Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Pwevaporation Separation of Aqueous Ethanol Solution Through Poly(vinyl alcohol) Membranes Crosslinked Poly(acrylic acid-co-maleic acid)

Poly(acrylic acid-co-maleic acid)로 가교된 Poly(vinyl alcohol)막을 이용한 에탄을 수용액의 투과증발분리 특성

  • 남상용 (국립경상대학교 공과대학 고분자공학과) ;
  • 성경수 (한남대학교 공과대학 화학공학과) ;
  • 천세원 (한남대학교 공과대학 화학공학과) ;
  • 임지원 (한남대학교 공과대학 화학공학과)
  • Published : 2002.12.01
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Abstract

Poly(vinyl alcohol) (PVA) membranes crosslinked with poly(acrylic acid-co-maleic anhydride) (PAM) as a polymeric crosslinking agent were prepared to investigate the pervaporation performance for the dehydration separation of aqueous ethanol solution. The characteristics of the resulting membranes crosslinked(x) were analysed by FT-IR and water swelling test. The water swelling decreased with increasing crosslinking agent content. The crosslinked PVA membranes with PAM showed lower water swelling than those of PVA membrane crosslinked with glutaraldehyde and modified PVA membrane. The swelling of water molecules in the crosslinked PVA membranes is more restricted by both chemical crosslinking between PVA and polymeric crosslinking agent chains and physical crosslinking by the entanglement between the PVA and polymeric crosslinking agent chains. For the pervaporation of aqueous ethanol solution through the crosslinked membrane, as the contents of crosslinking agent increased, the separation factor increased while the permeation flux decreased. The separation factor slightly decreased and permeation flux increased with increasing feed water content. As a result it could be considered that PVA-PAM membranes suppressed the plasticization effect even in the range of high water concentration in fled.

폴리비닐알콜을 고분자계 가교제인 폴리아크릴산-말레산 공중합체를 이용하여 가교제의 농도를 변화시키면서 가교하여 막을 제조하였다. 제조한 막은 FT-IR과 수팽윤도 측정을 통하여 가교반응을 확인하였으며, 가교제 농도 증가에 따라서 수팽윤도가 감소하는 경향을 나타내었다. 고분자가교제인 폴리아크릴산-말레산 공중합체로 가교된 폴리비닐알콜 막은 글루탈알데히드로 가교된 폴리비닐알콜이나 변성 폴리비닐알콜 막에 비해서 수팽윤도가 감소하였다. 이는 고분자가교제에 의한 화학적가교와 더불어 물리적인 가교효과가 증가하여 막의 팽윤을 억제하기 때문으로 사료된다. 에탄올수용액에 대한 투과증발실험 결과 가교제의 농도가 증가할수록 선택도는 증가하며, 투과유량은 감소하는 경향을 나타내었으며, 공급액 중의 물의 농도가 증가할수록 선택도는 약간 감소하나 투과유량은 급격히 증가하고, 공급액 중의 물의 농도가 증가하여도 가소화현상이 나타나지 않는 것을 관찰하였다. 이는 고분자가교제에 의한 팽윤억제 메카니즘이 작용하기 때문으로 사료된다.

Keywords

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