Open Access
Table 1
Independent factor level settings for a biodiesel production process.
| Factors | Coded symbols | Units | Levels |
||
|---|---|---|---|---|---|
| −1 | 0 | +1 | |||
| Ethanol–oil molar ratio | x1 | Molar relation | 6 | 12 | 18 |
| KOH concentration | x2 | %w/w | 1 | 2 | 3 |
| Stirring speed | x3 | rpm | 200 | 300 | 400 |
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