Evaluation of the optimal reaction conditions for the methanolysis and ethanolysis of castor oil catalyzed by immobilized enzymes

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  • T. A. Andrade
  • I. F. Al-Kabalawi
  • ,
  • M. Errico
  • ,
  • K. V. Christensen, University of Southern Denmark, Denmark
© 2018 ETA-Florence Renewable Energies. As an alternative to the use of chemical catalysts, immobilized enzyme Lipozyme 435 was evaluated as catalyst for biodiesel production, comparing its efficiency in the castor oil transesterification with methanol and ethanol. Different reaction conditions were assessed and optimized, including the reaction temperature (35 - 60 °C), alcohol-to-oil molar ratio (from 3:1 to 6:1), amount of catalyst (from 3 to 15 wt% by weight of oil), addition of water (0 - 15 wt%), and use of n-hexane as a solvent (0 - 75 wt%). For the transesterification with methanol, the optimal reaction conditions were 3:1 methanol-to-oil molar ratio, 5 wt% of enzymes, 7.5 wt% of water, 50 wt% n-hexane, at 50 °C. The fatty acid methyl esters content was 96.8 % and 1.0 % FFA. Regarding the reactions with ethanol, 98.0 % fatty acid ethyl ester was obtained and 1.3 % FFA, when the reaction was carried out at 60 °C, 4:1 ethanol-to-oil molar ratio, 5 wt% of enzymes, 40 wt% of n-hexane and no addition of water.
Original languageEnglish
JournalEuropean Biomass Conference and Exhibition Proceedings
Pages (from-to)1044-1050
Number of pages7
Publication statusPublished - 1 May 2018
Externally publishedYes

    Research areas

  • Biodiesel, Castor oil, Enzymatic process, Transesterification

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