Table 1
Matrix of real and coded variables of the centred composite plane of organosolv pre-treatment.
| Experience | Coded variables |
Real variables |
||||
|---|---|---|---|---|---|---|
| Temperature | Time | Concentration of ethanol | Temperature (°C) | Time (min) | Concentration of ethanol (50% v/v) | |
| 1 | 0 | 0 | 0 | 190 | 35 | 50 |
| 2 | 0 | 0 | 0 | 190 | 35 | 50 |
| 3 | 0 | 0 | 0 | 190 | 35 | 50 |
| 4 | 0 | 0 | 0 | 190 | 35 | 50 |
| 5 | −1 | −1 | −1 | 190 | 20 | 30 |
| 6 | 1 | −1 | −1 | 210 | 20 | 30 |
| 7 | −1 | 1 | −1 | 170 | 50 | 30 |
| 8 | 1 | 1 | −1 | 210 | 50 | 30 |
| 9 | −1 | −1 | 1 | 170 | 20 | 70 |
| 10 | 1 | −1 | 1 | 210 | 20 | 70 |
| 11 | −1 | 1 | 1 | 170 | 50 | 70 |
| 12 | 1 | 1 | 1 | 210 | 50 | 70 |
| 13 | 1.41 | 0 | 0 | 218.2 | 35 | 50 |
| 14 | −1.41 | 0 | 0 | 161.8 | 35 | 50 |
| 15 | 0 | 1.41 | 0 | 161.8 | 56.15 | 50 |
| 16 | 0 | −1.41 | 0 | 190 | 13.85 | 50 |
| 17 | 0 | 0 | 1.41 | 190 | 35 | 78.2 |
| 18 | 0 | 0 | −1.41 | 190 | 35 | 21.8 |