Volume 42, Issue 3 pp. 645-654
Research Article

Enhancing the CO2 Separation Performance of Matrimid 5218 Membranes for CO2/CH4 Binary Mixtures

Roberto Castro-Muñoz

Corresponding Author

Roberto Castro-Muñoz

University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic

Correspondence: Roberto Castro-Muñoz ([email protected]), University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.Search for more papers by this author
Vlastimil Fíla

Vlastimil Fíla

University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic

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Mohd Zamidi Ahmad

Mohd Zamidi Ahmad

University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic

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First published: 08 January 2019
Citations: 34

Abstract

The effect of CO2-philic additive polyethylene glycol (PEG) 200 in Matrimid 5218 on the separation performance of prepared membranes was evaluated in a binary gas mixture. Matrimid/PEG 200 flat-sheet blended membranes with low PEG concentrations were prepared by the dense film-casting method. Pure Matrimid and blended membranes were characterized by FTIR spectroscopy, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and permeation measurements. The addition of 4–5 % of PEG enhanced considerably the CO2 permeability of the Matrimid matrix. The best formulation, Matrimid/PEG 200 (96/4), showed in comparison to pure Matrimid a more than threefold increase in CO2 permeability and an increase in separation factor of about 40 %.

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