Table 3 Quadratic rotation-regressive design of steam explosion pretreatment and hemicellulose fractionation yield under different pretreatment conditions
From: Multilevel composition fractionation process for high-value utilization of wheat straw cellulose
Test number | Pressure x 1(MPa) | Time x 2(minutes) | Fractionation yield of hemicellulose (%) |
|---|---|---|---|
1 | 1 (2.0) | 1 (6) | 60.3 (1.7) |
2 | -1 (1.0) | 1 | 58.3 (1.4) |
3 | 1 | -1 (2) | 63.2 (1.1) |
4 | -1 | -1 | 56.3 (2.3) |
5 | 0 (1.5) | 1.414 (6.828) | 72.7 (1.2) |
6 | 0 | -1.414 (1.172) | 52.4 (1.6) |
7 | 1.414 (2.207) | 0 (4) | 63.5 (2.1) |
8 | -1.414 (0.793) | 0 | 55.1 (1.8) |
9 | 0 | 0 | 67.1 (1.6) |
10 | 0 | 0 | 67.5 (1.3) |
11 | 0 | 0 | 67.1 (1.2) |
12 | 0 | 0 | 67.4 (1.4) |
13 | 0 | 0 | 67.2 (1.5) |