Table 1.
Independent variables and their levels used in the response surface design
| Independent variables | Coded levels | ||
|---|---|---|---|
| −1 | 0 | 1 | |
| X1: Pressure (bar) | 150 | 250 | 350 |
| X2: Temperature (°C) | 40 | 50 | 60 |
| X3: Solvent: material ratio | 100 | 150 | 200 |
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