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Título
Kraft lignin depolymerisation in sub- and supercritical water using ultrafast continuous reactors. Optimization and reaction kinetics
Año del Documento
2020
Editorial
Elsevier
Descripción
Producción Científica
Documento Fuente
Journal of Supercritical Fluids, 2020, vol. 165, p. 104940
Abstract
Kraft lignin was rapidly depolymerised in a continuous reactor using sub- and supercritical water. The reaction yielded an aromatic oil rich in high value aromatic monomers such as guaiacol, vanillin, acetovanillone and homovanillic acid. Different temperatures between 300 and 400 °C and reaction times from 60 ms were studied. An increment in reaction time at every temperature studied promoted secondary reactions of repolymerisation of the lignin products. Those undesired reactions were more relevant as temperature increased. An optimal temperature of 386 °C at a reaction time of 170 ms was found, with a maximum yield in phenolic compounds obtained. At those conditions, a bio-oil containing low molecular weight compounds was obtained with a yield of 44.6 %. A selectivity to the four cited monomers of 9.9 % was achieved, with little formation of solid residue (3.5 %). A simple kinetic model was proposed to describe the yield for the different fractions and fitted to experimental data.
Materias Unesco
23 Química
Palabras Clave
Despolimerización de lignina
Lignin depolymerisation
Bioaceite aromático
Aromatic bio-oil
ISSN
0896-8446
Revisión por pares
SI
Patrocinador
Ministerio de Economía y Competitividad y Comisión Europea (FEDER) Proyecto (CTQ201679777-R)
Ministerio de Educación (beca predoctoral FPU15 / 00409)
Ministerio de Educación (beca predoctoral FPU15 / 00409)
Version del Editor
Propietario de los Derechos
© 2020 Elsevier
Idioma
eng
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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