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            <title xml:lang="en">Lignin conversion to OH-enriched oligomers</title>
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                <title xml:lang="en">Lignin conversion to OH-enriched oligomers</title>
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                  <date type="start">2025-09-14</date>
                  <date type="end">2025-09-19</date>
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              <p>Reducing our dependency towards fossil ressources is one of the biggest challenges of the next decades. Lignin as the most abundant renewable aromatics feedstock, can be a promising resource of biobased chemicals. One way to valorize technical lignins from pulp industries or cellulosic biorefinery entirely is in applications like polymerization as a polyol for the production of polyurethane or other polymer [1]. However, its low reactivity linked to low hydroxyl content, condensed units and high versatility in structure hinders its intensive utilization. Increasing the hydroxyl content by cleavage of ether inter-units bonds and abundant methoxy groups can increase lignin reactivity and decrease its polydispersity index (PDI) [2]. Both reactions being based on the cleavage of an aryl alkyl ether bond, the development of a one-step process to demethylate and partially depolymerize lignin might be an interesting approach. We will present here two approaches (Fig 1) to reach OH-enriched oligomers from two technical lignins, by hydrogenolysis and hydrothermal reactions. The conversion of lignin in the presence of some of the screened heterogeneous catalysts, especially CoMoS/Al2O3 under hydrogenolysis operating conditions, showed a significant increase in hydroxyls content, including a large increase of catechol groups. However, after separation of the light and heavy fractions, we observed that only the light fraction showed a considerable increase in OH groups [3]. In hydrothermal operating conditions, the catechol moieties of depolymerized lignin show an even higher increase, proving that demethylation is achieved in a large extent. The depolymerized lignin does not present β-O-4 IUB anymore, however C-C bonds (β-5, β- β, β-1 and 5-5) are partially preserved. The overall decrease of IUB results in a decrease of the molecular mass, indeed observed in GPC analysis. Finally, optimization of operating conditions (T, P, medium) allowed to greatly enhance demethylation and resulted in a fraction having 2.3-fold increase in phenolics OH concentration.</p>
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