Table 6.
Analysis of variance for the experimental results of the Box-Behinken design matrix for JFB yield.
| Source | DF | Adj SS | Adj MS | F-Value | P-Value | remarks |
|---|---|---|---|---|---|---|
| Model | 9 | 23.9034 | 2.6559 | 39.96 | 0.000 | Highly significant |
| Linear | 3 | 1.3910 | 0.4637 | 6.98 | 0.031 | Significant |
| Methanol | 1 | 0.9853 | 0.9853 | 14.82 | 0.012 | Highly significant |
| NaOH | 1 | 0.0263 | 0.0263 | 0.40 | 0.557 | Not significant |
| Temperature (°C) | 1 | 0.4050 | 0.4050 | 6.09 | 0.057 | Not significant |
| Square | 3 | 10.6944 | 3.5648 | 53.63 | 0.000 | Highlysignificant |
| Methanol × Methanol | 1 | 8.7170 | 8.7170 | 131.15 | 0.000 | Highly significant |
| NaOH × NaOH | 1 | 3.8555 | 3.8555 | 58.01 | 0.001 | Highly significant |
| Temperature (°C) × Temperature (°C) | 1 | 0.0937 | 0.0937 | 1.41 | 0.288 | Not significant |
| 2-Way Interaction | 3 | 12.0229 | 4.0076 | 60.30 | 0.000 | Highly significant |
| Methanol × NaOH | 1 | 11.0760 | 11.0760 | 166.64 | 0.000 | Highly significant |
| Methanol × Temperature (°C) | 1 | 0.0156 | 0.0156 | 0.24 | 0.648 | Not significant |
| NaOH × Temperature (°C) | 1 | 0.9312 | 0.9312 | 14.01 | 0.013 | Highly significant |
| Error | 5 | 0.3323 | 0.0665 | |||
| Lack-of-Fit | 3 | 0.3323 | 0.1108 | * | * | |
| Pure Error | 2 | 0.0000 | 0.0000 | |||
| Total | 14 | 24.2358 |
Regression analysis was undertaken for fitting the response function and predicting the biodiesel yield was obtained in eq. (3).