Table 1 Chemical compositions of poplar after AC pretreatment at 170 °C, expressed as percentage of dry mass (DM)
AC concentration | Treatment time (min) | Severity factor | Glucan (%) | Xylan (%) | Acid insoluble lignin (%) | Acid soluble lignin (%) | Solids recovery (%) | Removal | ||
|---|---|---|---|---|---|---|---|---|---|---|
Glucan (%) | Xylan (%) | Lignin (%) | ||||||||
Raw |  | – | 43.4 ± 0.0 | 17.4 ± 0.2 | 24.4 ± 0.3 | 3.5 ± 0.3 | – | – | – | – |
0% | 10 | 3.1 | 43.9 ± 0.1 | 16.5 ± 0.5 | 25.1 ± 0.0 | 3.4 ± 0.3 | 98.1 | 0.8 | 6.8 | 0.3 |
5% | 10 | 3.1 | 46.9 ± 0.9 | 14.8 ± 0.2 | 27.1 ± 0.3 | 3.0 ± 0.3 | 90.5 | 2.2 | 23.0 | 2.5 |
10% | 10 | 3.1 | 52.3 ± 0.1 | 12.9 ± 0.1 | 29.9 ± 0.2 | 2.6 ± 0.3 | 80.7 | 2.7 | 40.2 | 6.0 |
0% | 30 | 3.5 | 49.1 ± 0.0 | 11.0 ± 0.2 | 28.7 ± 0.1 | 2.7 ± 0.3 | 85.9 | 2.8 | 45.5 | 3.4 |
5% | 30 | 3.5 | 54.9 ± 0.4 | 6.7 ± 0.5 | 33.4 ± 0.5 | 2.2 ± 0.3 | 74.7 | 5.5 | 71.3 | 4.9 |
10% | 30 | 3.5 | 58.7 ± 0.6 | 5.1 ± 0.4 | 34.6 ± 0.1 | 2.0 ± 0.3 | 69.5 | 5.9 | 79.6 | 9.2 |
0% | 50 | 3.8 | 53.6 ± 0.3 | 8.4 ± 0.4 | 32.6 ± 0.1 | 2.3 ± 0.3 | 77.0 | 4.8 | 62.8 | 3.7 |
5% | 50 | 3.8 | 58.8 ± 0.2 | 4.3 ± 0.4 | 36.1 ± 0.1 | 2.0 ± 0.3 | 68.8 | 6.7 | 82.8 | 6.1 |
10% | 50 | 3.8 | 57.6 ± 0.1 | 3.2 ± 0.2 | 35.6 ± 0.1 | 1.9 ± 0.3 | 65.6 | 12.9 | 87.8 | 12.0 |