Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Improvement of Pervaporative Water Flux of Mordenite Zeolite Membrane by Controlling Membrane Thickness

분리막 두께 조절에 의한 모데나이트 제올라이트 분리막의 투과증발 물 투과유속 증진 연구

  • Yoon, Byung-jin (Graduate School of Energy Science and Technology (GEST), Chungnam National University) ;
  • Kim, Young-mu (Graduate School of Energy Science and Technology (GEST), Chungnam National University) ;
  • Lee, Du-Hyoung (Graduate School of Energy Science and Technology (GEST), Chungnam National University) ;
  • Cho, Churl-Hee (Graduate School of Energy Science and Technology (GEST), Chungnam National University)
  • 윤병진 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 김영무 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 이두형 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 조철희 (충남대학교 에너지과학기술대학원 에너지과학기술학과)
  • Received : 2019.10.21
  • Accepted : 2019.10.28
  • Published : 2019.10.31
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Abstract

In the present study, thickness of MOR zeolite membranes was controlled by changing seed size, seeding amount, and aging time of hydrothermal solution, and then effect of membrane thickness on pervaporative ethanol dehydration for 90 wt.% ethanol-water mixture was investigated. First, nanosize MOR zeolite seeds with a diameter of 20 to 30 nm was successfully prepared by planetary milling a laboratory synthesized MOR zeolites and the coating amount was controlled by seed concentration and infiltration volume of coating solution during vacuum-assisted seeding. As seeding amount decreased, membrane thickness was reduced up to around $4{\mu}m$. The MOR zeolite membrane having a thickness of $4{\mu}m$ showed a water/ethanol separation factor of 760 and water flux of $1.0kg/m^2h$. The excellent water flux was due to the reduced membrane thickness which was derived from the nanosize seed. Therefore, it could be concluded that membrane thickness control by using nanosize seed can be a crucial factor to improve pervaporative water flux of MOR zeolite membrane.

본 연구에서는 종결정 크기, 종결정 코팅양, 수열 용액 숙성시간을 조절함으로써 분리층 두께가 제어된 모데나이트 제올라이트 분리막을 제조하고, 분리층 두께가 투과증발 물 투과유속에 미치는 영향을 90 wt.% 에탄올 수용액에서 고찰하였다. 유성 밀을 이용해 종결정을 분쇄시켜 20~30 nm 크기의 종결정을 제조하였고, 진공여과코팅 중에 종결정 용액의 농도와 통과된 양을 바꿔주면서 코팅양을 조절하였다. 제조된 분리막은 분리층 두께가 얇을수록 더 높은 물 투과유속을 나타내었으며, 약 $4{\mu}m$ 두께를 갖는 분리막의 경우, 760의 높은 물/에탄올 선택도와 $1.0kg/m^2h$의 높은 물 투과유속을 나타내었다. 이는 나노크기 종결정을 사용하여 $4{\mu}m$ 두께로 분리층을 얇게 만들었기 때문으로 판단된다. 따라서 본 연구로부터 종결정의 크기와 진공여과 코팅양, 수열 용액 숙성시간을 조절하는 것은 분리 층의 두께를 효과적으로 조절할 수 있는 방법임을 알았다. 또한, 모데나이트 제올라이트 분리층의 두께를 얇게 하는 것이 분리막의 물 투과유속을 증진시키는 중요한 방법임을 확인하였다.

Keywords

References

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