Glycerol Separation from Biodiesel Byproduct

바이오디젤 부산물로부터 글리세롤의 분리

  • Yang, Young-Mi (Division of Advanced Materials, Korea Research Institute of Chemical Technology) ;
  • Kim, Kwang-Je (Division of Advanced Materials, Korea Research Institute of Chemical Technology) ;
  • Lee, Yongtaek (Department of Chemical Engineering, Chungnam National University)
  • 양영미 (한국화학연구원 화학소재연구단) ;
  • 김광제 (한국화학연구원 화학소재연구단) ;
  • 이용택 (충남대학교 바이오응용화학부)
  • Received : 2008.08.27
  • Accepted : 2008.09.27
  • Published : 2008.12.10

Abstract

Pure glycerol could be obtained from a biodiesel byproduct by separation processes including neutralization, precipitation, and distillation. The contents of distilled glycerol through the above separation processes were measured and the results were compared according to experimental conditions such as acid concentration and precipitation temperature. Neutralization processes were carried out in the concentration range of 5~37 wt% hydrochloric acid, 5~95 wt% sulfuric acid, and 5~85 wt% phosphoric acid, respectively. Precipitation temperatures in neutralization were controlled in the range of 293~333 K. Higher values of the distilled glycerol content were obtained due to the salt removal in the pretreatment case of neutralization with 10 wt% sulfuric acid and precipitation of 313 K with 85 wt% phosphoric acid, respectively. The variations of acid concentration and precipitation temperature in pretreatment steps affected to some extent glycerol recovery from the biodiesel byproduct.

Keywords

glycerol;biodiesel;separation;distillation;pretreatment

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