Official Journal of the Japan Wood Research Society
Table 1 The yields of fractionated product and lignin-derived product, and lignin concentration in water-soluble portion, precipitate and water-insoluble residue in the 1st and 2nd stages, as Japanese cedar treated by two-step semi-flow hot-compressed water
Stage | Fraction | Yield of fractionated product (wood-based wt%) | Yield of lignin-derived product (wood-based wt%) | Lignin concentrationa (g/g) |
|---|---|---|---|---|
1st stage | Water-soluble portion | 47.1 | 10.1 | 0.214 |
Precipitate | 5.0 | 3.9 | 0.780 | |
Water-insoluble residue | 47.9 | 18.0 | 0.376 | |
2nd stage | Water-soluble portion | 29.8 | 5.0 | 0.168 |
Precipitate | 5.3 | 1.8 | 0.340 | |
Water-insoluble residue | 12.8 | 11.2 | 0.875 | |
Total | 100 | 32.0 | – |