Secondary reactions of lignin-derived primary tar components

Abstract Secondary reactions of lignin-derived primary tar components were studied with a closed ampoule reactor under the conditions of N 2 /600 °C/40–120 s. The tar fractions from Japanese cedar milled wood lignin and model compounds were characterized with the GPC, 1 H NMR and GC/MS analyses. Changes in the tar composition indicated the following pathways; unsaturated side-chain (>C C o -cresol- and phenol-type aromatic rings. Although the pure catechol-type compounds were stable, these compounds became reactive in the presence of the guaiacol-type compounds. Radical chain reaction through the H-abstraction from the phenolic hydroxyl groups would activate the catechol-type compounds.

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