Composite hollow fiber membranes for gas separation: the resistance model approach

ABSTRACT:Composite membranes containing a thin-film layer of aromatic polyimides (PI) ensure an advantageous combination of selectivity and permeability in gas separation. A series of rigid-chain PI with different chemical structures were studied as a thin active layer. Composite membranes were prepared by coating a solution of poly-(amic acid) (PAA) and an imidization catalyst on a poly(phenylene oxide) (PPO) support with pores filled by decane. The subsequent stage of solid-state catalytic transformation of the PAA/PPO membrane into the PI/PPO membrane determines the specific structure of the PI layer and the transport properties of the PI/PPO composite membranes. The structure of composite membranes was determined by scanning electron microscopy and analyzed in the terms of the resistance model of gas transport in composite membranes.

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“…12 By definition, membrane resistance R (s cm Hg/cm 3 ) is inversely proportional to gas flux Q (cm 3 /s) through a composite membrane:…”

Section: Resultsmentioning

confidence: 99%

Formation and analysis of a polyimide layer in composite membranes

Polotskaya

Sklizkova

Kozhurnikova

et al. 2000

J. Appl. Polym. Sci.

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“…However, a thin coating of a highly permeable polymer, such as polydimethylsiloxane, can render defective membranes suitable for gas separations. Modification methods developed by Browall for thin-film composite membranes (71) and, in particular, Henis and Tripodi for integrally-skinned asymmetric membranes (72,73) resulted in rapid commercialization of gas separation membranes. Surface coatings are also applicable in improving the fouling resistance of membranes for ultrafiltration or nanofiltration applications (74)(75)(76).…”

Section: Membrane Modification Methodsmentioning

confidence: 99%

Formation and Modification of Polymeric Membranes: Overview

Pinnau

Freeman

1999

ACS Symposium Series

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“…Sulfur concentration increases with probing depth and reaches 3.2 at %, the value typical for PSf. The PTMSP selective layer thickness can be defined by the inflection point of the concentration-probing depth To estimate the contribution of the PTMSP selective layer, PTMSP layer in the support pores and of the support itself in the cumulative permeance value, the calculation was performed based on Henis and Tripodi [31] model:…”

Section: Composite Membranes Fabricationmentioning

confidence: 99%

Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching

Borisov

Ovcharova

Bakhtin

et al. 2017

Fibers

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For the development of high efficiency porous supports for composite membrane preparation, polysulfone (PSf) hollow fiber membranes (outer diameter 1.57 mm, inner diameter 1.12 mm) were modified by air plasma using the low temperature plasma treatment pilot plant which is easily scalable to industrial level and the Piranha etch (H 2 O 2 + H 2 SO 4 ). Chemical and plasma modification affected only surface layers and did not cause PSf chemical structure change. The modifications led to surface roughness decrease, which is of great importance for further thin film composite (TFC) membranes fabrication by dense selective layer coating, and also reduced water and ethylene glycol contact angle values for modified hollow fibers surface. Furthermore, the membranes surface energy increased two-fold. The Piranha mixture chemical modification did not change the membranes average pore size and gas permeance values, while air plasma treatment increased pore size 1.5-fold and also 2 order enhanced membranes surface porosity. Since membranes surface porosity increased due to air plasma treatment the modified membranes were used as efficient supports for preparation of high permeance TFC membranes by using poly[1-(trimethylsilyl)-1-propyne] as an example for selective layer fabrication.

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Composite hollow fiber membranes for gas separation: the resistance model approach

Cited by 517 publications

References 6 publications

Formation and analysis of a polyimide layer in composite membranes

Formation and analysis of a polyimide layer in composite membranes

Formation and Modification of Polymeric Membranes: Overview

Development of Polysulfone Hollow Fiber Porous Supports for High Flux Composite Membranes: Air Plasma and Piranha Etching

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