Table 4.
The factors and factor level setting of the Box–Behnken design (BBD).
| Coding Level | Pressure (X1, MPa) | Flow (X2, L/h) | Temperature (X3, °C) | Time (X4, min) |
|---|---|---|---|---|
| −1 | 15 | 50 | 32 | 30 |
| 0 | 25 | 75 | 47 | 90 |
| +1 | 35 | 100 | 62 | 150 |
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