멤브레인 (Membrane Journal)

  • 제26권2호
  • /
  • Pages.126-134
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  • 2016
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
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CO2/CH4 분리를 위한 프로필렌카보네이트/물 흡수제 특성 평가 및 막접촉기의 적용

Evaluation of Propylenecarbonate/water Physical Absorbents and its Application in Membrane Contactors for CO2/CH4 Separation

  • 박아름이 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 김성중 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 이평수 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 남승은 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 박유인 (한국화학연구원 그린화학소재연구본부 분리막연구센터)
  • Park, Ahrumi (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Kim, Seong-Joong (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Lee, Pyung Soo (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Nam, Seung Eun (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, You In (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 투고 : 2016.04.11
  • 심사 : 2016.04.26
  • 발행 : 2016.04.30
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초록

바이오 가스로부터 바이오 메탄을 생산하기 위해 물리흡수제 특성평가 및 $CO_2/CH_4$흡수 연구를 진행하였고, poly-propylene(PP) 중공사막 막접촉기에 적용해보았다. 물리흡수제 중 propylene carbonate (PC)는 PP 중공사막과 가장 높은 $58.3^{\circ}$ 접촉각을 보였고, 5 wt% PC를 물과 혼합할 경우 $90^{\circ}$ 이상의 접촉각이 관찰되었다. 또한 $CO_2$ 흡수실험에서 PC/물 혼합 흡수제는 물 흡수량(0.121 mmol/g) 보다 높은 0.148-0.157 mmol/g의 흡수량을 보이며, 막접촉기에 가장 적합한 물리흡수제로 선정되었다. PC/물 혼합 흡수제를 막접촉기에 적용 후 얻어진 $CO_2$ 제거율(98.0-97.8%)과 $CH_4$ 순도(98.5-98.3%)는 바이오 메탄으로서 매우 높은 가능성을 보여주었다. 하지만 PC/물 혼합 흡수제의 경우에는 물 흡수제와 비교하여 성능 변화가 매우 미비하였다. 이는 물보다 우수한 PC 흡수능과 함께 그에 따른 막접촉기 탈기 막 모듈 및 시스템 개선과 공급 유량 조절을 통해 $CH_4$ 손실 최소화 등 공정 최적화가 필요한 것으로 분석된다.

To produce renewable biomethane from biogas, the properties of physical absorbents such as water, methanol, 1-methyl-2-pyrrolidone (NMP), poly(ethylene glycol) dimethylether (PEGDME), and propylene carbonate (PC) were studied, and PC was applied to membrane contactor systems. Among physical absorbents, PC exhibited a high contact angle of $58.3^{\circ}$ on polypropylene surface, and a PC/water mixture (5 wt%) increased the contact angle to $90^{\circ}$. Furthermore, the PC/water mixture presented higher $CO_2$ absorption capacities (0.148-0.157 mmol/g) than that of water (0.121 mmol/g), demonstrating a good property as an absorbent for membrane contactors. Actual operations in membrane contactors using the PC/water mixture resulted in $CO_2$ removal of 98.0-97.8% with biomethane purities of 98.5-98.3%, presenting a strong potential for biogas treatment. However, the PC/water mixture yielded moderate improved in $CO_2$ removal and methane recovery, as compared with water in the membrane contactor operation. This is originated from insufficient desorption processes to reuse absorbent and low $CO_2$ flux of the PC/water absorbent. Thus, it is requiring optimizations of membrane contactor technology including development of absorbent and improvement of operation process.

키워드

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