Resumen: 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. Idioma: Inglés DOI: 10.1016/j.jclepro.2018.07.260 Año: 2018 Publicado en: JOURNAL OF CLEANER PRODUCTION 202 (2018), 81-87 ISSN: 0959-6526 Factor impacto JCR: 6.395 (2018) Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 8 / 52 = 0.154 (2018) - Q1 - T1 Categ. JCR: GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY rank: 6 / 35 = 0.171 (2018) - Q1 - T1 Categ. JCR: ENVIRONMENTAL SCIENCES rank: 18 / 250 = 0.072 (2018) - Q1 - T1 Factor impacto SCIMAGO: 1.62 - Environmental Science (miscellaneous) (Q1) - Strategy and Management (Q1) - Renewable Energy, Sustainability and the Environment (Q1) - Industrial and Manufacturing Engineering (Q1)