Publication: Sustainable Biocatalytic Procedure for Obtaining New Branched Acid Esters
Authors
Montiel, M.C. ; Asensi, M. ; Gimeno-Martos, S. ; Máximo, F. ; Bastida, J.
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Publisher
MDPI
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DOI
https://doi.org/10.3390/ma14226847
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info:eu-repo/semantics/article
Description
©<2021>. This manuscript version is made available under the CC-BY license http://creativecommons.org/licenses/by/4.0/
This document is the Published version of a Published Work that appeared in final form in [Materials]. To access the final edited and published work see [https://doi.org/10.3390/ma14226847]
Abstract
Biocatalytic synthesis of 2-ethylhexyl 2-methylhexanoate is described in this work for the
first time. This branched-chain ester is suitable for use at low temperatures in numerous applications.
The immobilized lipase Novozym® 435 has demonstrated its ability to catalyze the ester synthesis
from 2-ethylhexanol and 2-methylhexanoic acid in a solvent-free medium. The high reaction times
that are required result in a loss of alcohol by evaporation, which must be compensated for with
an excess of this substrate if high conversions are to be achieved. Therefore, two strategies are
established: 70 ◦C with a 10% excess of alcohol, which requires a longer operating time and provides
conversions of 97%, and 80 ◦C with a 20% excess of alcohol, which allows for the achievement of
a 99% conversion in a shorter time. The optimal reaction conditions have been chosen based on
reusability of the enzyme, process productivity, green metrics and preliminary economic study. When
the synthesis is carried out under the best conditions (70 ◦C, 10% molar excess of alcohol and six
uses of the immobilized enzyme) a productivity of 203.84 kg product × kg biocatalyst−1
is attained.
The biocatalytic procedure matches many of the objectives of “green chemistry” and is suitable to be
scaled up and used in industrial manufacturing
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Citation
Materials 2021, 14(22), 6847
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