Table 3.
Factors Level in RSM experiment.
| Independent Variable | Factor Level | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| Ultrasonic temperature (°C) | 30 | 40 | 50 |
| Methanol concentration (%) | 10 | 20 | 30 |
| The liquid-solid ratio (mL/g) | 10:1 | 15:1 | 20:1 |
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