Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Esterification of Free Fatty Acids by Strong Acidic Ionic Liquids

강산성 이온성 액체에 의한 유리지방산의 에스테르화 연구

  • Kim, Young-Joo (Bioenergy Research Center, Korea Institute of Energy Research) ;
  • Lee, Jin-Suk (Bioenergy Research Center, Korea Institute of Energy Research) ;
  • Kim, Deog-Keun (Bioenergy Research Center, Korea Institute of Energy Research) ;
  • Rhee, Young-Woo (Department of Chemical Engineering, Chungnam National University) ;
  • Han, Jeong-Sik (Agency for Defence Development)
  • 김영주 (한국에너지기술연구원 바이오에너지센터) ;
  • 이진석 (한국에너지기술연구원 바이오에너지센터) ;
  • 김덕근 (한국에너지기술연구원 바이오에너지센터) ;
  • 이영우 (충남대학교 화학공학과) ;
  • 한정식 (국방과학연구소)
  • Received : 2006.09.24
  • Accepted : 2007.01.11
  • Published : 2007.06.30
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Abstract

The esterification efficiency of several ionic liquids has been investigated to determine the feasibility for the conversion of free fatty acids to alkylester. Five ionic liquid catalysts having strong acidity, BPC[$AlCl_3$], BMIM[$Bf_4$], BMIM[$Pf_6$], EMIM[$Ntf_2$], BMIM[Otf], have been employed in this work. BPC[$AlCl_3$] has the highest esterification efficiency among the ionic liquid catalysts. Over 90% conversion efficiency has been achieved in the esterification of the simulated used cooking oil by BPC[$AlCl_3$] with two hours reaction time. Since BPC[$AlCl_3$] has several advantages such as high esterification activity, ease of separation from reaction mixture and reusability after treatment procedure, it will be a promising catalyst for the conversion of free fatty acids to esters in waste fats.

청정 용매로 주목받고 있는 이온성 액체를 촉매로 유리지방산을 에스테르화하여 알킬에스터로 전환하는 반응 특성에 대해 조사하였다. 본 연구에서 사용한 강산성 이온성 촉매는 BPC[$AlCl_3$], BMIM[$Bf_4$], BMIM[$Pf_6$], EMIM[$Ntf_2$], BMIM[Otf] 등 5종이었으며 이러한 이온성 액체 촉매 중 BPC[$AlCl_3$]가 본 반응에서 가장 높은 활성을 갖는 것으로 나타났다. BPC[$AlCl_3$]는 모사 폐식용유를 원료로 한 에스테르화 반응 시 원료에 포함된 유리지방산의 90% 이상을 반응시작 2시간 내에 에스테르로 전환시키는 것으로 나타났다. 이러한 높은 반응 효율과 반응 후 촉매의 회수의 용이성 및 처리 후 재사용이 가능하다는 장점을 고려할 때 BPC[$AlCl_3$]를 이용하여 유리지방산이 다량 함유된 폐유지의 전처리 촉매로 활용 가능성이 높은 것으로 나타났다.

Keywords

References

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