membrane fell significantly in the initial hours of operation, reflecting competitive sorption effects and concentration polarisation. Alternatively, the wet flue gas enabled a facilitated transport mechanism to operate for the NF3838/30FF membrane and the CO2 permeance and selectivity increased significantly compared to the dry membrane. Standard correlations were able to simulate the pressure drops through the modules.© 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…GS systems equipped with polymeric membrane modules are widely commercially available. They can be applied to the recovery of the unreacted ethylene from the reactor purge (Baker 2008). Taking into account that ethylene represents about 70% of the total cost of EO manufacture, the reduction of ethylene loss is a fundamental issue to enhance the efficiency of the process.…”

Section: Gas Separation (Gs)mentioning

confidence: 99%

Integrated membrane operations in the ethylene oxide production

Bernardo

Clarizia

2011

Clean Techn Environ Policy

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Petrochemical industry, highly energy and capital intensive, might significantly benefit from the implementation of membrane operations for meeting stringent environmental standards, controlling production cost and final product's quality. Membrane units have been proved effective for improving the efficiency of different industrial productions. Ethylene oxide (EO), an important petrochemical intermediate, is produced by selective catalytic oxidation of ethylene, a valuable hydrocarbon feedstock. In this study, the EO manufacturing cycle is redesigned by integrating different membrane operations. Both the conversion and separation sections of the plant are investigated, considering the use of membrane reactors (MRs) for the separate feeding of the oxidant, membrane contactors (MCs) for the absorption of EO and carbon dioxide, and gas separation (GS) membrane units for the hydrocarbon recovery before their being recycled to the reactor. Design considerations are provided, and the benefits coming from each membrane operation, as well as from their synergic integration, are outlined with particular attention to environmental impact, raw materials and energy consumption.

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Vapor and Gas Separation by Membranes

Cited by 33 publications

References 12 publications

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Membrane pilot plant trials of CO₂ separation from flue gas

Integrated membrane operations in the ethylene oxide production

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Vapor and Gas Separation by Membranes

Cited by 33 publications

References 12 publications

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Water permeability and competitive permeation with CO 2 and CH 4 in perfluorinated polymeric membranes

Membrane pilot plant trials of CO2 separation from flue gas

Integrated membrane operations in the ethylene oxide production

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Product

Resources

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Membrane pilot plant trials of CO₂ separation from flue gas