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The Membrane Society of Korea (한국막학회)
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Preparation and Pervaporative Alcohol Dehydration of Crystallographically b/c-axis Oriented Mordenite Zeolite Membranes

결정학적으로 b/c-축 방향으로 배향된 모데나이트 제올라이트 분리막의 제조 및 투과증발 알코올 탈수 거동

  • 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) ;
  • Kim, Min-Zy (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)
  • 김영무 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 이두형 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 김민지 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 조철희 (충남대학교 에너지과학기술대학원 에너지과학기술학과)
  • Received : 2018.10.22
  • Accepted : 2018.10.27
  • Published : 2018.10.31
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Abstract

In the present study, crystallographically b- and c-axis oriented mordenite zeolite membranes were prepared and their pervaporative ethanol dehydration was investigated. The seed layer with a high coverage grew to be c-axis oriented dense layer, while the seed layer with a low coverage grew to be b-axis oriented layer. This phenomenon could be explained by the evolutionary selection growth mechanism. The b-axis grown membrane with 8-membered rings showed a high separation factor of above 1000 and a considerable total flux of around $0.2kg/m^2h$. The c-axis grown, columnar structured membrane with 8- and 12-membered rings showed a low separation factor of less than 200 and a relatively high total flux of around $0.25kg/m^2h$. The high performance of b-axis grown membrane was due to the relatively small opening of 8-membered rings. Water molecules can freely permeate through the openings, but ethanol molecules, difficultly. Therefore, in the present study, we introduced a new method to control crystallographic orientation of mordenite membrane by changing seeding amount of needle-like crystals, and elucidated that b-axis oriented mordenite membrane showed better performance than c-axis grown mordenite membrane.

본 연구에서는 바늘형 종결정 코팅 양을 조절함으로써 결정학적으로 b-축 그리고 c-축으로 배향된 모데나이트(MOR) 제올라이트 분리막을 제조하고 결정학적 배향이 투과증발 에탄올 탈수 거동에 미치는 영향을 고찰하였다. c-축으로 배향된 종결정의 코팅 양이 증가할수록 b-축에서 c-축으로 배향된 분리막이 얻어졌고 이는 진화론적 성장으로 설명되었다. b-축 방향으로 배향된 분리막의 경우 1000 이상의 높은 선택도와 $0.2kg/m^2h$의 총 투과도를 나타내었으며 c-축 배향된 분리막 보다 우수한 분리성능을 나타내었다. 이는 물의 운동역학적 직경이 b-축 방향으로 단일 존재하는 8R 기공채널의 직경에 비하여 작기 때문에 물의 이동이 방해되지 않는 반면 에탄올은 상대적으로 방해받기 때문으로 설명되었다. 따라서 본 연구로부터 바늘형 종결정 코팅 양을 조절함으로써 모데나이트 분리층의 결정학적 배향을 조절할 수 있었고, b-축으로 배향된 모데나이트 분리막이 보다 우수한 투과증발 에탄올 탈수 거동을 보임을 확인할 수 있었다.

Keywords

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