Bio-lubricants production from fish oil residue by transesterification with trimethylolpropane

The fatty acid ethyl esters mixture, a fish oil residue obtained after the extraction of omega-3 polyunsaturated fatty esters, has been converted into mixtures of mono-, di-, and triesters of trimethylolpropane by transesterification at 100-140 °C under vacuum with sodium ethoxide as catalyst. This...

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Bibliographic Details
Published in:Journal of cleaner production 2018-11, Vol.202, p.81-87
Main Authors: Angulo, Beatriz, Fraile, José M., Gil, Laura, Herrerías, Clara I.
Format: Article
Language:English
Subjects:
Bio-lubricants
Transesterification
Trimethylolpropane
Waste fish oil
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Summary:The fatty acid ethyl esters mixture, a fish oil residue obtained after the extraction of omega-3 polyunsaturated fatty esters, has been converted into mixtures of mono-, di-, and triesters of trimethylolpropane by transesterification at 100-140 °C under vacuum with sodium ethoxide as catalyst. This method has shown to be more efficient than the enzymatic transesterification using commercially available lipases. The crude reaction mixture (84% conversion of ethyl esters), enriched in trimethylolpropane triesters (96% selectivity) was characterized and its properties compared with those of the starting ethyl esters mixture and the trimethylolpropane esters obtained from vegetal sources. •Waste fish oil fatty esters of trimethylolpropane have been prepared.•Common lipases are not efficient for this transesterification.•Sodium ethoxide allows obtaining trimethylolpropane esters.•Selectivity can be tuned with the reaction conditions.•Trimethylolpropane triesters show interesting physical properties as bio-lubricants.
ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2018.07.260