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Table 5 Design of orthogonal experiment (L16 (4 3 )) for ethanol extraction of steam-exploded wheat straw and lignin fractionation yield under different conditions

From: Multilevel composition fractionation process for high-value utilization of wheat straw cellulose

Test number Ethanol concentration X 1(%) Temperature X 2(°C) Time X 3(minutes) Fractionation yield of lignin (%)
1 45 120 60 75.4 (1.3)
2 45 140 120 78.7 (2.1)
3 45 160 150 83.5 (1.6)
4 45 180 90 75.8 (2.1)
5 60 120 90 77.4 (2.3)
6 60 140 150 76.7 (1.8)
7 60 160 120 88.4 (1.6)
8 60 180 60 80.3 (1.2)
9 75 120 120 82.9 (2.4)
10 75 140 60 74.9 (1.6)
11 75 160 90 81.4 (1.9)
12 75 180 150 77.5 (1.5)
13 90 120 150 78.4 (2.1)
14 90 140 90 82.5 (2.0)
15 90 160 60 83.8 (2.3)
16 90 180 120 85.3 (1.1)
  1. Standard deviations are shown in parentheses.