Studies on the Recovery of Triglyceride from Used Shortening by Supercritical Fluid Extraction

초임계유체 추출에 의한 폐식용유의 재활용에 대한 기초연구

  • Han, Byung-Seok (Division of Chemical Engineering & Biotechnology, Ajou University) ;
  • Yoon, Jung-Ro (Department of Food Science, Kangnung National University) ;
  • Kwon, Young-An (Department of Food Science and Technology, Woosuk University) ;
  • Jung, Mun-Yhung (Department of Food Science and Technology, Woosuk University) ;
  • Kim, Kong-Hwan (Division of Chemical Engineering & Biotechnology, Ajou University)
  • 한병석 (아주대학교 화학생물공학부) ;
  • 윤정로 (강릉대학교 식품과학과) ;
  • 권영안 (우석대학교 식품공학과) ;
  • 정문웅 (우석대학교 식품공학과) ;
  • 김공환 (아주대학교 화학생물공학부)
  • Published : 1999.10.31


Supercritical fluid extraction was applied to recycling triglyceride from used shortening. Used shortening and its fractions were analyzed with high performance size exclusion chromatography for their composition in triglycerides, polymer and low molecular weight compounds. Conjugated diene value and color of the fractions were also measured with a UV spectrophotometer and a colorimeter, respectively. Pressure and temperature ranges employed were $15{\sim}30$ MPa and $40{\sim}60^{\circ}C$, respectively. Concentration of fat in supercritical (SC) $CO_2$ ranged from $0.3\;X\;10^{-3}{\sim}7.4\;X10^{-3}(g\;fat/g\;CO_2)$. An exponential relation between concentration of fat in SC $CO_2$ and density was observed. Color of the extracts was light yellow which was very close to that of the fresh shortening. Low molecular weight compounds were preferentially concentrated in the initial fraction, while polymer was extracted in the final fraction. Conjugated diene value of the initial fractions was clearly lower than that of feed. It increased sharply as the polymer content in the fraction became significantly large.