Table 2.
The 23 factorial experimental design.
| Parameters | − 1 | 0 | + 1 |
|---|---|---|---|
| A: NaOH dosage (%) | 5 | 7.5 | 10 |
| B: Enzyme dosage (%) | 0.2 | 2.1 | 4 |
| C: Refining time (h) | 1 | 1.5 | 2 |
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