Table 2.
Design and results of the steepest ascent and Box-Behnken experiments.
| Run | CaCl2 (mol/L) | Urea (g/l) | Temperature (°C) | CaCO3 (g/l) | |
|---|---|---|---|---|---|
| Steepest ascent experiment | 1 | 0.5 | 40 | 35 | 44.46 |
| 2 | 0.6 | 42 | 37 | 51.72 | |
| 3 | 0.7 | 44 | 39 | 66.26 | |
| 4 | 0.8 | 46 | 41 | 65.98 | |
| 5 | 0.9 | 48 | 43 | 66.46 | |
| 6 | 1.0 | 50 | 45 | 66.34 | |
| Box-Behnken experiment | 1 | 0.5(-1) | 40(-1) | 39(0) | 44.18 |
| 2 | 0.5(-1) | 48(1) | 39(0) | 47.4 | |
| 3 | 0.9(1) | 40(-1) | 39(0) | 62.16 | |
| 4 | 0.9(1) | 48(1) | 39(0) | 66.7 | |
| 5 | 0.7(0) | 40(-1) | 35(-1) | 51.96 | |
| 6 | 0.7(0) | 40(-1) | 43(1) | 61.78 | |
| 7 | 0.7(0) | 48(1) | 35(-1) | 56.62 | |
| 8 | 0.7(0) | 48(1) | 43(1) | 66.48 | |
| 9 | 0.5(-1) | 44(0) | 35(-1) | 40.92 | |
| 10 | 0.9(1) | 44(0) | 35(-1) | 56.28 | |
| 11 | 0.5(-1) | 44(0) | 43(1) | 47.02 | |
| 12 | 0.9(1) | 44(0) | 43(1) | 66.54 | |
| 13 | 0.7(0) | 44(0) | 39(0) | 66.62 | |
| 14 | 0.7(0) | 44(0) | 39(0) | 66.18 | |
| 15 | 0.7(0) | 44(0) | 39(0) | 65.96 |