Development of asymmetric hollow fibers from polyimides for air separation

Tai Shung Chung; E. Ronald Kafchinski; Paul Foley

doi:10.1016/0376-7388(92)80016-D

Development of asymmetric hollow fibers from polyimides for air separation

Tai Shung Chung^*, E. Ronald Kafchinski, Paul Foley

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

90 Scopus citations

Abstract

We have developed 6FDA/6FDAM polyimide hollow fibers with a selectivity of 6.7 for O₂/N₂ and a permeance of 8.3×10^-6 cc(STP)/cm²-sec-cmHg. The dense layer thickness was about 1000-1900 Å. These hollow fibers were dry-jet wet-spun from a 42% low IV (intrinsic viscosity)6FDA/6FDAM polyimide/N-methyl-pyrrolidone (NMP)/propionic acid (PA) (57/43) dope using methanol as a coagulant and 80/20 NMP/H₂O as a bore fluid. The hollow fiber must be coated with a silicone elastomer. The fiber diameter was about 215 μm with a wall thickness about 25-30 μm. SEM observation showed that the dense layer was located at the outer surface, while the region near the inner surface had an interconnceted open-cell structure. The total void percentage in this fiber was about 60%. The calculated Hildebrand parameter for this study was about 2.3 to 2.99 (cal/cm³)^0.5 between the NMP:PA solvent complex and the polyimide. The first T_g for our 6FDA/6FDAM polyimide hollow fiber was much lower than the T_g of its bulk, or second T_g.

Original language	English (US)
Pages (from-to)	181-195
Number of pages	15
Journal	Journal of Membrane Science
Volume	75
Issue number	1-2
DOIs	https://doi.org/10.1016/0376-7388(92)80016-D
State	Published - Dec 16 1992
Externally published	Yes

Keywords

air separation
asymmetric membranes
hollow fiber membranes

ASJC Scopus subject areas

Biochemistry
General Materials Science
Physical and Theoretical Chemistry
Filtration and Separation

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10.1016/0376-7388(92)80016-D

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title = "Development of asymmetric hollow fibers from polyimides for air separation",

abstract = "We have developed 6FDA/6FDAM polyimide hollow fibers with a selectivity of 6.7 for O2/N2 and a permeance of 8.3×10-6 cc(STP)/cm2-sec-cmHg. The dense layer thickness was about 1000-1900 {\AA}. These hollow fibers were dry-jet wet-spun from a 42% low IV (intrinsic viscosity)6FDA/6FDAM polyimide/N-methyl-pyrrolidone (NMP)/propionic acid (PA) (57/43) dope using methanol as a coagulant and 80/20 NMP/H2O as a bore fluid. The hollow fiber must be coated with a silicone elastomer. The fiber diameter was about 215 μm with a wall thickness about 25-30 μm. SEM observation showed that the dense layer was located at the outer surface, while the region near the inner surface had an interconnceted open-cell structure. The total void percentage in this fiber was about 60%. The calculated Hildebrand parameter for this study was about 2.3 to 2.99 (cal/cm3)0.5 between the NMP:PA solvent complex and the polyimide. The first Tg for our 6FDA/6FDAM polyimide hollow fiber was much lower than the Tg of its bulk, or second Tg.",

keywords = "air separation, asymmetric membranes, hollow fiber membranes",

author = "Chung, {Tai Shung} and Kafchinski, {E. Ronald} and Paul Foley",

year = "1992",

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doi = "10.1016/0376-7388(92)80016-D",

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T1 - Development of asymmetric hollow fibers from polyimides for air separation

AU - Chung, Tai Shung

AU - Kafchinski, E. Ronald

AU - Foley, Paul

PY - 1992/12/16

Y1 - 1992/12/16

N2 - We have developed 6FDA/6FDAM polyimide hollow fibers with a selectivity of 6.7 for O2/N2 and a permeance of 8.3×10-6 cc(STP)/cm2-sec-cmHg. The dense layer thickness was about 1000-1900 Å. These hollow fibers were dry-jet wet-spun from a 42% low IV (intrinsic viscosity)6FDA/6FDAM polyimide/N-methyl-pyrrolidone (NMP)/propionic acid (PA) (57/43) dope using methanol as a coagulant and 80/20 NMP/H2O as a bore fluid. The hollow fiber must be coated with a silicone elastomer. The fiber diameter was about 215 μm with a wall thickness about 25-30 μm. SEM observation showed that the dense layer was located at the outer surface, while the region near the inner surface had an interconnceted open-cell structure. The total void percentage in this fiber was about 60%. The calculated Hildebrand parameter for this study was about 2.3 to 2.99 (cal/cm3)0.5 between the NMP:PA solvent complex and the polyimide. The first Tg for our 6FDA/6FDAM polyimide hollow fiber was much lower than the Tg of its bulk, or second Tg.

AB - We have developed 6FDA/6FDAM polyimide hollow fibers with a selectivity of 6.7 for O2/N2 and a permeance of 8.3×10-6 cc(STP)/cm2-sec-cmHg. The dense layer thickness was about 1000-1900 Å. These hollow fibers were dry-jet wet-spun from a 42% low IV (intrinsic viscosity)6FDA/6FDAM polyimide/N-methyl-pyrrolidone (NMP)/propionic acid (PA) (57/43) dope using methanol as a coagulant and 80/20 NMP/H2O as a bore fluid. The hollow fiber must be coated with a silicone elastomer. The fiber diameter was about 215 μm with a wall thickness about 25-30 μm. SEM observation showed that the dense layer was located at the outer surface, while the region near the inner surface had an interconnceted open-cell structure. The total void percentage in this fiber was about 60%. The calculated Hildebrand parameter for this study was about 2.3 to 2.99 (cal/cm3)0.5 between the NMP:PA solvent complex and the polyimide. The first Tg for our 6FDA/6FDAM polyimide hollow fiber was much lower than the Tg of its bulk, or second Tg.

KW - air separation

KW - asymmetric membranes

KW - hollow fiber membranes

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DO - 10.1016/0376-7388(92)80016-D

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JO - Journal of Membrane Science

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IS - 1-2

ER -

Development of asymmetric hollow fibers from polyimides for air separation

Abstract

Keywords

ASJC Scopus subject areas

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