Effect of spinning conditions on the structure and the gas permeation properties of high flux polyethersulfone-polyimide blend hollow fibers

G. Kapantaidakis, G.H. Koops, Matthias Wessling

Research output: Contribution to journalArticleAcademicpeer-review

41 Citations (Scopus)

Abstract

In this work, the effects of major spinning parameters, such as: polymer concentration, air gap distance, bore fluid composition, and take-up velocity on the structure and the permeation properties of polyethersulfone-polyimide gas separation hollow fibers are discussed in detail. It is shown that a spinning dope starts to exhibit significant chain entanglement at a critical polymer concentration. Fibers spun from this critical concentration exhibit theoretically the thinnest skin layer and minimum surface porosity. The longer the nascent hollow fiber membrane is exposed to a humid air-gap, the higher the water content in the top layer before demixing occurs. This results in higher surface porosity and gas permeance. Better mixing between the polymer solution and the bore liquid is achieved by adjusting the composition of the bore fluid (NMP/H20). Finally, by increasing the velocity of the take-up drum, the permeance of both CO2 and N2 decrease while their permselectivity remains constant. Suitable selection of the spinning conditions results in gas separation hollow fibers with thin skin layers (0.1 ¿m), macrovoid-free substructure, high permeation rates (CO2: 40¿60 GPU) and selectivity coefficients (a CO2/N2: 40). These results compete directly with the performance of commercial gas separation membranes.
Original languageUndefined
Pages (from-to)121-125
JournalDesalination
Volume144
Issue number1-3
DOIs
Publication statusPublished - 2002

Keywords

  • Polymer blends
  • Gas separation
  • IR-38158
  • Hollow fibers
  • METIS-209112
  • Dry/wet spinning

Cite this

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title = "Effect of spinning conditions on the structure and the gas permeation properties of high flux polyethersulfone-polyimide blend hollow fibers",
abstract = "In this work, the effects of major spinning parameters, such as: polymer concentration, air gap distance, bore fluid composition, and take-up velocity on the structure and the permeation properties of polyethersulfone-polyimide gas separation hollow fibers are discussed in detail. It is shown that a spinning dope starts to exhibit significant chain entanglement at a critical polymer concentration. Fibers spun from this critical concentration exhibit theoretically the thinnest skin layer and minimum surface porosity. The longer the nascent hollow fiber membrane is exposed to a humid air-gap, the higher the water content in the top layer before demixing occurs. This results in higher surface porosity and gas permeance. Better mixing between the polymer solution and the bore liquid is achieved by adjusting the composition of the bore fluid (NMP/H20). Finally, by increasing the velocity of the take-up drum, the permeance of both CO2 and N2 decrease while their permselectivity remains constant. Suitable selection of the spinning conditions results in gas separation hollow fibers with thin skin layers (0.1 ¿m), macrovoid-free substructure, high permeation rates (CO2: 40¿60 GPU) and selectivity coefficients (a CO2/N2: 40). These results compete directly with the performance of commercial gas separation membranes.",
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author = "G. Kapantaidakis and G.H. Koops and Matthias Wessling",
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Effect of spinning conditions on the structure and the gas permeation properties of high flux polyethersulfone-polyimide blend hollow fibers. / Kapantaidakis, G.; Koops, G.H.; Wessling, Matthias.

In: Desalination, Vol. 144, No. 1-3, 2002, p. 121-125.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effect of spinning conditions on the structure and the gas permeation properties of high flux polyethersulfone-polyimide blend hollow fibers

AU - Kapantaidakis, G.

AU - Koops, G.H.

AU - Wessling, Matthias

PY - 2002

Y1 - 2002

N2 - In this work, the effects of major spinning parameters, such as: polymer concentration, air gap distance, bore fluid composition, and take-up velocity on the structure and the permeation properties of polyethersulfone-polyimide gas separation hollow fibers are discussed in detail. It is shown that a spinning dope starts to exhibit significant chain entanglement at a critical polymer concentration. Fibers spun from this critical concentration exhibit theoretically the thinnest skin layer and minimum surface porosity. The longer the nascent hollow fiber membrane is exposed to a humid air-gap, the higher the water content in the top layer before demixing occurs. This results in higher surface porosity and gas permeance. Better mixing between the polymer solution and the bore liquid is achieved by adjusting the composition of the bore fluid (NMP/H20). Finally, by increasing the velocity of the take-up drum, the permeance of both CO2 and N2 decrease while their permselectivity remains constant. Suitable selection of the spinning conditions results in gas separation hollow fibers with thin skin layers (0.1 ¿m), macrovoid-free substructure, high permeation rates (CO2: 40¿60 GPU) and selectivity coefficients (a CO2/N2: 40). These results compete directly with the performance of commercial gas separation membranes.

AB - In this work, the effects of major spinning parameters, such as: polymer concentration, air gap distance, bore fluid composition, and take-up velocity on the structure and the permeation properties of polyethersulfone-polyimide gas separation hollow fibers are discussed in detail. It is shown that a spinning dope starts to exhibit significant chain entanglement at a critical polymer concentration. Fibers spun from this critical concentration exhibit theoretically the thinnest skin layer and minimum surface porosity. The longer the nascent hollow fiber membrane is exposed to a humid air-gap, the higher the water content in the top layer before demixing occurs. This results in higher surface porosity and gas permeance. Better mixing between the polymer solution and the bore liquid is achieved by adjusting the composition of the bore fluid (NMP/H20). Finally, by increasing the velocity of the take-up drum, the permeance of both CO2 and N2 decrease while their permselectivity remains constant. Suitable selection of the spinning conditions results in gas separation hollow fibers with thin skin layers (0.1 ¿m), macrovoid-free substructure, high permeation rates (CO2: 40¿60 GPU) and selectivity coefficients (a CO2/N2: 40). These results compete directly with the performance of commercial gas separation membranes.

KW - Polymer blends

KW - Gas separation

KW - IR-38158

KW - Hollow fibers

KW - METIS-209112

KW - Dry/wet spinning

U2 - 10.1016/S0011-9164(02)00299-0

DO - 10.1016/S0011-9164(02)00299-0

M3 - Article

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SP - 121

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JO - Desalination

JF - Desalination

SN - 0011-9164

IS - 1-3

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