Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Clean Separation of Difluoromonochloromethane(R22)/Hexafluoropropylene(HFP) by Using Liquid-Supported Membrane(BMIBF4/PVDF)

고정화 액막(BMIBF4/PVDF)에 의한 디플루오로-클오로메탄과 헥사플루오로프로필렌의 청정분리

  • Choi, Pyoung-Ho (Applied Chemical Research Division, Korea Research Institute of Chemical Technology(KRICT)) ;
  • Kim, Chul-Ung (Applied Chemical Research Division, Korea Research Institute of Chemical Technology(KRICT)) ;
  • Kim, Beom-Sik (Applied Chemical Research Division, Korea Research Institute of Chemical Technology(KRICT)) ;
  • Lee, Jung-Min (Applied Chemical Research Division, Korea Research Institute of Chemical Technology(KRICT)) ;
  • Koo, Kee-Kahb (Department of Chemical Engineering, Sogang University)
  • 최평호 (한국화학연구원 응용화학연구부) ;
  • 김철웅 (한국화학연구원 응용화학연구부) ;
  • 김범식 (한국화학연구원 응용화학연구부) ;
  • 이정민 (한국화학연구원 응용화학연구부) ;
  • 구기갑 (서강대학교 화학공학과)
  • Received : 2003.10.20
  • Accepted : 2003.11.20
  • Published : 2003.12.01
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Abstract

In order to develope a clean technology by liquid-supported membrane of ionic liquid/PVDF, the solubility of R22 and HFP gases using BMIBF4 as ionic liquid were measured at temperatures from 0 to $30^{\circ}C$, at total pressures up to 4 bars. The solubility of R22 in this ionic liquid was shown a rapid increasing tendency with increases of pressure and decreases of temperature, respectively, whereas the solubility of HFP was showed only a little in the same conditions. Based on these results, liquid-supported membranes of ionic liquid/PVDF were prepared by variables of the deposition amount of ionic liquid in polymer matrix, PVDF and were applied to the separation of fluoro-gases(R22, HFP) including $N_2$ gas. The permeability of R22 was rapidly increased by depending on the deposition amounts of ionic liquid, whereas both of HFP and $N_2$ were just showed so little. Especially, the diffusivity coefficient and solubility parameter of R22 were increased by lower operating temperatures and increased deposition amount of ionic liquid in 1iquid membrane. In conclusion, the selectivity of R22 against HFP was changed to 10-45 times depending on both of operating temperatures and the deposition amount of ionic liquid in BMIBF4/PVDF liquid membrane.

온도(0 to $30^{\circ}C$)와 압력(4 bar까지)의 함수로서 이온성액체인 buthylmethylimidazolium tetrafluoride ($BMIBF_4$)에 관한 디플루오로클로로메탄($CHCIF_2$, R22)과 헥사플루오로프로필렌($C_3F_6$, HFP) 가스의 용해도 실험을 실시하였는데, R227가스의 용해도는 온도가 낮거나, 압력이 증가할수록 거의 선형적으로 증가한 반면, HFP 가스는 거의 용해도를 나타내지 않았다. 이어서 이 이온성액체를 고분자지지체인 polyvinylidenefluoride(PVDF)에 함침량을 달리하여 액막을 제조하였으며, 일정한 압력(3 atm)에서 가스분리막 장치를 사용하여 액막의 이온성액체 함침량 변화와 조업온도의 함수로 R22, HFP 및 $N_2$ 가스의 투과특성 실험을 실시하였다. 실험결과, R22의 투과도는 주로 이온성액체의 함침량에 의존하여 급격히 증가하였으며, HFP 및 $N_2$의 투가도는 거의 0에 가까운 매우 낮은 값을 나타내었다. 또한 R22의 확산계수 및 용해도계수는 조업온도가 낮거나 액막에서 이온성액체의 함침량에 비례하여 증가하였다. 결과적으로 R22에 관한 HFP가스의 선택도는 조업온도와 액막의 이온성액체 함침량에 의존하여 10-45배 정도까지 매우 높은 값올 나타내었다.

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