Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation and Characterization of Nanofiltration Membrane for Recycling Alcoholic Organic Solvent

알코올성 유기용매 재활용을 위한 나노여과막의 제조와 특성평가

  • Kim, Seong Heon (Department of Polymer Science & Engineering School of Materials Science & Engineering Gyeongsang National University) ;
  • Im, Kwang Seop (Department of materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Kim, Ji Hyeon (Department of materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Koh, Hyung Chul (Research Institute for Green Energy Convergence Technology, Gyeongsang National University) ;
  • Nam, Sang Yong (Department of Polymer Science & Engineering School of Materials Science & Engineering Gyeongsang National University)
  • 김성헌 (경상국립대학교 나노신소재공학부 고분자공학과) ;
  • 임광섭 (경상국립대학교 나노신소재융합공학과) ;
  • 김지현 (경상국립대학교 나노신소재융합공학과) ;
  • 고형철 (경상국립대학교 그린에너지융합연구소) ;
  • 남상용 (경상국립대학교 나노신소재공학부 고분자공학과)
  • Received : 2021.06.26
  • Accepted : 2021.06.28
  • Published : 2021.06.30
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Abstract

The organic solvent robust polybenzimidazole (PBI) membranes were prepared as organic solvent nanofiltration (OSN) membrane for the recycling of alcoholic solvents using non-solvent induced phase separation with different dope solution concentration and coagulant composition of water/ethanol mixtures to control the membrane morphology and permeation performance. Investigation on crosslinking of polybenzimidazole indicated that the membrane crosslinked with dibromoxylene (DBX) had enough mechanical strength and solvent resistance to be applied as a OSN membranes. The crosslinked PBI membrane prepared by more than 20wt% dope concentration coagulated in water showed a rejection of > 90% to Congo Red (MW of 696.66 g/mol) while pure ethanol permeances was more than 22.5 LMH/bar at 5 bar. Investigation on coagulant composition indicated that ethanol permeance through crosslinked PBI OSN membrane increased with increasing of ethanol concentration in water/ethanol mixture coagulants.

알코올성 용제를 재활용할 수 있는 목적의 유기용제나노여과막(OSN)을 내용제성이 우수한 폴리벤지다졸 고분자를 이용하여 비용매 유도 상분리법을 이용하여 제조하였다. 제조한 나노여과막의 모폴로지와 투과특성을 조절하기 위하여 도프 용액의 농도와 물과 에탄올의 혼합용액인 응고액의 조성을 변화시키면서 제조하였다. α,α'-dibromo-p-xylene (DBX)을 이용하여 가교한 폴리벤지미다졸 분리막은 유기용제나노여과막으로 사용하기에 충분한 기계적 강도와 내용제성을 갖는 것을 확인하였다. 물로만 이루어진 응고조에서 도프용액의 농도가 20%이상인 분리막을 제조하는 경우에 분자량 696.66 g/mol을 가지는 콩고레드에 대한 제거율은 90% 이상을 나타내었고, 투과도는 5 bar의 압력에서 22.5 LMH/bar를 나타내었다. 응고액 조성에 대한 연구를 통해서 응고액 중의 에탄올 농도가 증가할수록 에탄올의 투과도가 증가하는 것을 확인하였다.

Keywords

Acknowledgement

본 연구는 2021년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원에 의한 연구(10080703)와 2021년도 정부 (교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (NRF-2020R1A6A1A03038697)

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