Effect of Methoxy Substituents on Wet Peroxide Oxidation of Lignin and Lignin Model Compounds: Understanding the Pathway to C4 Dicarboxylic Acids
- Carlos A. Vega-AguilarCarlos A. Vega-AguilarLaboratory of Separation and Reaction Engineering−Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, PortugalCentro de Investigação de Montanha−CIMO, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, PortugalMore by Carlos A. Vega-Aguilar
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- M. Filomena BarreiroM. Filomena BarreiroCentro de Investigação de Montanha−CIMO, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, PortugalMore by M. Filomena Barreiro
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- Alírio E. Rodrigues*Alírio E. Rodrigues*Email: [email protected]Laboratory of Separation and Reaction Engineering−Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, PortugalMore by Alírio E. Rodrigues
Abstract
Lignin depolymerization through peroxide oxidation produces dicarboxylic acids (DCA), especially C4-DCA, like succinic acid. In this work, the effect of methoxy substituents on C4-DCA production using peroxide oxidation of lignin model compounds (p-hydroxybenzoic acid, vanillic acid, and syringic acid) and hardwood and softwood lignin samples was studied. It was concluded that methoxy substituents increased the reactivity toward peroxide oxidation. The succinic acid yield was higher for the model compounds with fewer methoxy groups, achieving 5.8 wt % of succinic acid for p-hydroxybenzoic acid. For Eucalyptus globulus kraft lignin (hardwood lignin with guaiacyl and syringyl units), an increased reactivity was verified, and more succinic acid (3.5 wt %) was produced in a shorter time, comparatively with Indulin AT lignin (softwood lignin, with only guaiacyl units), which produced 2.7 wt %. This evidence suggests that E. globulus kraft lignin might be a better raw material than Indulin AT for succinic acid production by peroxide oxidation.
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