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| coded
level |
||||||
|---|---|---|---|---|---|---|
| process | independent variable | –1.682 | –1 | 0 | +1 | +1.682 |
| first step | M1: methanol (vol %) | 19.8 | 30.0 | 45.0 | 60.0 | 70.2 |
| S1: sulfuric acid (vol %) | 0.8 | 2.5 | 5 | 7.5 | 9.2 | |
| L1: length of ultrasound clamp (mm) | 100 | 200 | 400 | 600 | 700 | |
| second step | M2: methanol (vol %) | 26.4 | 40 | 60 | 80 | 93.6 |
| S2: sulfuric acid (vol %) | 0.6 | 2 | 4 | 6 | 7.4 | |
| L2: length of ultrasound clamp (mm) | 100 | 200 | 400 | 600 | 700 | |
