Table 1.
Box-Behnken response surface design with actual and (coded) values of operating parameters related to application of a continuous-flow FLC-dc-APGD reaction discharge system for the production of NH4NO3-based PALs having certain electrical conductivity measured after 1 (σ1h) and 24 h (σ24h).
| Order | A, mL min−1 | B, mA | C, % | σ 1h, mS cm−1 |
σ 24h, mS cm−1 |
|
|---|---|---|---|---|---|---|
| Standard | Run | |||||
| 11 | 1 | 6.0 (+1) | 40 (0) | 0.1 (−1) | 2.230 | 2.310 |
| 5 | 2 | 2.0 (−1) | 30 (−1) | 0.3 (0) | 5.180 | 5.230 |
| 13 | 3 a | 4.0 (0) | 40 (0) | 0.3 (0) | 5.000 | 5.200 |
| 7 | 4 | 6.0 (+1) | 30 (−1) | 0.3 (0) | 4.810 | 5.060 |
| 4 | 5 | 4.0 (0) | 50 (+1) | 0.5 (+1) | 7.960 | 8.090 |
| 2 | 6 | 4.0 (0) | 50 (+1) | 0.1 (−1) | 2.240 | 2.260 |
| 15 | 7 a | 4.0 (0) | 40 (0) | 0.3 (0) | 5.130 | 5.270 |
| 3 | 8 | 4.0 (0) | 30 (−1) | 0.5 (+1) | 7.800 | 7.880 |
| 10 | 9 | 2.0 (−1) | 40 (0) | 0.5 (+1) | 8.400 | 8.820 |
| 6 | 10 | 2.0 (−1) | 50 (+1) | 0.3 (0) | 5.120 | 5.170 |
| 8 | 11 | 6.0 (+1) | 50 (+1) | 0.3 (0) | 5.320 | 5.340 |
| 12 | 12 | 6.0 (+1) | 40 (0) | 0.5 (+1) | 7.510 | 7.880 |
| 9 | 13 | 2.0 (−1) | 40 (0) | 0.1 (−1) | 2.230 | 2.270 |
| 14 | 14 a | 4.0 (0) | 40 (0) | 0.3 (0) | 5.240 | 5.300 |
| 1 | 15 | 4.0 (0) | 30 (−1) | 0.1 (−1) | 2.100 | 2.120 |
A: The flow rate of the FLC solution (NH4NO3) (in mL min−1). B: The discharge current of the FLC-dc-APGD system (in mA). C: The NH4NO3 concentration in the FLC solution (in %). a Center points at A = 4.0 mL min−1 (0), B = 40 mA (0), C = 0.3% (0).