Table 6.
Levels and codes of factors chosen for experiment.
| Level | Factors | ||
|---|---|---|---|
| Extraction Temperature (°C) | IL Concentration (mmol/L) | Solid-Liquid Ratio (g/mL) | |
| −1 | 40 | 0.4 | 1:9 |
| 0 | 50 | 0.6 | 1:11 |
| 1 | 60 | 0.8 | 1:13 |
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