Table 3.
Solid yield, delignification and chemical composition of the four cellulose-rich fractions resulting from various two-stage pretreatments
| Sample | Solid yield (%)a | Delignification | Chemical composition (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Extent (%)b | Selectivity | Glu | Xyl | Ara | Gal | Man | Lignin | ||
| Raw poplar | – | – | – | 48.9 | 14.6 | 0.4 | 0.6 | 2.9 | 27.5 |
| SP2 | – | – | – | 63.6 | 4.9 | 0.0 | 0.1 | 1.2 | 27.4 |
| DES-SP2 | 82.6 | 52.4 | 5.2 | 72.9 | 4.3 | 0.0 | 0.0 | 0.0 | 15.8 |
| Organosolv-SP2 | 66.3 | 63.2 | 4.4 | 75.1 | 2.2 | 0.0 | 0.0 | 2.4 | 15.2 |
| Soda/AQ-SP2 | 72.5 | 54.5 | 4.2 | 70.5 | 2.3 | 0.0 | 0.0 | 2.4 | 17.2 |
| Hydrotrope-SP2 | 84.5 | 40.5 | 4.4 | 69.5 | 3.3 | 0.0 | 0.0 | 2.3 | 19.3 |
–, cannot be determined
a Based on the dry weight of the substrate resulted from steam pretreatment at 190 °C for 9.9 min (SP2)
b Based on the lignin content in SP2 substrate