Authors have been researched about the physical characteristics of solid residue in Hot-Compressed Water (HCW) treatment, and it was cleared that hemi-cellulose was decomposed in HCW treatment at 453 K and decomposition reaction progressed from not only the particle surface, but also the inner particle. For further study, the lignin content and the FT-IR spectrum of the solid residue were measured. The results indicate that HCW treatment at 453 K didn't destruct cellulose crystalline structure and didn't decompose lignin component.
