Research Article
Optimization of Conversion of High Free Fatty Acid Jatropha curcas Oil to Biodiesel Using Response Surface Methodology
Table 3
ANOVA for response surface quadratic model.
| | Source | Sum of squares | Degree of freedom (df) | Mean square | value | value
prob > |
| | Model | 2078.70 | 14 | 148.48
| 47.43 | <0.0001 | | : catalyst concentration | 815.10
| 1 | 815.10
| 260.35
| <0.0001 | | : temperature | 6.75
| 1 | 6.75
| 2.16 | 0.1500
| | : time | 520.08
| 1 | 520.08
| 166.12
| <0.0001 | | : methanol/oil molar ratio | 53.76
| 1 | 53.76
| 17.17 | 0.0002
| | 172.05
| 1 | 172.05
| 54.95 | <0.0001
| | 13.78
| 1 | 13.78
| 4.40 | 0.0424
| | 6.13
| 1 | 6.13
| 1.96 | 0.1698
| | 5.78
| 1 | 5.78
| 1.85 | 0.1820
| | 108.78
| 1 | 108.78
| 34.75 | <0.0001 | | 162.90
| 1 | 162.90
| 52.03 | <0.0001 | | 4.19
| 1 | 4.19
| 1.34 | 0.2541
| | 149.83
| 1 | 149.83
| 47.86 | <0.0001 | | 28.97
| 1 | 28.97
| 9.25 | 0.0042
| | 0.0001157
| 1 | 0.0001157
| 0.00003697
| 0.9848 | | Residual | 122.10
| 39 | 3.13 | | |
|
|
CV: 2.09%, : 0.945, : 0.923, and predicted : 0.890.
|
