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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)
  1. Standard deviations are shown in parentheses.