Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Phase Behavior of Sorbitan Monopalmitate Surfactant in Supercritical Carbon Dioxide

초임계 이산화탄소에서 소르비탄 모노팔미테이트 계면활성제의 상거동에 관한 연구

  • Oh, Kyung Hwan (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology) ;
  • Kim, Eun Jin (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology) ;
  • Shin, Hun Yong (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology)
  • 오경환 (서울과학기술대학교 화공생명공학과) ;
  • 김은진 (서울과학기술대학교 화공생명공학과) ;
  • 신헌용 (서울과학기술대학교 화공생명공학과)
  • Received : 2012.11.26
  • Accepted : 2012.12.27
  • Published : 2013.03.31
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Abstract

Phase behavior of carbon dioxide + surfactant binary system and carbon dioxide + surfactant + water ternary system was investigated at the temperatures from 318 K to 348 K by using high pressure vapor liquid equilibrium apparatus containing variable-volume view cell. Sorbitan monopalmitate was used as the surfactant. The cloud point pressures for the binary mixture of carbon dioxide + sorbitan monopalmitate increased with an increasing of system temperatures and the maximum cloud point pressure was observed at the composition of 0.226 wt% of sorbitan monopalmitate. On the other hand, as the temperatures and compositions of water increased, the cloud point pressures for ternary system containing 0.1 wt% of sorbitan monopalmitate increased significantly. For the ternary system of constant 0.2 wt% of water, the cloud point pressure curves show relatively flat according to the change of compositions of surfactant. The cloud point pressures increased when the temperatures and compositions of water increased.

가변부피 투시셀이 장착된 고압 상평형 장치를 사용하여 이산화탄소 + 계면활성제 이성분계와 이산화탄소 + 계면활성제 + 물 삼성분계의 상평형 거동을 318 K부터 348 K의 온도범위에서 관찰하였다. 계면활성제로는 소르비탄 모노팔미테이트를 사용하였다. 이산화탄소 + 소르비탄 모노팔미테이트 이성분계에서 관측된 운점압력은 온도가 상승함에 따라 증가하며, 소르비탄 모노팔미테이트의 조성이 0.226 wt%에서 최대 운점압력이 측정되었다. 반면에 계면활성제의 농도를 0.1 wt%로 고정한 삼성분계에서 관측된 운점압력은 온도와 물의 조성이 증가함에 따라 커지는 것을 확인할 수 있었다. 물의 농도를 0.2 wt%로 고정한 삼성분계에서의 압력-조성의 곡선은 상대적으로 수평의 형태를 나타냈다. 이 때, 운점압력은 온도와 계면활성제의 조성이 증가함에 따라 상승함을 확인할 수 있다.

Keywords

References

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