화학공학소재연구정보센터
Applied Chemistry for Engineering, Vol.32, No.4, 393-402, August, 2021
CO2/N2 분리를 위한 Pebax 혼합막에서 Zeolitic Imidazolate Framework-7의 영향
Effect of Zeolitic Imidazolate Framework-7 in Pebax Mixed Matrix Membrane for CO2/N2 Separation
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초록
본 연구는 대표적 poly(ether-b-amide)인 Pebax-1657과 Pebax-2533에 합성된 zeolitic imidazolate framework-7 (ZIF-7)을 넣어 혼합막을 제조하고, 단일기체 N2, CO2에 대한 투과 성질을 조사하였다. 기체투과 결과에서, N2의 경우 Pebax-1657/ZIF-7 혼합막과 Pebax-2533/ZIF-7 혼합막 모두 ZIF-7 혼입에 따라 투과도가 감소하는 비슷한 현상을 보였지만, CO2 투과도의 경우는 고분자에 종류에 따라 조금 다른 경향을 보였다. Pebax-1657/ZIF-7 혼합막의 경우는 ZIF-7의 0~3 wt% 함량 범위에서 CO2 투과도가 감소하다가 그 이후 함량에서 투과도가 증가하였고, Pebax-2533/ZIF-7 혼합막의 경우는 ZIF-7의 0~5 wt% 함량 범위에서 CO2 투과도 증가 없이 감소하였다. CO2/N2 선택도의 경우 두 혼합막 모두 ZIF-7의 함량이 많아짐에 따라 증가하는 경향을 보였으며, 특히 Pebax-2533/ZIF-7 5 wt%은 다른 혼합막들에 비해 가장 좋은 투과 성능을 보였다. 이는 ZIF-7이 Pebax-1657보다 Pebax-2533에 더 좋은 호환성을 보이며 CO2에 대한 선택적인 특성이 잘 나타났기 때문으로 생각된다.
In this study, a mixed matrix membrane was prepared by putting the zeolitic imidazolate framework-7 (ZIF-7) synthesized in Pebax-1657 and Pebax-2533, which are representative poly(ether-b-amide), and the permeability properties of single gas such as N2 and CO2 were investigated. From the gas permeation results, in the case of N2, both the Pebax-1657/ZIF-7 and Pebax-2533/ZIF-7 mixed matrix membranes showed a similar phenomenon in which the permeability decreased with the incorporation of ZIF-7. For CO2 permeability, the tendency was slightly different depending on the type of polymer. In the Pebax-1657/ZIF-7 mixed membrane, the CO2 permeability decreased in the range of 0~3 wt% of ZIF-7, and increased at higher contents. The CO2 permeability of the Pebax-2533/ZIF-7 mixed matrix membrane gradually decreased without increasing the permeability in the range of 0~5 wt% of ZIF-7. Regarding CO2/N2 selectivity, both mixed films showed a tendency to increase with increasing the ZIF-7 content. In particular, Pebax-2533/ZIF-7 5 wt% showed the best gas permeation performance compared to other mixed matrix membrane. This is thought to be because ZIF-7 shows better compatibility with Pebax-2533 than that of Pebax-1657 and also better CO2 selective property.
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