RT Journal Article
T1 Capacity of Aqueous Solutions of the Ionic Liquid 1-Ethyl-3-methylimidazolium Acetate to Partially Depolymerize Lignin at Ambient Temperature and Pressure
A1 Pena, Carlos A.
A1 Rodil Rodríguez, Eva
A1 Rodríguez Martínez, Héctor
K1 Indulin AT
K1 Ionic liquid
K1 2D-NMR
K1 Nanoparticles
K1 Vanillin
K1 Guaiacol
AB Lignin is a very attractive and abundant biopolymer with the potential to be a biorenewable source of a large number of value-added organic chemicals. The current state-of-the-art methods fail to provide efficient valorization of lignin in this regard without the involvement of harsh conditions and auxiliary substances that compromise the overall sustainability of the proposed processes. Making an original approach from the set of mildest temperature and pressure conditions, this work identifies and explores the capacity of an aqueous solution of the nonvolatile ionic liquid 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) to partially depolymerize technical lignin (Indulin AT) by means of a treatment consisting in the simple contact at ambient temperature and pressure. Among a considerable number of valuable phenolic molecules that were identified in the resulting fluid, vanillin (yield of about 3 g/kg) and guaiacol (yield of about 1 g/kg) were the monophenolic compounds obtained in a higher concentration. The properties of the post-treatment solids recovered remain similar to those of the original lignin, although with a relatively lower abundance of guaiacyl units (in agreement with the generation of guaiacyl-derived phenolic molecules, such as vanillin and guaiacol). The assistance of the treatment with UV irradiation in the presence of nanoparticle catalysts does not lead to an improvement in the yields of phenolic compounds.
PB American Chemical Society
SN 0021-8561
YR 2024
FD 2024
LK http://hdl.handle.net/10347/33078
UL http://hdl.handle.net/10347/33078
LA eng
NO Journal of Agricultural and Food Chemistry, 2024, 72(2), 1136-1145
NO This work was supported by Xunta de Galicia (project ED431B 2020/21, cofunded by the European Regional Development Fund). The use of RIAIDT-USC analytical facilities is also acknowledged.
DS Minerva
RD 22 abr 2026