Microwave-assisted epoxidized oil production from the wet microalga Nannochloropsis gaditana to obtain environmentally friendly epoxy resins

Primer Autor
Hidalgo, Pamela
Co-autores
Echeverria, Ana
Romero, Luis
Navia, Rodrigo
Hunter, Renato
Título
Microwave-assisted epoxidized oil production from the wet microalga Nannochloropsis gaditana to obtain environmentally friendly epoxy resins
Editorial
ELSEVIER SCIENCE SA
Revista
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
Lenguaje
en
Resumen
Epoxidized oils are widely used in the polymer industry to obtain biodegradable, environmentally friendly epoxy resins. This work examines solvent extraction and oil epoxidation from a wet paste of the microalga Nanno-chloropsis gaditana using microwave technology. An appropriate extraction solvent containing a mixture of a polar and a nonpolar solvent was selected. The results reveal that a chloroform/methanol ratio of 1:1 (v/v) promotes the high selectivity of unsaturated fatty acids of the oils for epoxidation. A central composite design was used to optimize the yield of epoxidized oils. The conditions that maximized the oxirane oxygen yield to 82.43% were as follows: temperature of 95 degrees C, catalyst dosage 0.25% wt, and heptane/oil mass ratio 3:4, using a formic acid/hydrogen peroxide 0.3:1.1 molar ratio. The epoxidation kinetics of microalgal oils and a mathematical model were developed. Using the least-squares method to fit the experimental data, the epoxidation rate constant found was on the order of 10-4 L mol-1 s-1 and the activation energy of 15.62 kJ/mol. Finally, the process presented some advantages due to the elimination of the drying step and the decrease in both reaction time and solvent dosage used during extraction and epoxidation.
Fecha Publicación
2023
Tipo de Recurso
artículo original
doi
10.1016/j.cep.2022.109215
Formato Recurso
PDF
Palabras Claves
Microalgal oils
Epoxidized oils
Microwave-assisted heating
Epoxidation kinetics
Ubicación del archivo
http://dx.doi.org/10.1016/j.cep.2022.109215
Categoría OCDE
Energía y Combustibles
Ingeniería
Materias
Aceites de microalgas
Aceites epoxidados
Calentamiento asistido por microondas
Cinética de epoxidación
Identificador del recurso (Mandatado-único)
artículo original
Versión del recurso (Recomendado-único)
versión publicada
Derechos de acceso
metadata
Access Rights
metadata
Id de Web of Science
WOS:000904465700006
ISSN
0255-2701
Tipo de ruta
hibrida
Categoría WOS
Energía y Combustibles
Ingeniería
Referencia del Financiador (Mandatado si es aplicable-repetible)
ANID FONDECYT 412-4438
UCT FONDEF VIU 15E0087
ANID FONDECYT 3160762
ANID GAMBIO ACT172128
Colecciones
Colección Publicaciones Científicas
Colección ANID
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