Table 1 Box–Behnken experimental design, representing the response of biodiesel yield as influenced by methanol, NaOH, temperature and time
From: Production and statistical optimization of biodiesel from kitchen chimney dump lard
Run order | Methanol | NaOH | Temperature | Time | Yield | Predicted yield |
|---|---|---|---|---|---|---|
1 | 0 | −1 | 0 | 1 | 80 | 81.179 |
2 | 0 | 1 | 0 | −1 | 75 | 75.647 |
3 | 0 | 0 | 0 | 0 | 83 | 84.202 |
4 | 0 | 0 | −1 | −1 | 84 | 83.904 |
5 | 1 | 1 | 0 | 0 | 81 | 81.772 |
6 | 0 | 0 | −1 | 1 | 85 | 86.571 |
7 | 1 | 0 | 0 | −1 | 80 | 78.821 |
8 | −1 | 1 | 0 | 0 | 75 | 73.396 |
9 | 0 | 1 | 0 | 1 | 79 | 79.314 |
10 | −1 | 0 | −1 | 0 | 84 | 85.648 |
11 | 1 | −1 | 0 | 0 | 84 | 81.733 |
12 | 0 | 0 | 0 | 0 | 82 | 84.202 |
13 | 0 | −1 | 1 | 0 | 95 | 94.083 |
14 | −1 | 0 | 1 | 0 | 87 | 87.424 |
15 | 0 | 1 | −1 | 0 | 84 | 83.355 |
16 | 0 | −1 | −1 | 0 | 95 | 89.316 |
17 | −1 | 0 | 0 | −1 | 89 | 89.349 |
18 | 1 | 0 | −1 | 0 | 78 | 81.206 |
19 | 0 | 1 | 1 | 0 | 80 | 79.313 |
20 | 0 | 0 | 0 | 0 | 84 | 84.202 |
21 | 1 | 0 | 1 | 0 | 82 | 83.982 |
22 | 1 | 0 | 0 | 1 | 85 | 82.487 |
23 | 0 | 0 | 1 | 1 | 79 | 79.433 |
24 | 0 | −1 | 0 | −1 | 93 | 94.513 |
25 | −1 | −1 | 0 | 0 | 94 | 94.166 |
26 | −1 | 0 | 0 | 1 | 77 | 76.016 |
27 | 0 | 0 | 1 | −1 | 93 | 91.766 |