2024-03-28T21:03:20Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/345212022-06-28T11:38:17Zcom_10324_31661com_10324_952com_10324_894col_10324_31662
Aromatics from Lignin through Ultrafast Reactions in Water
Abad Fernández, Nerea
Pérez Velilla, Eduardo
Cocero Alonso, María José
Producción Científica
Nowadays, the valorization of lignin, the major natural source of aromatics in earth, is being a challenge for the scientific community. In this study, kraft lignin is effectively converted into aromatic monomers by ultrafast depolymerization in hot and pressurized water. At reaction times below 500 ms, it is possible to avoid char formation originated from undesirable condensation reactions by controlling accurately the reaction time. Under alkaline medium, the reaction reaches an optimum point at 386ºC and 300 ms with a light oil yield of 60% with a concentration in key compounds such as guaiacol, creosol, vanillin and acetovanillone of around 20 %w/w. The char formation in this point was surprisingly low (4 %w/w). Analysis and quantification of the products allows to identify the evolution of the different reaction steps and propose plausible mechanism for the depolymerization and repolymerization stages. Furthermore, it is proven that the proposed technology is equally effective to treat directly industrial black liquors with a yield higher than 50% to light oil, containing as main monomers guaiacol (2.7%), syringol (3.0%) and syringaldehyde (7.3%).
2019-02-15
2019
info:eu-repo/semantics/article
Green Chemistry 2019 (Accepted Manuscript)
1463-9262
http://uvadoc.uva.es/handle/10324/34521
https://doi.org/10.1039/C8GC03989E
Green Chemistry
eng
https://pubs.rsc.org/en/content/articlelanding/2019/gc/c8gc03989e
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 International
Royal Society of Chemistry