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Título
Understanding sulfonated kraft lignin re-polymerization by ultrafast reactions in supercritical water
Año del Documento
2022
Editorial
Elsevier
Descripción
Producción Científica
Documento Fuente
The Journal of Supercritical Fluids, Volume 191, 2022, 105768
Abstract
Re-polymerization reactions are a commonly reported issue on the way to the higher recovery of monomers from lignin. The reactivity of monomers obtained from lignin depolymerization and their contribution to the re-polymerization in supercritical water (SCW) was investigated. Sulfonated Kraft lignin (SKL) was used along with four monomers: vanillin, vanillic acid, vanillyl alcohol and acetovanillone. Indulin Kraft lignin was also employed as the reference to understand the re-polymerization of SKL in SCW. The formation of diarylmethane structures was detected in HSQC spectra of solid residue after the SCW process. Lignin released fragments with free phenolic β-O-4 structures, as well as the monomeric product vanillyl alcohol are involved with the formation of o-o´ and o-p´ diarylmethane structures. Chemical structure of Kraft lignin and its polymeric product after the SCW process was remarkably similar, as shown by HSQC, indicating that re-polymerization reactions occur through cross-linking polymerization, mainly in their fractions of low molecular weight products.
Palabras Clave
Diarylmethanes
Diarilmetano
Vanillin
Vanilina
Supercritical water
Agua supercrítica
ISSN
0896-8446
Revisión por pares
SI
Patrocinador
Ministerio de Ciencia, Innovación y Universidades - Fondo Europeo de Desarrollo Regional (projects CTQ2016-79777-R and PID2019-105975GB-I00)
Junta de Castilla y León (project CLU-2019-04 T)
Junta de Castilla y León (project CLU-2019-04 T)
Propietario de los Derechos
© 2022 The Authors
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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