RT info:eu-repo/semantics/article
T1 Understanding sulfonated kraft lignin re-polymerization by ultrafast reactions in supercritical water
A1 Adamovic, Tijana
A1 Zhu, Xuhai
A1 Pérez, Eduardo
A1 Balakshin, Mikhail
A1 Cocero Alonso, María José
K1 Diarylmethanes
K1 Diarilmetano
K1 Vanillin
K1 Vanilina
K1 Supercritical water
K1 Agua supercrítica
AB 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.
PB Elsevier
SN 0896-8446
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/55973
UL https://uvadoc.uva.es/handle/10324/55973
LA eng
NO The Journal of Supercritical Fluids, Volume 191, 2022, 105768
NO Producción Científica
DS UVaDOC
RD 27-dic-2024