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The Membrane Society of Korea (한국막학회)
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Preparation and Properties of Hollow Fiber Membrane for CO2/H2 Separation

이산화탄소/수소 분리용 중공사형 기체분리막의 제조 및 특성

  • Hyung Chul Koh (Carbon Neutral Maneuver Center, Environmental Technology Division, Korea Testing Laboratory) ;
  • Mi-jin Jeon (Carbon Neutral Maneuver Center, Environmental Technology Division, Korea Testing Laboratory) ;
  • Sang-Chul Jung (Carbon Neutral Maneuver Center, Environmental Technology Division, Korea Testing Laboratory) ;
  • Yong-Woo Jeon (Carbon Neutral Maneuver Center, Environmental Technology Division, Korea Testing Laboratory)
  • 고형철 (한국산업기술시험원 환경기술본부 탄소중립대응센터) ;
  • 전미진 (한국산업기술시험원 환경기술본부 탄소중립대응센터) ;
  • 정상철 (한국산업기술시험원 환경기술본부 탄소중립대응센터) ;
  • 전용우 (한국산업기술시험원 환경기술본부 탄소중립대응센터)
  • Received : 2023.07.03
  • Accepted : 2023.08.28
  • Published : 2023.08.31
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Abstract

In this study, a hollow fiber support membrane was prepared by a non-solvent induced phase separation (NIPS) method using a polysulfone (PSf). The prepared hollow fiber support membrane was coated with PDMS and Pebax to prepare a hollow fiber composite membrane. The prepared composite membrane was measured for permeance and selectivity for pure CO2, H2, O2 and N2. Gas separation performance of the module having the highest selectivity (CO2/H2) among the prepared composite membrane modules was measured according to the change in stage cut using simulated gas. The composition of the simulated gas used at this time was 70% CO2 and 30% H2. In the 1 stage experiment, it was possible to obtain values of about 60% of H2 concentration and 12% of H2 recovery. In order to overcome the low H2 concentration and recovery, 2 stage serial test was performed, and through this, it was possible to achieve 70% H2 concentration and 70% recovery. Through this, it was possible to derive a separation process configuration for CO2/H2 separation.

본 연구에서는 중공사형 지지체막을 폴리술폰(polysulfone, PSf) 고분자를 이용하여 비용매 상분리법(non solvent induced phase separation, NIPS)에 의해 제조하였다. 제조된 중공사 지지체막을 PDMS와 Pebax를 코팅하여 중공사형 복합막을 제조하고 CO2, H2, O2 그리고 N2에 대한 순수 투과도(permeance)와 선택도를 측정하였다. 제조된 복합막 모듈 중에서 선택도(CO2/H2)가 가장 높은 모듈을 선정하여 모사가스를 사용하여 스테이지컷(stage cut, SC)의 변화에 따라 분리성능을 측정하였다. 이때 사용된 모사가스는 PSA에서 버려지는 off gas의 농도인 CO2 70% : H2 30%인 것을 사용하였다. 1단 실험에서는 H2 농도 약 60%, H2 회수율 12%의 값을 얻을 수 있었다. 낮은 H2 농도와 회수율을 극복하기 위해 2단 직렬 테스트를 수행하였으며, 이를 통해 H2 농도 약 70%, H2 회수율 70%를 달성할 수 있었으며, 이를 통해 CO2/H2 분리에 대하여 분리 공정 구성을 도출할 수 있었다.

Keywords

Acknowledgement

이 논문은 2023년도 정부(산업통상자원부)의 재원으로 한국 에너지 기술 평가원의 지원을 받아 수행된 연구임(과제번호 : 20213030040070) 이 논문은 2023년도 정부(환경부)의 재원으로 한국환경산업기술원의 지원을 받아 수행된 연구임(과제번호 : RE202106004)

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