Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Pervaporation Separation of Trace Dicholoromethane from Water Using Fluorinated Polysiloxaneimide do Membranes

불소계 폴리실록산이미드 공중합체막을 이용한 저농도 Dichloromethane 수용액의 투과증발

  • Kim, Jeong-Hoon (Environment & Energy Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology) ;
  • Chang, Bong-Jun (Environment & Energy Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology) ;
  • Lee, Soo-Bok (Biorefinery Research Center, Sustainable Chemical Technologies, Korea Research Institute of Chemical Technology)
  • 김정훈 (한국화학연구원 신화학연구단 환경에너지연구센터) ;
  • 장봉준 (한국화학연구원 신화학연구단 환경에너지연구센터) ;
  • 이수복 (한국화학연구원 신화학연구단 바이오리파이너리연구센터)
  • Published : 2007.09.30
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Abstract

This study reports on the pervaporation separation of a volatile organic compound(VOC), dichloromethane(DCM) from water using fluorinated copolysiloxaneimide membranes. The copolysiloxaneimide membranes were prepared from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA) and two diamines(polysiloxane diamine(SIDA), 2-(perfluorohexyl)ethyl-3,5-diaminobenzene(PFDAB)). By varying the ratio of flexible polysiloxane diamine(SIDA)/rigid fluorinated aromatic diamine(PFDAB) from 0/100 to 100/0 mol%, five copolysiloxaneimide membranes were prepared success- fully. The pervaporation properties of DCM/water were examined in terms of two diamine monomer ratio at room temperature and the feed composition of 0.05 wt% in water. It was found that the increase in SIDA content led to high permeation flux and pervaporation selectivity towards DCM by the enhanced sorption/sorption selectivity and diffusion coefficient/diffusion selectivity due to the increased hydrophobicity and fractional free volume.

본 연구는 불소계 폴리실록산이미드 공중합체 막을 이용하여 휘발성 유기 화합물(Volatile Organic Compounds; VOCs)의 일종인 dichloromethane(DCM)을 물로부터 투과증발 분리하는 것을 목적으로 한다. 유연한 사슬을 갖는 diamine-terminated polydimethylsiloxane(SIDA)과 경직된 구조를 갖는 불소계 방향족 디아민 단량체(2-(perfluorohexyl)ethyl-3,5-diaminobenzene PFDAB)과 4,4'-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)를 이용하여 일련의 소수성 불소계 폴리실록산이미드 공중합체 막을 제조하여 다이아민의 구성성분에 따른 분리능의 변화를 상온에서 관찰하였다. 공중합체 막 내의 다이아민 성분 중 SIDA의 함량은 0, 25, 50, 75, 100 mol%로 조절되었으며, 원액의 조성은 DCM 0.05 wt%를 사용하였다. 소수성이 높고 자유부피가 큰 SIDA의 함량이 증가함에 따라 소수성 용매인 DCM의 수착도 및 수착선택도가 증가하는 경향을 나타내었으며, 확산계수 및 확산선택도 또한 증가하여 궁극적으로는 투과플럭스와 투과선택도가 증가하는 것을 확인할 수 있었다.

Keywords

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