Repositorio UFRO · Omeka S

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