Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Elucidation of the Mechanism of Propylene/Propane Separation through Faujasite Zeolite Membrane

Faujasite 제올라이트 분리막을 통한 프로필렌/프로판 분리 메카니즘 규명에 대한 연구

  • Min, Hae-Hyun (Department of Energy Science and Technology, Graduate School of Energy Science and Technology (GEST), Chungnam National University) ;
  • Park, You-In (Center for Convergent Chemical Process, National Research Council of Science & Technology) ;
  • Chang, Jong-San (Center for Convergent Chemical Process, National Research Council of Science & Technology) ;
  • Park, Yong-Ki (Center for Convergent Chemical Process, National Research Council of Science & Technology) ;
  • Cho, Churl-Hee (Department of Energy Science and Technology, Graduate School of Energy Science and Technology (GEST), Chungnam National University)
  • 민혜현 (충남대학교 에너지과학기술대학원 에너지과학기술학과) ;
  • 박유인 (국가과학기술연구회 CCP융합연구단) ;
  • 장종산 (국가과학기술연구회 CCP융합연구단) ;
  • 박용기 (국가과학기술연구회 CCP융합연구단) ;
  • 조철희 (충남대학교 에너지과학기술대학원 에너지과학기술학과)
  • Received : 2018.10.22
  • Accepted : 2018.10.27
  • Published : 2018.10.31
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Abstract

In this study, propylene/propane separation mechanism through NaY zeolite membrane was investigated. As permeation temperature increased, both propylene and propane permeances increased, saturated and decreased again, and a maximum selectivity was shown at around 50 to $60^{\circ}C$. Propane permeance in mixed gas experiment was much smaller than that in single gas experiment, and propylene/propane mixed gas selectivity was much larger than single gas permselectivity. As permeation time increased in transient permeation experiment, propylene permeance initially increased and saturated, while propane permeance decreased and saturated. All the experimental results announced that propylene/propane separation through NaY zeolite membrane was from preferentially adsorbed propylene molecules. The adsorbed propylene molecules efficiently prevented propane molecules from permeating through the membrane, and sufae diffused through the membrane. NaY zeolite capillary membrane prepared in the present study showed a high mixed gas selectivity of 12 and high propylene permeance of 497 GPU for a propylene/propane (89 : 11) mixture at $50^{\circ}C$ and 4 bar. Therefore, it was concluded that NaY zeolite membrane is one of promising membrane materials for propylene/propane separation due to the low cost and high separation performance.

본 연구에서는 NaY 제올라이트 분리막의 프로필렌/프로판 분리 메카니즘을 규명하고자 하였다. 투과온도 증가 시에 프로필렌과 프로판 투과도는 증가하다 최고점을 보이고 감소하였고 약 $50-60^{\circ}C$ 부근에서 최대 선택도를 보였다. 혼합가스 프로판 투과도는 단일가스 투과도 보다 작았고, 프로필렌/프로판 혼합가스 선택도는 단일가스 투과선택도보다 우수하였다. 시간에 따른 혼합가스 투과거동 실험에서, 투과시간이 증가함에 따라서 프로필렌 투과도는 증가하는 반면, 프로판의 투과도는 감소하였고 선택도는 증가하였다. 위의 모든 실험결과는 NaY 제올라이트 분리막을 통한 프로필렌/프로판 분리는 선택적으로 흡착된 프로필렌의 프로판 투과 억제에 의해 일어나며 프로필렌 투과는 표면확산에 의해 지배된다는 것을 나타낸다. 프로필렌/프로판(89 : 11) 혼합가스에 대하여 분리막은 $50^{\circ}C$, 4 bar에서 선택도 12, 프로필렌 투과도 497 GPU를 나타내었다. 따라서 본 연구에서 제조된 NaY 제올라이트 모세관 분리막은 가격이 저렴하고 우수한 분리성능을 보이기 때문에 프로필렌/프로판 분리를 위한 유망한 분리막 소재임을 확인할 수 있었다.

Keywords

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