Clean enzymatic preparation of oxygenated biofuels from vegetable and waste cooking oils by using spongelike ionic liquids technology
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http://dx.doi.org/10.1021/acssuschemeng.6b01570 |
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Títol
Clean enzymatic preparation of oxygenated biofuels from vegetable and waste cooking oils by using spongelike ionic liquids technologyAutoria
Data de publicació
2016Editor
American Chemical SocietyISSN
2168-0485Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/acssuschemeng.6b01570Paraules clau / Matèries
Resum
The biocatalytic synthesis of oxygenated biofuels
(fatty acid solketal esters, FASEs) and biodiesel (fatty acid
methyl esters, FAMEs) was carried out by both the direct
esterification of fatty acids (i.e., lauric, ... [+]
The biocatalytic synthesis of oxygenated biofuels
(fatty acid solketal esters, FASEs) and biodiesel (fatty acid
methyl esters, FAMEs) was carried out by both the direct
esterification of fatty acids (i.e., lauric, myristic, palmitic, and
oleic acids, respectively) with solketal or methanol, and the
transesterification of vegetable oils (i.e. sunflower, olive,
cottonseeds, and waste cooking oil) with the same alcohols,
in hydrophobic ionic liquids (ILs) based on cations with long
alkyl side-chains (e.g., octadecyltrimethylammonium bis-
(trifluoromethylsulfonyl)imide [C18tma][NTf2]). These hydrophobic
ILs are temperature switchable ionic liquid/solid phases
that behave as sponge-like system. As liquid phases, they are
excellent monophasic reaction media for proposed biotransformations
with all the assayed fat substrates, e.g. near to 100%
yield of fatty acids solketyl esters (FASEs) and fatty acid methyl esters (FAMEs) in 6 h at 60 °C. By using waste cooking oil
mixed with free fatty acids as substrate, green biofuels containing either both FAMEs and FASEs (e.g., aprox. 80% FAMEs and
20% FASEs, etc.) can easily be prepared. Moreover, the reaction mixture can be easily fractionated by iterative centrifugations at
controlled temperature into three phases, i.e. solid IL, water, and FAMEs + FASEs mixture leading to a straightforward and clean
approach allowing the full recovery of the biocatalyst/IL system for further reuse and the simple product isolation. Furthermore,
the enzyme did not shown any loss in activity during reuse in these reaction systems after six operation cycles. [-]
Publicat a
ACS Sustainable Chem. Eng. 2016, 4, 6125−6132Drets d'accés
© 2016 American Chemical Society
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