New insights into the base catalyzed depolymerization of technical lignins: a systematic comparison
Rajeesh Kumar Pazhavelikkakath Purushothaman, Gijs van Erven, Daan S. van Es, Léon Rohrbach, Augustinus E. Frissen, Jacco van Haveren, R.J.A. Gosselink
Abstract
P NMR and SEC analyses confirm that the BCD residues are indeed more condensed, with increased phenolic hydroxyl content and lower molecular weights compared to all feed lignins. Subsequent BCD of solid residual fractions produced only low oil yields (6-9% w/w) with lower phenolic monomer yields (4% w/w) compared to original lignin, confirming the significantly more recalcitrant structure. Our study improves the overall understanding of the BCD process, highlights important feedstock-dependent outcomes and ultimately contributes to the complete valorization of BCD-derived lignin streams.
Topics & Concepts
LigninDepolymerizationOrganosolvChemistryOrganic chemistryGuaiacolResidue (chemistry)MonomerCharPhenolsSoftwoodCatalysisPolymerMaterials sciencePyrolysisComposite materialLignin and Wood ChemistryFermentation and Sensory AnalysisBiochemical and biochemical processes