Table 2.
The CCD-RSM design for optimizing hydrolysis conditions.
| Run number | Code level of variables |
Response value Y (%) | Type of point | |||
|---|---|---|---|---|---|---|
| x1 (X1) | x2 (X2) | x3 (X3) | x4 (X4) | |||
| 1 | 60 (−1) | 8.5 (−1) | 5 (−1) | 0.2 (−1) | 37.36 | Factorial |
| 2 | 70 (+1) | 8.5 (−1) | 5 (−1) | 0.2 (−1) | 47.63 | Factorial |
| 3 | 60 (−1) | 10.5 (+1) | 5 (−1) | 0.2 (−1) | 50.8 | Factorial |
| 4 | 70 (+1) | 10.5 (+1) | 5 (−1) | 0.2 (−1) | 45.02 | Factorial |
| 5 | 60 (−1) | 8.5 (−1) | 6 (+1) | 0.2 (−1) | 39.69 | Factorial |
| 6 | 70 (+1) | 8.5 (−1) | 6 (+1) | 0.2 (−1) | 52.62 | Factorial |
| 7 | 60 (−1) | 10.5 (+1) | 6 (+1) | 0.2 (−1) | 59.69 | Factorial |
| 8 | 70 (+1) | 10.5 (+1) | 6 (+1) | 0.2 (−1) | 56.66 | Factorial |
| 9 | 60 (−1) | 8.5 (−1) | 5 (−1) | 0.4 (+1) | 38.53 | Factorial |
| 10 | 70 (+1) | 8.5 (−1) | 5 (−1) | 0.4 (+1) | 49.46 | Factorial |
| 11 | 60 (−1) | 10.5 (+1) | 5 (−1) | 0.4 (+1) | 56.26 | Factorial |
| 12 | 70 (+1) | 10.5 (+1) | 5 (−1) | 0.4 (+1) | 49.67 | Factorial |
| 13 | 60 (−1) | 8.5 (−1) | 6 (+1) | 0.4 (+1) | 38.46 | Factorial |
| 14 | 70 (+1) | 8.5 (−1) | 6 (+1) | 0.4 (+1) | 53.75 | Factorial |
| 15 | 60 (−1) | 10.5 (+1) | 6 (+1) | 0.4 (+1) | 59.28 | Factorial |
| 16 | 70 (+1) | 10.5 (+1) | 6 (+1) | 0.4 (+1) | 57.08 | Factorial |
| 17 | 55 (−α) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 44.29 | Axial |
| 18 | 75 (+α) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 52.25 | Axial |
| 19 | 65 (0) | 7.5 (−α) | 5.5 (0) | 0.3 (0) | 31.84 | Axial |
| 20 | 65 (0) | 11.5 (+α) | 5.5 (0) | 0.3 (0) | 51.58 | Axial |
| 21 | 65 (0) | 9.5 (0) | 4.5 (−α) | 0.3 (0) | 50.13 | Axial |
| 22 | 65 (0) | 9.5 (0) | 6.5 (+α) | 0.3 (0) | 62.15 | Axial |
| 23 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.1 (−α) | 50.77 | Axial |
| 24 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.5 (+α) | 53.68 | Axial |
| 25 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 62.05 | Center |
| 26 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 62.65 | Center |
| 27 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 63.33 | Center |
| 28 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 61.65 | Center |
| 29 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 63.78 | Center |
| 30 | 65 (0) | 9.5 (0) | 5.5 (0) | 0.3 (0) | 62.65 | Center |
Abbreviations: CCD, central composite design; RSM, response surface methodology; x, the actual level of variables; X, the code level of variables.