Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Gas Permeation Properties of CO2 and CH4 for PEBAX®/Fumed Silica Hybrid Membranes

PEBAX®/fumed silica 하이브리드 분리막을 통한 CO2와 CH4의 기체투과특성

  • Kim, Hyunjoon (Department of Chemical Engineering, Kyonggi University)
  • Received : 2022.02.04
  • Accepted : 2022.02.23
  • Published : 2022.02.28
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Abstract

The objective of this work was to investigate the gas permeation properties of CO2 and CH4 for PEBAX®/TS-530 hybrid membranes and compare with pure PEBAX®-1657 membrane. With FTIR and XRD it was possible to confirm that TS-530 was dispersed well in PEBAX® matrix. Compared with pure PEBAX® membrane, ideal separation factor for PEBAX®/TS-530 (10 wt%) hybrid membrane was enhanced a little. As the amount of TS-530 was increased, the gas permeability coefficients of both CO2 and CH4 were increased, while the ideal separation factor was decreased. This results were explained by the reduction of crystallinity of polyamide block and interchain distance caused by introduction of inorganic nanoparticles. And fumed silica might tend to agglomerate, resulting in forming nonselective nanogaps in the hybrid materials, thus the diffusivity would be enhanced at the expense of diffusivity selectivity.

본 연구에서는 순수 PEBAX® 분리막의 투과특성을 향상시키기 위해 개질된 fumed silica 나노입자를 혼합한 MMMs (mixed matrix membranes) 타입의 PEBAX®/fumed silica 하이브리드 분리막을 제조하고, 이산화탄소와 메탄의 투과 특성을 측정하였다. PEBAX®-1657/TS-530 하이브리드 소재의 경우, FT-IR과 XRD 분석을 통해 PEBAX® 고분자에 무기입자가 비교적 잘 분산되었음을 확인하였다. 기체투과특성 측정 결과 TS-530을 10 wt% 혼합한 분리막의 경우, 순수 PEBAX® 분리막과 비교하여 투과도 계수는 약간 감소하나 이상분리인자는 약간 증가하였다. 이는 비투과성 silica 입자의 도입에 따라 기체 확산 경로가 줄어들고, 경로의 비틀림이 증가하기 때문으로 볼 수 있다. TS-530 함량이 증가함에 따라서는 투과도 계수와 이상분리인자 간에 전형적인 trade-off 경향을 보였다. 이는 TS-530 함량이 증가함에 따라 결정성이 감소하고, 고분자 사슬 간 충전 억제에 따라 자유부피가 증가하기 때문으로 볼 수 있다. 또한 무기입자 함량 증가에 나노간극의 형성 가능성이 높아지고, 이에 따라 기체 확산도가 커지기 때문으로 판단된다.

Keywords

Acknowledgement

본 논문은 2021학년도 경기대학교 연구년 수혜로 연구되었습니다.

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