Table 1 Chemical composition and mass balance for sugarcane bagasse components before and after pretreatment via an alkaline-sulfite chemithermomechanical process or chlorite delignification
Sample | Chemical composition of samplesa (g/100 g of pretreated sample) | Solids yield (%) | Mass balance (g/100 g of original sugarcane bagasse) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Ligninb | Glucan | Hemicellulose | Lignin | Glucan | Hemicellulose | ||||||
Xylan | Arabinosyl | Acetyl | Xylan | Arabinosyl | Acetyl | ||||||
Untreated | 22.4 ± 0.6 | 40.0 ± 0.1 | 21.4 ± 0.1 | 2.0 ± 0.1 | 3.6 ± 0.1 | 100 | 22.4 | 40.0 | 21.4 | 2.0 | 3.6 |
2.5% Na2SO3 + 1.25% NaOH | 24.8 ± 0.3 | 42.3 ± 0.5 | 20.4 ± 0.2 | 1.8 ± 0.1 | 1.4 ± 0.3 | 86.8 | 21.5 | 36.7 | 17.7 | 1.6 | 1.2 |
5% Na2SO3 + 2.5% NaOH | 23.7 ± 0.3 | 44.0 ± 0.2 | 19.6 ± 0.1 | 1.9 ± 0.1 | 1.1 ± 0.2 | 84.1 | 19.9 | 37.0 | 16.5 | 1.6 | 0.9 |
10% Na2SO3 + 5% NaOH | 16.8 ± 0.5 | 48.3 ± 0.3 | 20.5 ± 0.3 | 2.3 ± 0.1 | 0.1 ± 0.1 | 81.8 | 13.8 | 39.5 | 16.8 | 1.9 | 0.1 |
Chlorite-delignification | 11.5 ± 0.5 | 43.8 ± 0.5 | 25.1 ± 0.7 | 2.8 ± 0.1 | 2.4 ± 0.4 | 85.7 | 9.9 | 37.6 | 21.5 | 2.4 | 2.1 |