Oil removal from spent bleaching earth of vegetable oil refinery plant using supercritical carbon dioxide

Siti Machmudah*, Nabil Apta Maulana, Andhika Shafian Maindo Norman, Valencia Marchilia Nyoto, Irji Amrullah, Wahyudiono, Sugeng Winardi, I. Gede Wenten, Motonobu Goto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The oil in the spent bleaching earth (SBE) matrix was successfully removed by applying the supercritical carbon dioxide (SCCO2) extraction technique in a semi-continuous flow–type system. The SCCO2 extraction process was conducted at 40–80 °C and 20–30 MPa with extraction time of ∼180 min. The color of SBE matrix changes from the dark to dark-pale color after the SCCO2 extraction treatment exhibiting the substances including oil in the SBE matrix were successfully removed. The extracted oil yield was around 95% when the SCCO2 extraction process was performed at 40 °C and 30 MPa with 10% ethanol addition as a co–solvent. The GC analysis showed that the prominent fatty acid constituents in the extracted oil are palmitic and oleic acids, furthermore it can be fed as a feedstock to produce biodiesel fuel. Next, it can be proposed that SCCO2 extraction system is a viable way to extract oil from the SBE matrix.

Original languageEnglish
Article numbere10826
JournalHeliyon
Volume8
Issue number10
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Extraction
  • Oil recovery
  • Spent bleaching earth
  • Supercritical CO
  • Vegetable oil

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