PEG modified poly(amide-b-ethylene oxide) membranes for CO2 separation

Anja Car; Chrtomir Stropnik; Wilfredo Yave; Klaus-Victor Georg Peinemann

doi:10.1016/j.memsci.2007.09.023

PEG modified poly(amide-b-ethylene oxide) membranes for CO₂ separation

Anja Car, Chrtomir Stropnik, Wilfredo Yave, Klaus-Victor Georg Peinemann^*

^*Corresponding author for this work

Chemical Engineering

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

420 Scopus citations

Abstract

In the present work, membranes from commercially available Pebax^® MH 1657 and its blends with low molecular weight poly(ethylene glycol) PEG were prepared by using a simple binary solvent (ethanol/water). Dense film membranes show excellent compatibility with PEG system up to 50 wt.% of content. Gas transport properties have been determined for four gases (H₂, N₂, CH₄, CO₂) and the obtained permeabilities were correlated with polymer properties and morphology of the membranes. The permeability of CO₂ in Pebax^®/PEG membrane (50 wt.% of PEG) was increased two fold regarding to the pristine Pebax^®. Although CO₂/N₂ and CO₂/CH₄ selectivity remained constant, an enhancement of CO₂/H₂ selectivity (∼11) was observed. These results were attributed to the presence of EO units which increases CO₂ permeability, and to a probable increase of fractional free-volume. Furthermore, for free-volume discussion and permeability of gases, additive and Maxwell models were used.

Original language	English (US)
Pages (from-to)	88-95
Number of pages	8
Journal	Journal of Membrane Science
Volume	307
Issue number	1
DOIs	https://doi.org/10.1016/j.memsci.2007.09.023
State	Published - Jan 10 2008

Keywords

Blend membranes
Carbon dioxide
Gas separation
Pebax

ASJC Scopus subject areas

Biochemistry
General Materials Science
Physical and Theoretical Chemistry
Filtration and Separation

Access to Document

10.1016/j.memsci.2007.09.023

Cite this

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title = "PEG modified poly(amide-b-ethylene oxide) membranes for CO2 separation",

abstract = "In the present work, membranes from commercially available Pebax{\textregistered} MH 1657 and its blends with low molecular weight poly(ethylene glycol) PEG were prepared by using a simple binary solvent (ethanol/water). Dense film membranes show excellent compatibility with PEG system up to 50 wt.% of content. Gas transport properties have been determined for four gases (H2, N2, CH4, CO2) and the obtained permeabilities were correlated with polymer properties and morphology of the membranes. The permeability of CO2 in Pebax{\textregistered}/PEG membrane (50 wt.% of PEG) was increased two fold regarding to the pristine Pebax{\textregistered}. Although CO2/N2 and CO2/CH4 selectivity remained constant, an enhancement of CO2/H2 selectivity (∼11) was observed. These results were attributed to the presence of EO units which increases CO2 permeability, and to a probable increase of fractional free-volume. Furthermore, for free-volume discussion and permeability of gases, additive and Maxwell models were used.",

keywords = "Blend membranes, Carbon dioxide, Gas separation, Pebax",

author = "Anja Car and Chrtomir Stropnik and Wilfredo Yave and Peinemann, {Klaus-Victor Georg}",

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T1 - PEG modified poly(amide-b-ethylene oxide) membranes for CO2 separation

AU - Car, Anja

AU - Stropnik, Chrtomir

AU - Yave, Wilfredo

AU - Peinemann, Klaus-Victor Georg

PY - 2008/1/10

Y1 - 2008/1/10

N2 - In the present work, membranes from commercially available Pebax® MH 1657 and its blends with low molecular weight poly(ethylene glycol) PEG were prepared by using a simple binary solvent (ethanol/water). Dense film membranes show excellent compatibility with PEG system up to 50 wt.% of content. Gas transport properties have been determined for four gases (H2, N2, CH4, CO2) and the obtained permeabilities were correlated with polymer properties and morphology of the membranes. The permeability of CO2 in Pebax®/PEG membrane (50 wt.% of PEG) was increased two fold regarding to the pristine Pebax®. Although CO2/N2 and CO2/CH4 selectivity remained constant, an enhancement of CO2/H2 selectivity (∼11) was observed. These results were attributed to the presence of EO units which increases CO2 permeability, and to a probable increase of fractional free-volume. Furthermore, for free-volume discussion and permeability of gases, additive and Maxwell models were used.

AB - In the present work, membranes from commercially available Pebax® MH 1657 and its blends with low molecular weight poly(ethylene glycol) PEG were prepared by using a simple binary solvent (ethanol/water). Dense film membranes show excellent compatibility with PEG system up to 50 wt.% of content. Gas transport properties have been determined for four gases (H2, N2, CH4, CO2) and the obtained permeabilities were correlated with polymer properties and morphology of the membranes. The permeability of CO2 in Pebax®/PEG membrane (50 wt.% of PEG) was increased two fold regarding to the pristine Pebax®. Although CO2/N2 and CO2/CH4 selectivity remained constant, an enhancement of CO2/H2 selectivity (∼11) was observed. These results were attributed to the presence of EO units which increases CO2 permeability, and to a probable increase of fractional free-volume. Furthermore, for free-volume discussion and permeability of gases, additive and Maxwell models were used.

KW - Blend membranes

KW - Carbon dioxide

KW - Gas separation

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