Lignocellulosic biomass represents the most attractive sustainable and renewable resource. About 20-30% of lignocellulosics consists of lignin, the most abundant source of renewable aromatics in polymeric form. Industrially, lignin is obtained as a by-product from the conversion of wood to chemical pulp. Nowadays, most of it is just burn as a fuel to supply part of the energy demand of the pulp mill. However, lignin has a huge potential as a substrate for the production of more high value application such as biomaterials and functional biopolymers. Recent progress in retrieving kraft lignin from the black liquor has opened possibilities for the use of such technical lignins to produce valuable bio-based products. Nevertheless, the major issue to be addressed is the structural- and size heterogeneity. Herein, we report our strategy intended to refine lignin by sustainable and sequential solvents extraction. Advanced characterization techniques are needed to successfully unravel structural insights of the refined fractions. Insights at the molecular scale have been carried out by both 2D NMR (DEPT-Edited HSQC, TOCSY, HMBC) and 1D NMR (APT-, DEPT-<sup>13</sup>C) while functionalities were quantified by <sup>31</sup>P-NMR. Using these techniques, we identify a new linkage type that can be associated with radical coupling reactions in lignin.

Unravelling insights on kraft lignin structure and composition

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.