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. 2023 Apr;70(2):919-929.
doi: 10.1002/bab.2410. Epub 2022 Oct 24.

Transesterification of castor oil catalyzed by a fermented solid produced by Burkholderia contaminans using a bioreactor coupled with ultrasound irradiation

Michelle Aparecida Coelho Moreira  1 , Robson Carlos Alnoch  1   2 , Luiz Fernando de Lima Luz Junior  3 , Alessandra Machado Baron  4 , David Alexander Mitchell  1   5 , Nadia Krieger  1   6
Affiliations

Transesterification of castor oil catalyzed by a fermented solid produced by Burkholderia contaminans using a bioreactor coupled with ultrasound irradiation

Michelle Aparecida Coelho Moreira et al. Biotechnol Appl Biochem. 2023 Apr.

Abstract

In this work, ultrasound was used to assist the ethanolysis of castor oil in a solvent-free system, catalyzed by a dry fermented solid containing the lipase from Burkholderia contaminans (BCFS). Reactions were done at 45°C. The maximum conversion in Erlenmeyer flasks was 71% in 96 h, using a loading of 9% (mass of BCFS in relation to the mass of triacylglycerols in the castor oil) and a molar ratio of ethanol:oil of 6:1, with addition of ethanol in 12 steps. In a packed-bed reactor containing 12 g of BCFS, the conversions were 78% in 48 h, and 83% in 72 h with an ethanol to oil molar ratio of 3:1 and treatment with an ultrasound probe, with maximum power of 500 W, frequency of 20 kHz, and 75% of the maximum power. These results are promising given that, with an ultrasound assisted bioreactor, a higher conversion in a shorter time was achieved, with a lower ethanol to oil molar ratio than was the case in the Erlenmeyer flasks without ultrasound.

Keywords: biodiesel; castor oil; fermented solids; lipases; packed-bed bioreactor; transesterification.

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References

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