화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.25, No.6, 559-563, December, 2014
Export Citation
PVDF-HFP/이온성 액체 겔 분리막 제조 및 기체 투과도 측정
Preparation and Gas Permeability Measurements of PVDF-HFP/Ionic Liquid Gel Membranes
고영덕, 박두환1, 백일현1, 홍성욱†
  • 한밭대학교 화학생명공학과
  • 1한국에너지기술연구원 온실가스연구실
Youngdeok Ko, Doohwan Park1, Ilhyun Baek1, and Seong Uk Hong†
  • Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 305-719, Korea
  • 1Green House Gas Research Center, Korea Institute of Energy Research, Daejeon 305-343, Korea
E-mail:
초록
상온에서 액체 상태인 이미다졸리움 계열의 이온성 액체에 이산화탄소가 잘 흡수된다는 사실은 잘 알려져 있다. 이러한 이산화탄소의 고용해도 때문에 이온성 액체를 포함하는 분리막은 이산화탄소/질소, 이산화탄소/메탄과 같은 기체 혼합물을 잘 분리할 수 있다. 본 연구에서는 다양한 종류의 이온성 액체를 포함하는 poly(vinylidene fluoride)-hexafluoropropyl copolymer (PVDF-HFP) 겔 분리막을 제조하고 여러 기체의 투과도를 측정하였다. 음이온이 tetrafluoroborate (BF4-)인 경우, 양이온의 탄소수가 증가할수록 이산화탄소의 투과도와 선택도가 모두 감소하였다. 양이온이 1-ethyl-3-methylimidazolium[ emim]인 경우, 음이온이 tetrafluoroborate (BF4-)일 때에 비해서 bis(trifluoromethane)sulfoneimide (Tf2N-)일 때 이산화탄소의 투과도가 2배 정도 증가하였으나, 이산화탄소/질소 및 이산화탄소/메탄의 선택도는 감소하였다. 하지만 이산화탄소/수소 선택도는 두 경우에 거의 비슷하였다.
It is well known that CO2 can be dissolved easily in imidazolium-based room temperature ionic liquids (RTILs). Because of the high CO2 solubility in RTILs, membranes containing RTILs can separate easily gas mixtures such as CO2/N2 and CO2/CH4. In this study, we prepared poly(vinylidene fluoride)-hexafluoropropyl copolymer (PVDF-HFP) gel membranes with several RTILs and measured permeabilities of several gases. When the anion of ionic liquids was tetrafluoroborate(BF4-), both CO2 permeability and selectivities decreased as the carbon number of the cation increased. When the cation of ionic liquids was 1-ethyl-3-methylimidazolium[emim], CO2 permeability of gel membranes containing bis(trifluoromethane) sulfoneimide(Tf2N-) anion was double compared to those containing tetrafluoroborate(BF4-) anion. However, CO2/N2 and CO2/CH4 selectivities of the Tf2N- case were decreased, whereas the H2 selectivity was almost the same for two cases.
Keywords:Gas permeability;PVDF-HFP;ionic liquid;carbon dioxide
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