RT Journal Article
T1 Acidic depolymerization vs ionic liquid solubilization in lignin extraction from eucalyptus wood using the protic ionic liquid 1-methylimidazolium chloride
A1 Ovejero Pérez, Antonio
A1 Rigual Hernández, Victoria De Los Ángeles
A1 Domínguez Toribio, Juan Carlos
A1 Alonso Rubio, María Virginia
A1 Oliet Pala, María Mercedes
A1 Rodríguez Somolinos, Francisco
AB Protic ionic liquids have been proposed as effective solvents for the selective extraction of lignin from wood. In this work, the protic ionic liquid 1-methylimidazolium chloride has been used to extract lignin at different biomass loadings, temperatures, and times to understand the influence of treatment severity on the lignin dissolution mechanism. Themaximumlignin recovery (82.35 g lignin/100 g biomass lignin) was achieved at 10% (w/w) biomass loading, 135 °C, and 6 h. An increase in treatment severity leads to an acid cleavage of ether linkages, which increases the average molecular weight and thermal stability of lignins due to C-C repolymerization. HSQC-NMR analysis showed the effect of operating conditions on the predominant mechanismof lignin depolymerization. Atmild conditions, there is a preferential degradation of G units (the typical depolymerization mechanism of ionic liquid treatments); but at the most severe conditions, S units are predominantly removed, as usually occurs in acidic treatments. This work contributes to better understanding the different lignin extraction mechanisms occurring with a protic ionic liquid depending on different operating conditions.
SN 0141-8130
YR 2020
FD 2020
LK https://hdl.handle.net/20.500.14352/94081
UL https://hdl.handle.net/20.500.14352/94081
LA eng
NO Ovejero-Pérez, Antonio, et al. «Acidic Depolymerization vs Ionic Liquid Solubilization in Lignin Extraction from Eucalyptus Wood Using the Protic Ionic Liquid 1-Methylimidazolium Chloride». International Journal of Biological Macromolecules, vol. 157, agosto de 2020, pp. 461-69. DOI.org (Crossref), https://doi.org/10.1016/j.ijbiomac.2020.04.194.
DS Docta Complutense
RD 15 sept 2024