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Título : Supercritical carbon dioxide as solvent in the lipase-catalyzed ethanolysis of fish oil: kinetic study
Autor : Melgosa Gómez, Rodrigo
Sanz Díez, Mª Teresa
García Solaesa, Ángela
Paz Barragán, Esther de
Beltrán Calvo, Sagrario
Lamas, Daniela L.
Publicado en: Journal of CO2 Utilization. 2017, V. 17, p. 170–179
Editorial : Elsevier
Fecha de publicación : ene-2017
Fecha de disponibilidad: ene-2019
ISSN : 2212-9820
DOI: 10.1016/j.jcou.2016.11.011
Resumen : Supercritical carbon dioxide (SC-CO2) has been used as green solvent in the lipase-catalyzed ethanolysis of fish oil by Lipozyme RM IM at mild, non-oxidative conditions and with no solvent residues. The effect of experimental conditions, initial substrate ethanol/oil molar ratio (2–38), pressure (7.5–30 MPa), and temperature (323.15–353.15 K) on equilibrium conversion, reaction rate and oxidative status of the products has been studied. No ethanol inhibition has been observed at high concentrations of ethanol, when putting in contact first the fish oil with the enzyme avoiding direct contact between the biocatalyst and ethanol. Operating pressure affected positively the reaction performance in the range investigated. Visual observation of the phase behaviour of the initial reaction mixture showed an “expanded liquid phase” that helped enhancing reaction rate, and a gas phase. Raising temperature accelerated the reaction up to a limit (343.15 K), observing higher enzyme thermal stability than in other reaction media (313.15 K). However, lipid oxidation increases with temperature. Up to 86 ± 1% FAEE yield has been found at MR = 6:1, 30 MPa and 323.15 K. Kinetic data have been correlated by using a mathematical model based on the elementary reactions of the 3-step transesterification. Kinetic rate constants, apparent activation volumes and energies are reported for the first time for a lipase-catalyzed ethanolysis reaction in SC-CO2.
Palabras clave: Omega 3
Lipase
Ethanolysis
Supercritical carbon dioxide
URI : http://hdl.handle.net/10259/4567
Versión del editor: https://doi.org/10.1016/j.jcou.2016.11.011
Aparece en las colecciones: Artículos BIOIND

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