Summary
Samples of spruce wood derived from various stages of organosolv pulping were studied by SEM-EDXA and TEM. During the first stage (methanol-water) the lignin content of the secondary walls decreased slowly, whereas in the compound middle lamellae only the reactivity of lignin increased. During the subsequent stage (methanol-NaOH) the delignification proceeded fast in both layers but the residual lignin content in the compound middle lamellae remained higher than in the secondary walls.
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Fengel, D., Wegener, G. & Greune, A. Studies on the delignification of spruce wood by organosolv pulping using SEM-EDXA and TEM. Wood Sci. Technol. 23, 123–130 (1989). https://doi.org/10.1007/BF00350934
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DOI: https://doi.org/10.1007/BF00350934