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The Membrane Society of Korea (한국막학회)
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Propylene/Nitrogen Separation Membranes Based on Amphiphilic Copolymer Grafted from Poly(1-trimethylsilyl-1-propyne)

양친성 고분자가 그래프팅된 Poly(1-trimethylsilyl-1-propyne) 기반의 프로필렌/질소 분리막

  • Park, Cheol Hun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Lee, Jae Hun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Min Su (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 박철훈 (연세대학교 화공생명공학과) ;
  • 이재훈 (연세대학교 화공생명공학과) ;
  • 박민수 (연세대학교 화공생명공학과) ;
  • 김종학 (연세대학교 화공생명공학과)
  • Received : 2019.03.28
  • Accepted : 2019.04.14
  • Published : 2019.04.30
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Abstract

Hydrocarbons containing carbon double bonds are generally called olefins and it is extensively used in petro-chemical industry as essential base material. Especially, olefins are essential in polymer synthesis and thus the effective separation and purification of olefins from gas mixture are very important and it gives significant positive effect on the future industrial development. In this study, we fabricated polymeric composite membrane based on poly(1-trimethylsilyl-1-propyne) (PTMSP) for propylene/nitrogen separation and enhancement of its separation performance by grafting amphiphilic copolymer. Furthermore, to accelerate facilitated transport for propylene molecules, Ag salt ($AgBF_4$) and ionic liquid ($EMIM-BF_4$) was incorporated to polymer composite membranes. The neat PTMSP membrane exhibited extremely high gas permeance and low gas selectivity due to its high free volume. To address this issue, PTMSP was grafted with poly(oxyethylene glycol methacrylate) (POEM) and poly(ethylene glycol) behenyl ether methacrylate (PEGBEM). Additionally, the additives such as $AgBF_4$ and $EMIM-BF_4$ further increased the propylene permeance, resulting in increment of propylene/nitrogen selectivity.

올레핀은 석유화학산업에서 대부분의 물질의 근간이 되는 핵심적인 물질이며 특히 고분자 합성에 있어 매우 중요하다. 이러한 올레핀 물질을 효율적으로 분리/가공하는 공정은 산업발전에 있어 지대한 영향을 끼친다. 본 연구에서는 올레핀 물질 중 프로필렌 기체를 선택적으로 분리하는 고분자 복합막을 제조하여 투과 및 선택 성능을 증대시키고자 고투과성 매질인 poly(1-trimethylsilyl-1-propyne) (PTMSP)에 양친성 고분자를 이용하여 개질하였다. 또한 올레핀 분자와 상호작용이 있는 $AgBF_4$ 염 및 촉진수송을 극대화 시키기 위하여 이온성 액체인 $EMIM-BF_4$를 첨가하여 올레핀/질소 투과 분리 성능을 향상시켰다. 기존 PTMSP 복합막의 경우 굉장히 높은 자유부피를 가져 높은 기체 투과성능을 보이는 반면 투과시키고자 하는 기체에 대한 선택적인 분리 성능이 매우 떨어져 낮은 선택도를 보인다. 이를 극복하고자 양친성 고분자를 PTMSP 계면에 그래프트 공중합을 시켰으며 올레핀과 높은 상호작용을 보이는 $AgBF_4$ 염 및 $EMIM-BF_4$ 이온성 액체를 첨가하여 프로필렌/질소에 대한 선택도를 향상시켰다.

Keywords

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