Table 2.
Factors and levels of response surface analysis.
| Levels | Independent Variables | ||
|---|---|---|---|
| A (HBD–HBA Molar Ratio) | B (Liquid–Solid Ratio, mL/g) | C (Temperature, ℃) | |
| −1 | 1 | 20 | 25 |
| 0 | 3 | 50 | 50 |
| 1 | 5 | 80 | 75 |
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