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Experimental range and levels of the independent variables in terms of actual and coded factors in the optimization of conditions of hydrolysis reaction
| Independent variable | Symbol | Level | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Water material ratio | X 1 | 8 | 10 | 12 |
| Hydrolysis temperature | X 2 | 35 | 40 | 45 |
| Pretreatment temperature (°C) | X 3 | 100 | 110 | 120 |
| Pretreatment time | X 4 | 5 | 10 | 15 |
