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Table 1 The conditions used in organosolv (OS) and steam explosion (SE) pretreatment together with the composition of the biomass obtained.
| Biomass extracted with 50% (v/v) ethanol | Biomass extracted with 60% (v/v) ethanol | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Time | 60 min, 182 °C | 103 min, 182 °C | 60 min, 182 °C | |||||||||
| Particle size | 1 mm | 4 mm | 1 mm | 4 mm | 1 mm | 4 mm | ||||||
| H2SO4 (w/v) | 0% | 1% | 0% | 1% | 0% | 1% | 0% | 1% | 0% | 1% | 0% | 1% |
| Birch | ||||||||||||
| Cellulose | 62.2 | 59.6 | 61.4 | 57.6 | 63.7 | 57.8 | 61.4 | 62.4 | 59.0 | 60.7 | 62.1 | 63.8 |
| Hemicellulose | 3.0 | 0.5 | 4.6 | 0.3 | 2.6 | 0.4 | 2.7 | 0.2 | 3.3 | 1.1 | 4.3 | 1.1 |
| Lignin | 16.0 | 24.1 | 14.6 | 21.8 | 17.5 | 25.9 | 15.8 | 23.7 | 16.8 | 15.7 | 13.8 | 16.0 |
| Total (wt%) | 81.2 | 84.1 | 80.6 | 79.8 | 83.8 | 84.2 | 79.9 | 86.3 | 79.0 | 77.5 | 80.2 | 80.9 |
| Spruce | ||||||||||||
| Cellulose | 52.5 | 56.1 | 53.8 | 58.0 | 54.5 | 55.9 | 56.1 | 55.2 | 50.3 | 69.1 | 49.1 | 67.3 |
| Hemicellulose | 5.0 | 2.0 | 6.4 | 2.4 | 5.6 | 3.5 | 7.3 | 2.8 | 13.2 | 1.2 | 14.5 | 2.8 |
| Lignin | 29.9 | 31.7 | 26.3 | 29.8 | 28.4 | 37.8 | 25.8 | 40.9 | 23.7 | 25.0 | 26.0 | 24.2 |
| Total (wt%) | 87.4 | 89.8 | 86.5 | 90.1 | 88.5 | 97.2 | 89.2 | 98.9 | 87.2 | 95.3 | 89.6 | 94.3 |
